Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: sctp: fix use-after-free of cached ASCONF chunk addip_last_asconf caches the outstanding outbound ASCONF chunk. The normal ASCONF-ACK completion path releases the chunk and clears the pointer. However, sctp_asconf_queue_teardown() releases the cached chunk without clearing addip_last_asconf. During peer restart handling, sctp_sf_do_dupcook_a() queues SCTP_CMD_PURGE_ASCONF_QUEUE, which invokes sctp_asconf_queue_teardown() while the association remains alive and leaves the pointer dangling. A delayed authenticated ASCONF-ACK can then reach sctp_sf_do_asconf_ack(), which accesses the stale chunk and passes it to sctp_process_asconf_ack(), causing a use-after-free and a second release. Clearing the pointer exposes a race with T4 expiry. Peer restart handling queues the timer stop before the purge, but SCTP_CMD_TIMER_STOP uses timer_delete(), which does not wait for a callback already running on another CPU. Such a callback can reach sctp_sf_t4_timer_expire() after the purge and dereference NULL. Clear addip_last_asconf after releasing the cached chunk, and make sctp_sf_t4_timer_expire() consume a stale T4 expiry if no outstanding ASCONF remains.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected a000c01e60e40e15304ffe48fff051d17a7bea91 before 10459b03e2d9ee12435e96f587de4d4cacdbf435; affected a000c01e60e40e15304ffe48fff051d17a7bea91 before e1bb114e09372fd6e03387ced9ef566da336ed6c; affected a000c01e60e40e15304ffe48fff051d17a7bea91 before 179676f0166230c80053a392303485b37c93dd33; affected a000c01e60e40e15304ffe48fff051d17a7bea91 before dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d; affected a000c01e60e40e15304ffe48fff051d17a7bea91 before 618b5c6d049896fcfabb91afc072954c92cb2693; affected a000c01e60e40e15304ffe48fff051d17a7bea91 before 07daf4f9750104960a1d60831b2353c0d41f35fb; affected a000c01e60e40e15304ffe48fff051d17a7bea91 before d949992bc3f00027a2c755e860a11950c75f6073; affected a000c01e60e40e15304ffe48fff051d17a7bea91 before 8c283e7b56adce00193837f3311b06662466fb21 |
| Linux / Linux | affected 3.0; unaffected 0 before 3.0; unaffected 5.10.265 through 5.10.*; unaffected 5.15.216 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.152 through 6.6.*; unaffected 6.12.104 through 6.12.*; unaffected 6.18.45 through 6.18.*; unaffected 7.1.9 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/10459b03e2d9ee12435e96f587de4d4cacdbf435
- https://git.kernel.org/stable/c/e1bb114e09372fd6e03387ced9ef566da336ed6c
- https://git.kernel.org/stable/c/179676f0166230c80053a392303485b37c93dd33
- https://git.kernel.org/stable/c/dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d
- https://git.kernel.org/stable/c/618b5c6d049896fcfabb91afc072954c92cb2693
- https://git.kernel.org/stable/c/07daf4f9750104960a1d60831b2353c0d41f35fb
- https://git.kernel.org/stable/c/d949992bc3f00027a2c755e860a11950c75f6073
- https://git.kernel.org/stable/c/8c283e7b56adce00193837f3311b06662466fb21
ADP enrichment
No English description supplied.
No references supplied.