Linux kernel does not properly save or restore EFLAGS during a context switch, or reset the flags when creating new threads, which allows local users to cause a denial of service (process crash), as demonstrated using a process that sets the Alignment Check flag (EFLAGS 0x40000), which triggers a SIGBUS in other processes that have an unaligned access.

This kernel update fixes the following security problems :

  - A bug within the UDF filesystem that caused machine     hangs when truncating files on the filesystem was fixed.
    [#186226]. (CVE-2006-4145)

  - A potential crash when receiving IPX packets was fixed.
    This problem is thought not to be exploitable. [#197809]

  - A problem in DVB packet handling could be used to crash     the machine when receiving DVB net packages is active.
    [#201429]. (CVE-2006-4623)

  - A struct file leak was fixed in the perfmon(2) system     call on the Itanium architecture. [#202269].
    (CVE-2006-3741)

  - A malformed ELF image can be used on the Itanium     architecture to trigger a kernel crash (denial of     service) when a local attacker can supply it to be     started. [#203822]. (CVE-2006-4538)

  - A problem in the ATM protocol handling clip_mkip     function could be used by remote attackers to     potentially crash the machine. [#205383].
    (CVE-2006-4997)

CVE-2006-5757/

  - A problem in the grow_buffers function could be used to     crash or hang the machine using a corrupted filesystem.
    This affects filesystem types ISO9660 and NTFS.
    [#205384]. (CVE-2006-6060)

  - On the i386 architecture the ELFAGS content was not     correctly saved, which could be used by local attackers     to crash other programs using the AC and NT flag or to     escalate privileges by waiting for iopl privileges to be     leaked. [#209386]. (CVE-2006-5173)

  - On the S/390 architecture copy_from_user() could be used     by local attackers to read kernel memory. [#209880].
    (CVE-2006-5174)

  - A problem in IPv6 flowlabel handling can be used by     local attackers to hang the machine. [#216590].
    (CVE-2006-5619)

  - On the PowerPC architecture a syscall has been wired     without the proper futex implementation that can be     exploited by a local attacker to hang the machine.
    [#217295]. (CVE-2006-5648)

  - On the PowerPC architecture the proper futex     implementation was missing a fix for alignment check     which could be used by a local attacker to crash the     machine. [#217295]. (CVE-2006-5649)

  - A problem in cramfs could be used to crash the machine     during mounting a crafted cramfs image. This requires an     attacker to supply such a crafted image and have a user     mount it. [#218237]. (CVE-2006-5823)

  - A problem in the ext3 filesystem could be used by     attackers able to supply a crafted ext3 image to cause a     denial of service or further data corruption if a user     mounts this image. [#220288]. (CVE-2006-6053)

  - Missing return code checking in the HFS could be used to     crash machine when a user complicit attacker is able to     supply a specially crafted HFS image. [#221230].
    (CVE-2006-6056)

  - Multiple unspecified vulnerabilities in netfilter for     IPv6 code allow remote attackers to bypass intended     restrictions via fragmentation attack vectors, aka (1)     'ip6_tables protocol bypass bug' and (2) 'ip6_tables     extension header bypass bug'. [#221313]. (CVE-2006-4572)

  - An integer overflow in the networking bridge ioctl     starting with Kernel 2.6.7 could be used by local     attackers to overflow kernel memory buffers and     potentially escalate privileges [#222656].
    (CVE-2006-5751)

and the following non security bugs :

  - patches.fixes/dm-bio_list_merge-fix.diff: device-mapper     snapshot: bio_list fix [#117435]

  - patches.fixes/statd-refcount-fix: Fix refcounting     problems in host management in lockd. [#148009]

  - patches.fixes/i8042-reentry: Prevents i8042_interrupt()     from being reentered. [#167187]

  - patches.suse/bonding-workqueue: Replace system timer     with work queue in monitor functions. Remove rtnl_lock     calls in monitor functions added in original version.
    [#174843] [#205196]

