The remote Redhat Enterprise Linux 5 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:0464 advisory.

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

    Security Fix(es):

    An industry-wide issue was found in the way many modern microprocessor designs have implemented     speculative execution of instructions (a commonly used performance optimization). There are three primary     variants of the issue which differ in the way the speculative execution can be exploited.

    Note: This issue is present in hardware and cannot be fully fixed via software update. The updated kernel     packages provide software mitigation for this hardware issue at a cost of potential performance penalty.
    Please refer to References section for further information about this issue and the performance impact.

    In this update mitigations for x86-64 architecture are provided.

    * Variant CVE-2017-5753 triggers the speculative execution by performing a bounds-check bypass. It relies     on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact     that memory accesses may cause allocation into the microprocessor's data cache even for speculatively     executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use     this flaw to cross the syscall boundary and read privileged memory by conducting targeted cache side-     channel attacks. (CVE-2017-5753, Important)

    * Variant CVE-2017-5754 relies on the fact that, on impacted microprocessors, during speculative execution     of instruction permission faults, exception generation triggered by a faulting access is suppressed until     the retirement of the whole instruction block. In a combination with the fact that memory accesses may     populate the cache even when the block is being dropped and never committed (executed), an unprivileged     local attacker could use this flaw to read privileged (kernel space) memory by conducting targeted cache     side-channel attacks. (CVE-2017-5754, Important)

    Red Hat would like to thank Google Project Zero for reporting these issues.

    Bug Fix(es):

    * Previously, the page table isolation feature was able to modify the kernel Page Global Directory (PGD)     entries with the _NX bit even for CPUs without the capability to use the no execute (NX) bit technology.
    Consequently, the page tables got corrupted, and the kernel panicked at the first page-fault occurrence.
    This update adds the check of CPU capabilities before modifying kernel PGD entries with _NX. As a result,     the operating system no longer panics on boot due to corrupted page tables under the described     circumstances. (BZ#1538169)

    * When booting the operating system with the Kernel Page Table Isolation option enabled, the HPET VSYSCALL     shadow mapping was not placed correctly. Consequently, the High Precision Event Timer (HPET) feature was     not available early enough, and warnings on boot time occurred. This update fixes the placement of HPET     VSYSCALL, and the warnings on boot time due to this behavior no longer occur. (BZ#1541281)

    * Previously, the routine preparing the kexec crashkernel area did not properly clear the page allocated     to be kexec's Page Global Directory (PGD). Consequently, the page table isolation shadow mapping routines     failed with a warning message when setting up page table entries. With this update, the underlying source     code has been fixed to clear the kexec PGD allocated page before setting up its page table entries. As a     result, warnings are no longer issued when setting up kexec. (BZ#1541285)

    * When changing a kernel page mapping from Read Only (RO) to Read Write (RW), the Translation Lookaside     Buffer (TLB) entry was previously not updated. Consequently, a protection fault on a write operation     occurred, which led to a kernel panic. With this update, the underlying source code has been fixed to     handle such kind of fault properly, and the kernel no longer panics in the described situation.
    (BZ#1541892)

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.

Detections

Analytics

RHEL 5 : kernel (RHSA-2018:0464)

medium Nessus Plugin ID 194070

Version 1.2

Version 1.1

Version 1.0

Version 1.2 Nov 5, 2024, 12:50 PM CVSS metrics ("Cvssv4 score" set to 0.0) CVSSv2 severity (based on None, severity decreased from "High" to "Low") Plugin metadata Plugin Feed: 202411051250
Version 1.1 Apr 29, 2024, 9:06 AM Exploit attributes ("Exploit framework canvas" set to "True") Exploit attributes ("Exploited by malware" set to "True") Plugin Feed: 202404290906
Version 1.0 Apr 28, 2024, 3:17 AM New Plugin Feed: 202404280317