PT-2026-51722 · Linux · Linux

Published 2026-06-24 · Updated 2026-06-24 · CVE-2026-52929

Mitre

In the Linux kernel, the following vulnerability has been resolved:

sctp: stream: fully roll back denied add-stream state

When ADD OUT STREAMS is denied, SCTP only shrinks the queued chunks and then lowers outcnt. That leaves removed stream metadata behind, so a later re-add can reuse a stale ext and hit a null-pointer dereference in the scheduler get path.

Fix the rollback by tearing down the removed stream state the same way other stream resizes do. Unschedule the current scheduler state, drop the removed stream ext state with sctp stream outq migrate(), and then reschedule the remaining streams.

This keeps scheduler-private RR/FC/PRIO lists consistent while fully rolling back denied outgoing stream additions.

Related Identifiers

CVE-2026-52929

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-52929 · Security Note
• https://git.kernel.org/stable/c/d5ea0b3e261fcb2cfff142675516165244cab1da · Note
• https://git.kernel.org/stable/c/7dd9a42b044aad2dbe037db1c1e2943582485b44 · Note
• https://git.kernel.org/stable/c/a6724b7b812ac8793514a1d5938db5d9d29ae725 · Note
• https://git.kernel.org/stable/c/a5f8a90ac9f77c678a9781c0a464b635e0d63e49 · Note
• https://git.kernel.org/stable/c/0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85 · Note
• https://git.kernel.org/stable/c/39dc2b0eb5371a669ebc9ec6072b9184eac95418 · Note
• https://git.kernel.org/stable/c/1c6773b8c081509dcd5cd2954f2b02c50c00f151 · Note
• https://git.kernel.org/stable/c/9662eb0401518f0b4681f10e7fbf688f504f24cf · Note