CVE-2026-52929
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.72%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.72% probability · 52th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85Patch
- https://git.kernel.org/stable/c/1c6773b8c081509dcd5cd2954f2b02c50c00f151Patch
- https://git.kernel.org/stable/c/39dc2b0eb5371a669ebc9ec6072b9184eac95418Patch
- https://git.kernel.org/stable/c/7dd9a42b044aad2dbe037db1c1e2943582485b44Patch
- https://git.kernel.org/stable/c/9662eb0401518f0b4681f10e7fbf688f504f24cfPatch
- https://git.kernel.org/stable/c/a5f8a90ac9f77c678a9781c0a464b635e0d63e49Patch
- https://git.kernel.org/stable/c/a6724b7b812ac8793514a1d5938db5d9d29ae725Patch
- https://git.kernel.org/stable/c/d5ea0b3e261fcb2cfff142675516165244cab1daPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.