SB2026082478 - Out-of-bounds read in Linux kernel atm
Published: August 24, 2026
Security Bulletin ID
SB2026082478
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-74689)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in vcc_setsockopt() when processing crafted setsockopt calls. A local user can supply a mismatched level or a shortened optlen value to trigger an out-of-bounds read and disclose sensitive information.
The issue can also be triggered if a cgroup BPF setsockopt filter shrinks optlen after entry.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/2c5988c7349c0b64a7e0441bfc6e1dca54f7116a
- https://git.kernel.org/stable/c/35f258fee9ed358c6d0f57f91c30bf029c3724af
- https://git.kernel.org/stable/c/6eb6af88710977eb529b558a07294874d8c40c4d
- https://git.kernel.org/stable/c/9f77c1ab382188f5b51982fab6d913443b6dc59f
- https://git.kernel.org/stable/c/b3bcd5d65ac03c15787b2a5b36c718e26a689336
- https://git.kernel.org/stable/c/d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3