SB2026042582 - Stack-based buffer overflow in Linux kernel rxrpc

Description

This security bulletin contains information about 1 vulnerability.

1) Stack-based buffer overflow (CVE-ID: CVE-2026-31630)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a stack-based buffer overflow in the AF_RXRPC procfs helpers when formatting socket addresses for procfs output with "%pISpc". A local user can trigger address formatting with a specially crafted IPv6 address representation to cause a denial of service.

The issue occurs because the fixed 50-byte stack buffers are too small for the longest current IPv6-with-port textual form, including certain ISATAP address formats.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/10ebed83f9f6414af4e85bc85ffaeda7effdd874
• https://git.kernel.org/stable/c/a44ce6aa2efb61fe44f2cfab72bb01544bbca272
• https://git.kernel.org/stable/c/db297c78ce537c9ac96f0eda9b25ad72c8caefa9