  - patches.arch/i386-profile-pc: i386: Account spinlocks to     the caller during profiling for !FP kernels [#176770]

  - patches.arch/add-user-mode: i386/x86-64: Add user_mode     checks to profile_pc for oprofile [#176770]

  - patches.drivers/aic7xxx-max-sectors-adjust: Adjust     .max_sectors to 8192 for aic7xxx [#177059]

  - patches.xen/xen-x86-dcr-fallback: Add fallback when     XENMEM_exchange fails to replace contiguous region     [#181869]

  - patches.suse/lkcd-support-large-minor-number: LKCD     should support minor numbers > 256 [#185125]

  - patches.fixes/scsi-scan-limit-luns-seqscan-16k: Limit     sequential scan to 16k LUNs [#185164]

  - patches.drivers/powernow-ext-mask: Handle extended     powernow vid mask properly [#185654]

  - patches.fixes/xfs-unlink-recovery-fix: [XFS] unlink     recovery fix. ([#185796]

  - patches.suse/lkcd-dont-lose-one-page: Fix incorrect     dumps on machines with memory holes [#186169]

  - patches.fixes/ieee80211-orinoco_ap_workaround.diff:
    ieee80211: workaround for broken Orinoco access points     [#186879]

  - patches.fixes/sched-group-exclusive: Fix scheduler crash     with exclusive cpusets [#188921]

  - patches.fixes/bdev-imapping-race.diff: Fix race between     sync_single_inode() and iput() [#188950]

  - patches.fixes/scsi-scan-blist-update: Update blacklist     entries for EMC Symmetrix and HP EVA [#191648]

  - patches.arch/ia64-mce-output: Save/restore     oops_in_progress around printing machine checks     [#191901]

  - patches.fixes/scsi-add-device-oops-during-eh: Fix Oops     in scsi_add_device during EH [#195050]

  - Included a set of fixes for [#195940]

  - patches.fixes/dm-fix-alloc_dev-error_path.patch: call     free_minor in alloc_dev error path.
    patches.fixes/dm-snapshot-fix-origin_write-pe-submission     .patch: fix origin_write pending_exception submission. -

patches.fixes/dm-snapshot-replace-sibling-list.patch: replace sibling list.

  - patches.fixes/dm-snapshot-fix-pending-pe-ref.patch: fix     references to pending pe.

  - patches.fixes/dm-snapshot-fix-invalidation.patch: fix     invalidation. -

patches.fixes/dm-kcopyd-error-accumulation-fix.patch: kcopyd should accumulate errors.
patches.fixes/dm-snapshot-fix-metadata-error-handling.patch: fix read_metadata error handling.
patches.fixes/dm-snapshot-fix-metadata-writing-when-suspending.patch:
fix metadata writing when suspending.

  - patches.fixes/nat-t-pskb-pull.patch: Fix NAT-T VPN with     certain ethernet chips, in particular recent e1000     chips. [#196747]

  - patches.drivers/e1000-update: Update so that we no     longer break the 'Disable Packet Split for PCI express     adapters' driver option.

  - patches.fixes/e1000-no-packet-split: Discard, no longer     needed.

  - patches.arch/acpi_T60_ultrabay.patch: Add T60 ACPI dock     station path to ibm_acpi module [#196884]

  - patches.fixes/acpi_battery_hotplug_fix.patch: Workaround     ACPI misdesign to recon dock station when booting     undocked.

