Answer in brief
CVE-2026-74587 records a Critical severity (CVSS 9.8) vulnerability in sctp: fix use-after-free of cached ASCONF chunk. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a000c01e60e40e15304ffe48fff051d17a7bea91 <10459b03e2d9ee12435e96f587de4d4cacdbf435 || >=a000c01e60e40e15304ffe48fff051d17a7bea91 <e1bb114e09372fd6e03387ced9ef566da336ed6c || >=a000c01e60e40e15304ffe48fff051d17a7bea91 <179676f0166230c80053a392303485b37c93dd33 || >=a000c01e60e40e15304ffe48fff051d17a7bea91 <dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d || >=a000c01e60e40e15304ffe48fff051d17a7bea91 <618b5c6d049896fcfabb91afc072954c92cb2693 || >=a000c01e60e40e15304ffe48fff051d17a7bea91 <07daf4f9750104960a1d60831b2353c0d41f35fb || >=a000c01e60e40e15304ffe48fff051d17a7bea91 <d949992bc3f00027a2c755e860a11950c75f6073 || >=a000c01e60e40e15304ffe48fff051d17a7bea91 <8c283e7b56adce00193837f3311b06662466fb21 | 10459b03e2d9ee12435e96f587de4d4cacdbf435, e1bb114e09372fd6e03387ced9ef566da336ed6c, 179676f0166230c80053a392303485b37c93dd33, dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d, 618b5c6d049896fcfabb91afc072954c92cb2693, 07daf4f9750104960a1d60831b2353c0d41f35fb, d949992bc3f00027a2c755e860a11950c75f6073, 8c283e7b56adce00193837f3311b06662466fb21 |
| Linux/Linuxgeneric | 3.0 | Not reported |
Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 22, 2026
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.
Quoted source text, attributed separately from HOL analysis.