Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

  - CVE-2017-7487     Li Qiang reported a reference counter leak in the     ipxitf_ioctl function which may result into a     use-after-free vulnerability, triggerable when a IPX     interface is configured.

  - CVE-2017-7645     Tuomas Haanpaa and Matti Kamunen from Synopsys Ltd     discovered that the NFSv2 and NFSv3 server     implementations are vulnerable to an out-of-bounds     memory access issue while processing arbitrarily long     arguments sent by NFSv2/NFSv3 PRC clients, leading to a     denial of service.

  - CVE-2017-7895     Ari Kauppi from Synopsys Ltd discovered that the NFSv2     and NFSv3 server implementations do not properly handle     payload bounds checking of WRITE requests. A remote     attacker with write access to a NFS mount can take     advantage of this flaw to read chunks of arbitrary     memory from both kernel-space and user-space.

  - CVE-2017-8064     Arnd Bergmann found that the DVB-USB core misused the     device logging system, resulting in a use-after-free     vulnerability, with unknown security impact.

  - CVE-2017-8890     It was discovered that the net_csk_clone_lock() function     allows a remote attacker to cause a double free leading     to a denial of service or potentially have other impact.

  - CVE-2017-8924     Johan Hovold found that the io_ti USB serial driver     could leak sensitive information if a malicious USB     device was connected.

  - CVE-2017-8925     Johan Hovold found a reference counter leak in the     omninet USB serial driver, resulting in a use-after-free     vulnerability. This can be triggered by a local user     permitted to open tty devices.

  - CVE-2017-9074     Andrey Konovalov reported that the IPv6 fragmentation     implementation could read beyond the end of a packet     buffer. A local user or guest VM might be able to use     this to leak sensitive information or to cause a denial     of service (crash).

  - CVE-2017-9075     Andrey Konovalov reported that the SCTP/IPv6     implementation wrongly initialised address lists on     connected sockets, resulting in a use-after-free     vulnerability, a similar issue to CVE-2017-8890. This     can be triggered by any local user.

  - CVE-2017-9076 / CVE-2017-9077     Cong Wang found that the TCP/IPv6 and DCCP/IPv6     implementations wrongly initialised address lists on     connected sockets, a similar issue to CVE-2017-9075.

  - CVE-2017-9242     Andrey Konovalov reported a packet buffer overrun in the     IPv6 implementation. A local user could use this for     denial of service (memory corruption; crash) and     possibly for privilege escalation.

  - CVE-2017-1000364     The Qualys Research Labs discovered that the size of the     stack guard page is not sufficiently large. The     stack-pointer can jump over the guard-page and moving     from the stack into another memory region without     accessing the guard-page. In this case no page-fault     exception is raised and the stack extends into the other     memory region. An attacker can exploit this flaw for     privilege escalation.

  The default stack gap protection is set to 256 pages and can be   configured via the stack_guard_gap kernel parameter on the kernel   command line.

  Further details can be found at   https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - kernel: netfilter: use-after-free in tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c     (CVE-2017-18017)

  - The ia64 subsystem in the Linux kernel before 2.6.26 allows local users to cause a denial of service     (stack consumption and system crash) via a crafted application that leverages the mishandling of invalid     Register Stack Engine (RSE) state. (CVE-2006-3635)

  - drivers/media/video/videobuf-vmalloc.c in the Linux kernel before 2.6.24 does not initialize     videobuf_mapping data structures, which allows local users to trigger an incorrect count value and     videobuf leak via unspecified vectors, a different vulnerability than CVE-2010-5321. (CVE-2007-6761)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - kernel: Buffer overflow due to unbounded strcpy in ISDN I4L driver (CVE-2017-12762)

  - kernel: buffer-overflow hardening in WiFi beacon validation code. (CVE-2019-16746)

  - include/linux/init_task.h in the Linux kernel before 2.6.35 does not prevent signals with a process group     ID of zero from reaching the swapper process, which allows local users to cause a denial of service     (system crash) by leveraging access to this process group. (CVE-2010-5328)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

ID	Name	Product	Family	Published	Updated	Severity
100877	Debian DSA-3886-1 : linux - security update (Stack Clash)	Nessus	Debian Local Security Checks	6/20/2017	1/4/2021	critical
199257	RHEL 5 : kernel (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	6/3/2024	6/4/2024	critical
199273	RHEL 6 : kernel (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	6/3/2024	6/14/2024	critical

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