In the Linux kernel, the following vulnerability has been resolved: mm: cachestat: fix folio read-after-free in cache walk In cachestat, we access the folio from the page cache's xarray to compute its page offset, and check for its dirty and writeback flags. However, we do not hold a reference to the folio before performing these actions, which means the folio can concurrently be released and reused as another folio/page/slab. Get around this altogether by just using xarray's existing machinery for the folio page offsets and dirty/writeback states. This changes behavior for tmpfs files to now always report zeroes in their dirty and writeback counters. This is okay as tmpfs doesn't follow conventional writeback cache behavior: its pages get "cleaned" during swapout, after which they're no longer resident etc.

The remote Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2024:6567 advisory.

    * kernel: efivarfs: force RO when remounting if SetVariable is not supported (CVE-2023-52463)

    * kernel: nfsd: fix RELEASE_LOCKOWNER (CVE-2024-26629)

    * kernel: mm: cachestat: fix folio read-after-free in cache walk (CVE-2024-26630)

    * kernel: mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again (CVE-2024-26720)

    * kernel: Bluetooth: af_bluetooth: Fix deadlock (CVE-2024-26886)

    * kernel: kprobes/x86: Use copy_from_kernel_nofault() to read from unsafe address (CVE-2024-26946)

    * kernel: KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()     (CVE-2024-35791)

    * kernel: mm: cachestat: fix two shmem bugs (CVE-2024-35797)

    * kernel: x86/coco: Require seeding RNG with RDRAND on CoCo systems (CVE-2024-35875)

    * kernel: mm/hugetlb: fix missing hugetlb_lock for resv uncharge (CVE-2024-36000)

    * kernel: iommufd: Fix missing update of domains_itree after splitting iopt_area (CVE-2023-52801)

    * kernel: net: fix out-of-bounds access in ops_init (CVE-2024-36883)

    * kernel: regmap: maple: Fix cache corruption in regcache_maple_drop() (CVE-2024-36019)

    * kernel: usb-storage: alauda: Check whether the media is initialized (CVE-2024-38619)

    * kernel: net: bridge: mst: fix vlan use-after-free (CVE-2024-36979)

    * kernel: scsi: qedf: Ensure the copied buf is NUL terminated (CVE-2024-38559)

    * kernel: xhci: Handle TD clearing for multiple streams case (CVE-2024-40927)

    * kernel: cxl/region: Fix memregion leaks in devm_cxl_add_region() (CVE-2024-40936)

    * kernel: net/sched: Fix UAF when resolving a clash (CVE-2024-41040)

    * kernel: ppp: reject claimed-as-LCP but actually malformed packets (CVE-2024-41044)

    * kernel: mm: prevent derefencing NULL ptr in pfn_section_valid() (CVE-2024-41055)

    * kernel: PCI/MSI: Fix UAF in msi_capability_init (CVE-2024-41096)

    * kernel: xdp: Remove WARN() from __xdp_reg_mem_model() (CVE-2024-42082)

    * kernel: x86: stop playing stack games in profile_pc() (CVE-2024-42096)

    * kernel: Revert mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again     (CVE-2024-42102)

    * kernel: mm: avoid overflows in dirty throttling logic (CVE-2024-42131)

    * kernel: nvme: avoid double free special payload (CVE-2024-41073)

Tenable has extracted the preceding description block directly from the Rocky Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2024-6567 advisory.

