SB20260720249 - Infinite loop in Linux kernel sched

Description

This security bulletin contains information about 1 vulnerability.

1) Infinite loop (CVE-ID: CVE-2026-63982)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: 6.8 [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]

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

The vulnerability exists due to improper loop detection in act_mirred in the traffic control subsystem when processing mirred redirect actions to ingress. A local user can configure redirect rules that create a mirred loop to cause a denial of service.

The issue occurs because loop state can be lost when packets are deferred into the backlog during ingress redirection.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/45ac526a0d5733c3695946bd84ec57f24d8f5e66
• https://git.kernel.org/stable/c/66f4607fe788fc7d81bce0e2f7b3726ed2f71284
• https://git.kernel.org/stable/c/db875221ab08d213a83bf30196ae8b64d55a3403