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Google: sys-kernel/cchost-kernel-6_12, sys-kernel/csql-kernel-6_12: security update to 19506.120.44

high Tenable Cloud Security Plugin ID 471856

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: bpf: Fix undefined behavior in
 interpreter sdiv/smod for INT_MIN The BPF interpreter's signed 32-bit division and modulo handlers use the
 kernel abs() macro on s32 operands. The abs() macro documentation (include/linux/math.h) explicitly states
 the result is undefined when the input is the type minimum. When DST contains S32_MIN (0x80000000),
 abs((s32)DST) triggers undefined behavior and returns S32_MIN unchanged on arm64/x86. This value is then
 sign-extended to u64 as 0xFFFFFFFF80000000, causing do_div() to compute the wrong result. The verifier's
 abstract interpretation (scalar32_min_max_sdiv) computes the mathematically correct result for range
 tracking, creating a verifier/interpreter mismatch that can be exploited for out-of-bounds map value
 access. Introduce abs_s32() which handles S32_MIN correctly by casting to u32 before negating, avoiding
 signed overflow entirely. Replace all 8 abs((s32)...) call sites in the interpreter's sdiv32/smod32
 handlers. s32 is the only affected case -- the s64 division/modulo handlers do not use abs().
 (CVE-2026-31525)

Solution

Update the sys-kernel/cchost-kernel-6_12 library and its related packages to version 19506.120.44 or later.

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-129.oval.xml.tar.gz

Plugin Details

Severity: High

ID: 471856

Version: Revision 1.1

Type: Local

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.03

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-2026-31525

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: 4/22/2026

Reference Information

CVE: CVE-2026-31525