    - usb-storage: alauda: Check whether the media is initialized (CKI Backport Bot) [RHEL-43716]     {CVE-2024-38619}
    - mm: avoid overflows in dirty throttling logic (Jay Shin) [RHEL-51848 RHEL-50004] {CVE-2024-42131}
    - Revert 'mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again' (Jay Shin) [RHEL-51701     RHEL-50004] {CVE-2024-42102}
    - mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again (Jay Shin) [RHEL-42628 RHEL-5619]     {CVE-2024-26720}
    - net: fix out-of-bounds access in ops_init (Paolo Abeni) [RHEL-43188 RHEL-46610] {CVE-2024-36883}
    - nvme: avoid double free special payload (CKI Backport Bot) [RHEL-51311] {CVE-2024-41073}
    - xhci: Handle TD clearing for multiple streams case (CKI Backport Bot) [RHEL-47894 RHEL-47892]     {CVE-2024-40927}
    - Bluetooth: af_bluetooth: Fix deadlock (Bastien Nocera) [RHEL-34161] {CVE-2024-26886}
    - xdp: Remove WARN() from __xdp_reg_mem_model() (CKI Backport Bot) [RHEL-51586] {CVE-2024-42082}
    - nfsd: fix RELEASE_LOCKOWNER (Benjamin Coddington) [RHEL-42578 RHEL-34875] {CVE-2024-26629}
    - net: bridge: mst: fix vlan use-after-free (cki-backport-bot) [RHEL-43729] {CVE-2024-36979}
    - efivarfs: force RO when remounting if SetVariable is not supported (Pavel Reichl) [RHEL-42343     RHEL-26588] {CVE-2023-52463}
    - mm: prevent derefencing NULL ptr in pfn_section_valid() (Jarod Wilson) [RHEL-51140 RHEL-51138]     {CVE-2024-41055}
    - mm, kmsan: fix infinite recursion due to RCU critical section (Jarod Wilson) [RHEL-51140 RHEL-51138]     {CVE-2024-41055}
    - ppp: reject claimed-as-LCP but actually malformed packets (CKI Backport Bot) [RHEL-51061 RHEL-51059]     {CVE-2024-41044}
    - x86: stop playing stack games in profile_pc() (CKI Backport Bot) [RHEL-51651] {CVE-2024-42096}
    - PCI/MSI: Fix UAF in msi_capability_init (CKI Backport Bot) [RHEL-51438] {CVE-2024-41096}
    - iommufd: Fix missing update of domains_itree after splitting iopt_area (Jerry Snitselaar) [RHEL-42518     RHEL-28780] {CVE-2023-52801}
    - mm: cachestat: fix folio read-after-free in cache walk (Nico Pache) [RHEL-41739 RHEL-5619]     {CVE-2024-26630}
    - regmap: maple: Fix cache corruption in regcache_maple_drop() (Jaroslav Kysela) [RHEL-43179 RHEL-39706]     {CVE-2024-36019}
    - mm: cachestat: fix two shmem bugs (Nico Pache) [RHEL-36912] {CVE-2024-35797}
    - kprobes/x86: Use copy_from_kernel_nofault() to read from unsafe address (Steve Best) [RHEL-42778     RHEL-34985] {CVE-2024-26946}
    - mm/hugetlb: fix missing hugetlb_lock for resv uncharge (Rafael Aquini) [RHEL-43132 RHEL-37467]     {CVE-2024-36000}
    - net/sched: Fix UAF when resolving a clash (CKI Backport Bot) [RHEL-51022 RHEL-51020] {CVE-2024-41040}
    - KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region() (Maxim Levitsky)     [RHEL-41462 RHEL-32430] {CVE-2024-35791}
    - cxl/region: Fix memregion leaks in devm_cxl_add_region() (John W. Linville) [RHEL-47965 RHEL-23582]     {CVE-2024-40936}
    - x86/coco: Require seeding RNG with RDRAND on CoCo systems (Lenny Szubowicz) [RHEL-42986 RHEL-37269]     {CVE-2024-35875}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:6567 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux operating system.

    Security Fix(es):

    * kernel: efivarfs: force RO when remounting if SetVariable is not supported (CVE-2023-52463)

    * kernel: nfsd: fix RELEASE_LOCKOWNER (CVE-2024-26629)

    * kernel: mm: cachestat: fix folio read-after-free in cache walk (CVE-2024-26630)

    * kernel: mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again (CVE-2024-26720)

    * kernel: Bluetooth: af_bluetooth: Fix deadlock (CVE-2024-26886)

    * kernel: kprobes/x86: Use copy_from_kernel_nofault() to read from unsafe address (CVE-2024-26946)

    * kernel: KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()     (CVE-2024-35791)

    * kernel: mm: cachestat: fix two shmem bugs (CVE-2024-35797)

    * kernel: x86/coco: Require seeding RNG with RDRAND on CoCo systems (CVE-2024-35875)

    * kernel: mm/hugetlb: fix missing hugetlb_lock for resv uncharge (CVE-2024-36000)

    * kernel: iommufd: Fix missing update of domains_itree after splitting iopt_area (CVE-2023-52801)

    * kernel: net: fix out-of-bounds access in ops_init (CVE-2024-36883)

    * kernel: regmap: maple: Fix cache corruption in regcache_maple_drop() (CVE-2024-36019)

    * kernel: usb-storage: alauda: Check whether the media is initialized (CVE-2024-38619)

    * kernel: net: bridge: mst: fix vlan use-after-free (CVE-2024-36979)

    * kernel: scsi: qedf: Ensure the copied buf is NUL terminated (CVE-2024-38559)

    * kernel: xhci: Handle TD clearing for multiple streams case (CVE-2024-40927)

    * kernel: cxl/region: Fix memregion leaks in devm_cxl_add_region() (CVE-2024-40936)

    * kernel: net/sched: Fix UAF when resolving a clash (CVE-2024-41040)

    * kernel: ppp: reject claimed-as-LCP but actually malformed packets (CVE-2024-41044)

    * kernel: mm: prevent derefencing NULL ptr in pfn_section_valid() (CVE-2024-41055)

    * kernel: PCI/MSI: Fix UAF in msi_capability_init (CVE-2024-41096)

    * kernel: xdp: Remove WARN() from __xdp_reg_mem_model() (CVE-2024-42082)

    * kernel: x86: stop playing stack games in profile_pc() (CVE-2024-42096)

    * kernel: Revert mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again     (CVE-2024-42102)

    * kernel: mm: avoid overflows in dirty throttling logic (CVE-2024-42131)

    * kernel: nvme: avoid double free special payload (CVE-2024-41073)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
207315	Rocky Linux 9 : kernel (RLSA-2024:6567)	Nessus	Rocky Linux Local Security Checks	high
207064	Oracle Linux 9 : kernel (ELSA-2024-6567)	Nessus	Oracle Linux Local Security Checks	high
206943	RHEL 9 : kernel (RHSA-2024:6567)	Nessus	Red Hat Local Security Checks	high

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