CVE-2026-52929

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux637784ade221a3c8a7ecd0f583eddd95d6276b9a < 0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85affected
LinuxLinux637784ade221a3c8a7ecd0f583eddd95d6276b9a < a6724b7b812ac8793514a1d5938db5d9d29ae725affected
LinuxLinux637784ade221a3c8a7ecd0f583eddd95d6276b9a < 9662eb0401518f0b4681f10e7fbf688f504f24cfaffected
LinuxLinux637784ade221a3c8a7ecd0f583eddd95d6276b9a < 7dd9a42b044aad2dbe037db1c1e2943582485b44affected
LinuxLinux637784ade221a3c8a7ecd0f583eddd95d6276b9a < 39dc2b0eb5371a669ebc9ec6072b9184eac95418affected
LinuxLinux637784ade221a3c8a7ecd0f583eddd95d6276b9a < d5ea0b3e261fcb2cfff142675516165244cab1daaffected
LinuxLinux637784ade221a3c8a7ecd0f583eddd95d6276b9a < 1c6773b8c081509dcd5cd2954f2b02c50c00f151affected
LinuxLinux637784ade221a3c8a7ecd0f583eddd95d6276b9a < a5f8a90ac9f77c678a9781c0a464b635e0d63e49affected
LinuxLinux4.15affected
LinuxLinux0 < 4.15unaffected
LinuxLinux5.10.259 <= 5.10.*unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.94 <= 6.12.*unaffected
LinuxLinux6.18.36 <= 6.18.*unaffected
LinuxLinux7.0.13 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References