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Google: sys-kernel/csql-kernel-6_6: security update to 18867.294.100

high Tenable Cloud Security Plugin ID 454574

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - In the Linux kernel, the following vulnerability has been resolved: iommu: disable SVA when CONFIG_X86 is
 set Patch series "Fix stale IOTLB entries for kernel address space", v7. This proposes a fix for a
 security vulnerability related to IOMMU Shared Virtual Addressing (SVA). In an SVA context, an IOMMU can
 cache kernel page table entries. When a kernel page table page is freed and reallocated for another
 purpose, the IOMMU might still hold stale, incorrect entries. This can be exploited to cause a use-after-
 free or write-after-free condition, potentially leading to privilege escalation or data corruption. This
 solution introduces a deferred freeing mechanism for kernel page table pages, which provides a safe window
 to notify the IOMMU to invalidate its caches before the page is reused. This patch (of 8): In the IOMMU
 Shared Virtual Addressing (SVA) context, the IOMMU hardware shares and walks the CPU's page tables. The
 x86 architecture maps the kernel's virtual address space into the upper portion of every process's page
 table. Consequently, in an SVA context, the IOMMU hardware can walk and cache kernel page table entries.
 The Linux kernel currently lacks a notification mechanism for kernel page table changes, specifically when
 page table pages are freed and reused. The IOMMU driver is only notified of changes to user virtual
 address mappings. This can cause the IOMMU's internal caches to retain stale entries for kernel VA. Use-
 After-Free (UAF) and Write-After-Free (WAF) conditions arise when kernel page table pages are freed and
 later reallocated. The IOMMU could misinterpret the new data as valid page table entries. The IOMMU might
 then walk into attacker-controlled memory, leading to arbitrary physical memory DMA access or privilege
 escalation. This is also a Write-After-Free issue, as the IOMMU will potentially continue to write
 Accessed and Dirty bits to the freed memory while attempting to walk the stale page tables. Currently, SVA
 contexts are unprivileged and cannot access kernel mappings. However, the IOMMU will still walk kernel-
 only page tables all the way down to the leaf entries, where it realizes the mapping is for the kernel and
 errors out. This means the IOMMU still caches these intermediate page table entries, making the described
 vulnerability a real concern. Disable SVA on x86 architecture until the IOMMU can receive notification to
 flush the paging cache before freeing the CPU kernel page table pages. (CVE-2025-71089)

Solution

Update the sys-kernel/csql-kernel-6_6 library and its related packages to version 18867.294.100 or later.

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-121.oval.xml.tar.gz

Plugin Details

Severity: High

ID: 454574

Version: Revision 1.1

Type: Local

Published: 10/1/2026

Updated: 10/1/2026

Risk Information

VPR

Risk Factor: High

Score: 7.6

Percentile: 98.25

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2025-71089

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 1/13/2026

Reference Information

CVE: CVE-2025-71089