Answer in brief
CVE-2026-74587 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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 22, 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.