  - patches.fixes/acpi_ibm_dock_fix_not_present.patch:
    Workaround ACPI misdesign to recon dock station when     booting undocked [#196884]

  - patches.arch/x86_64-monotonic-clock: Fix monotonic clock     on x86-64 [#197548]

  - patches.fixes/nfs-truncate-race: Fix a race when     truncating over NFS and writing via mmap [#198023]

  - patches.drivers/libata-no-spindown-on-shutdown: Don't     spindown SCSI disks when rebooting [#198687]

  - patches.drivers/qla2xxx-reset-fix: allow reset for     qla2xxx via sg_reset [#200325]

  - kabi/s390/symvers-default: Update kABI symbols [#202134]

  - patches.suse/bond_alb_deadlock_fix: bonding: fix     deadlock on high loads in bond_alb_monitor(). [#202512]

  - patches.arch/i386-fix-tsc-selection: Fix TSC timer     selection on i386 [#203713]

  - patches.drivers/aic94xx-remove-flash-manfid-reliance:
    Remove reliance on the FLASH MANFID [#203768]

  - patches.fixes/xfs-kern-205110-xfs_dio_locking: Fix ABBA     deadlock between i_mutex and iolock [#205110]

  - patches.suse/bonding-workqueue: Replace system timer     with work queue in monitor functions. Remove rtnl_lock     calls in monitor functions added in original version.
    [#174843] [#205196]

  - add     patches.fixes/fix-incorrect-hugepage-interleaving.patch     fix NUMA interleaving for huge pages [#205268]

  - patches.suse/bondalb-hashtbl.patch: fix hang in bonding     ALB driver. [#206629]     patches.drivers/usb-add-raritan-kvm-usb-dongle-to-the-hi     d_quirk_noget-blacklist.patch: USB: add Raritan KVM USB     Dongle to the HID_QUIRK_NOGET blacklist [#206932]

  - patches.arch/ia64-mca_asm-set_kernel_registers: [IA64]     set ar.fpsr on MCA/INIT kernel entry. [#206967]

  - patches.fixes/md-bitmap-ffz: Use ffz instead of     find_first_set to convert multiplier to shift. [#207679]

  - patches.fixes/md-bitmap-compat-ioctl: Allow     SET_BITMAP_FILE to work on 64bit kernel with 32bit     userspace. [#207688]

  - patches.drivers/mpt-rport-stall: Fix MPT oops during     aborting commands [#207768]

  - patches.drivers/libata-jmicron-update: Fix handling of     JMicron controller [#207939]

  - patches.arch/i386-mmconfig-flush:
    arch/i386/pci/mmconfig.c tlb flush fix [#208414]

  - patches.fixes/scsi-fix-req-page-count: scsi_lib.c:
    properly count the number of pages in scsi_req_map_sg()     [#208782]

  - patches.fixes/fix-processor-placement.diff: sched: Fix     longstanding load balancing bug in the scheduler     [#209460].

  - patches.arch/x86_64-fpu-corruption: Fix FPU corruption     [#209903]

  - patches.drivers/qla1280-bus-reset-handling: performance     slowdown after bus reset on qla12160 HBA [#213717]

  - patches.drivers/qla1280-scb-timeout: qla1280 times out     on long operations such as tape rewind [#214695]

  - patches.fixes/slab-per-cpu-data: Make slab     initialization use per cpu data of correction CPU     [#216316]

  - patches.fixes/ocfs2-network-send-lock.diff: ocfs2:
    introduce sc->sc_send_lock to protect outbound network     messages [#216912]

  - marked module megaraid_sas as supported

  - marked module jsm as supported [#218969]

  - patches.suse/ocfs2-13-fix-quorum-work.diff: ocfs2:
    outstanding scheduled work can oops when quorum is shut     down [#220694]

  - patches.xen/xen-x86_64-agp: add missing header [#222174]     [#224170]

  - patches.fixes/md-rebuild-fix: md: Fix bug where a     rebuild of spares, when interrupted by a rebuild,     doesn't always get properly completed once the system is     back up, leading to filesystem corruption. [#224960].

  - patches.fixes/scsi-sdev-initialisation-block-race: SCSI     midlayer race: scan vs block/unblock deadlocks sdev     [#225770]

Mark Dowd discovered that the netfilter iptables module did not correcly handle fragmented packets. By sending specially crafted packets, a remote attacker could exploit this to bypass firewall rules. This has only be fixed for Ubuntu 6.10; the corresponding fix for Ubuntu 5.10 and 6.06 will follow soon. (CVE-2006-4572)

Dmitriy Monakhov discovered an information leak in the
__block_prepare_write() function. During error recovery, this function did not properly clear memory buffers which could allow local users to read portions of unlinked files. This only affects Ubuntu 5.10.
(CVE-2006-4813)

ADLab Venustech Info Ltd discovered that the ATM network driver referenced an already released pointer in some circumstances. By sending specially crafted packets to a host over ATM, a remote attacker could exploit this to crash that host. This does not affect Ubuntu 6.10. (CVE-2006-4997)

Matthias Andree discovered that the NFS locking management daemon (lockd) did not correctly handle mixing of 'lock' and 'nolock' option mounts on the same client. A remote attacker could exploit this to crash lockd and thus rendering the NFS imports inaccessible. This only affects Ubuntu 5.10. (CVE-2006-5158)

The task switching code did not save and restore EFLAGS of processes.
By starting a specially crafted executable, a local attacker could exploit this to eventually crash many other running processes. This does not affect Ubuntu 6.10. (CVE-2006-5173)

James Morris discovered that the ip6fl_get_n() function incorrectly handled flow labels. A local attacker could exploit this to crash the kernel. (CVE-2006-5619)

Fabio Massimo Di Nitto discovered that the sys_get_robust_list and sys_set_robust_list system calls lacked proper lock handling on the powerpc platform. A local attacker could exploit this to create unkillable processes, drain all available CPU/memory, and render the machine unrebootable. This only affects Ubuntu 6.10. (CVE-2006-5648)

Fabio Massimo Di Nitto discovered a flaw in the alignment check exception handling on the powerpc platform. A local attacker could exploit this to cause a kernel panic and crash the machine.
(CVE-2006-5649)

Certain corrupted squashfs file system images caused a memory allocation to be freed twice. By mounting a specially crafted squashfs file system, a local attacker could exploit this to crash the kernel.
This does not affect Ubuntu 5.10. (CVE-2006-5701)

An integer overflow was found in the get_fdb_entries() function of the network bridging code. By executing a specially crafted ioctl, a local attacker could exploit this to execute arbitrary code with root privileges. (CVE-2006-5751).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This kernel update fixes the following security problems :

  - CVE-2006-4145: A bug within the UDF filesystem that     caused machine hangs when truncating files on the     filesystem was fixed. [#186226]

    - A potential crash when receiving IPX packets was       fixed. This problem is thought not to be exploitable.
      [#197809]

  - CVE-2006-4623: A problem in DVB packet handling could be     used to crash the machine when receiving DVB net     packages is active. [#201429]

  - CVE-2006-3741: A struct file leak was fixed in the     perfmon(2) system call on the Itanium architecture.
    [#202269]

  - CVE-2006-4538: A malformed ELF image can be used on the     Itanium architecture to trigger a kernel crash (denial     of service) when a local attacker can supply it to be     started. [#203822]

  - CVE-2006-4997: A problem in the ATM protocol handling     clip_mkip function could be used by remote attackers to     potentially crash the machine. [#205383]

CVE-2006-5757/

  - CVE-2006-6060: A problem in the grow_buffers function     could be used to crash or hang the machine using a     corrupted filesystem. This affects filesystem types     ISO9660 and NTFS. [#205384]

  - CVE-2006-5173: On the i386 architecture the ELFAGS     content was not correctly saved, which could be used by     local attackers to crash other programs using the AC and     NT flag or to escalate privileges by waiting for iopl     privileges to be leaked. [#209386]

  - CVE-2006-5174: On the S/390 architecture     copy_from_user() could be used by local attackers to     read kernel memory. [#209880]

  - CVE-2006-5619: A problem in IPv6 flowlabel handling can     be used by local attackers to hang the machine.
    [#216590]

  - CVE-2006-5648: On the PowerPC architecture a syscall has     been wired without the proper futex implementation that     can be exploited by a local attacker to hang the     machine. [#217295]

  - CVE-2006-5649: On the PowerPC architecture the proper     futex implementation was missing a fix for alignment     check which could be used by a local attacker to crash     the machine. [#217295]

  - CVE-2006-5823: A problem in cramfs could be used to     crash the machine during mounting a crafted cramfs     image. This requires an attacker to supply such a     crafted image and have a user mount it. [#218237]

  - CVE-2006-6053: A problem in the ext3 filesystem could be     used by attackers able to supply a crafted ext3 image to     cause a denial of service or further data corruption if     a user mounts this image. [#220288]

  - CVE-2006-6056: Missing return code checking in the HFS     could be used to crash machine when a user complicit     attacker is able to supply a specially crafted HFS     image. [#221230]

  - CVE-2006-4572: Multiple unspecified vulnerabilities in     netfilter for IPv6 code allow remote attackers to bypass     intended restrictions via fragmentation attack vectors,     aka (1) 'ip6_tables protocol bypass bug' and (2)     'ip6_tables extension header bypass bug'. [#221313]

  - CVE-2006-5751: An integer overflow in the networking     bridge ioctl starting with Kernel 2.6.7 could be used by     local attackers to overflow kernel memory buffers and     potentially escalate privileges [#222656]

Additionaly this kernel catches up to the SLE 10 state of the kernel, with massive additional fixes.

Some vulnerabilities were discovered and corrected in the Linux 2.6 kernel :

The Linux kernel does not properly save or restore EFLAGS during a context switch, or reset the flags when creating new threads, which could allow a local user to cause a Denial of Service (process crash) (CVE-2006-5173).

The seqfile handling in the 2.6 kernel up to 2.6.18 allows local users to cause a DoS (hang or oops) via unspecified manipulations that trigger an infinite loop while searching for flowlabels (CVE-2006-5619).

An integer overflow in the 2.6 kernel prior to 2.6.18.4 could allow a local user to execute arbitrary code via a large maxnum value in an ioctl request (CVE-2006-5751).

A race condition in the ISO9660 filesystem handling could allow a local user to cause a DoS (infinite loop) by mounting a crafted ISO9660 filesystem containing malformed data structures (CVE-2006-5757).

A vulnerability in the bluetooth support could allow for overwriting internal CMTP and CAPI data structures via malformed packets (CVE-2006-6106).

The provided packages are patched to fix these vulnerabilities. All users are encouraged to upgrade to these updated kernels immediately and reboot to effect the fixes.

In addition to these security fixes, other fixes have been included such as :

  - added the marvell IDE driver - use a specific driver     Jmicron chipsets rather than using a generic one -     updated the sky2 driver to fix some network hang issues

To update your kernel, please follow the directions located at :

http://www.mandriva.com/en/security/kernelupdate

ID	Name	Product	Family	Severity
59162	SuSE 10 Security Update : Linux kernel (ZYPP Patch Number 2393)	Nessus	SuSE Local Security Checks	high
29490	SuSE 10 Security Update : Linux kernel (ZYPP Patch Number 2399)	Nessus	SuSE Local Security Checks	high
27981	Ubuntu 5.10 / 6.06 LTS / 6.10 : linux-source-2.6.12/-2.6.15/-2.6.17 vulnerabilities (USN-395-1)	Nessus	Ubuntu Local Security Checks	high
27291	openSUSE 10 Security Update : kernel (kernel-2397)	Nessus	SuSE Local Security Checks	high
24619	Mandrake Linux Security Advisory : kernel (MDKSA-2007:002)	Nessus	Mandriva Local Security Checks	high

Detections

Analytics

CVE-2006-5173

medium

Tenable Plugins

high

high

high

high

high