CVE-2026-98130sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START The SCTP_CMD_TIMER_START handler checks timer_pending() before calling timer_reduce(). The timer can expire and detach between these operations, causing timer_reduce() to rearm the timer without taking the association reference required for the newly armed timer. The timer callback later unconditionally drops its association reference, which can leave the association reference count unbalanced and result in use-after-free during association teardown. Use the return value of timer_reduce() to determine whether the timer was actually armed. Take the association reference only when timer_reduce() successfully starts a new timer, closing the race between checking the timer state and rearming it. This issue was reported by Nico Yip (@_cyeaa_) working with TrendAI Zero Day Initiative.
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Undergoing Analysis
- Record last updated
- Oct 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 20a785aa52c82246055a089e55df9dac47d67da1 before cbf2df9aac4202f9fb0b361a7fe8c79b29fad92c; from 20a785aa52c82246055a089e55df9dac47d67da1 before 3205a20f837f5b1f009427ac3d9f706bf8a6fbec; from 20a785aa52c82246055a089e55df9dac47d67da1 before 755d70ca845fd9b87c7b338ae6ae832b08cd0005; 20a785aa52c82246055a089e55df9dac47d67da1 builds before 09e7f9290d63178f56095d5c18fb9f9470153db5; from 20a785aa52c82246055a089e55df9dac47d67da1 before e42ba56281ca3ae2dcb3558bebee9a1c9a4831d9; 20a785aa52c82246055a089e55df9dac47d67da1 builds before 00b841bac10230c557be6b38efc48508198fe23e; 20a785aa52c82246055a089e55df9dac47d67da1 builds before 3d698d1e6c8bc41e3e1707777a016f1bdd07842d; from 20a785aa52c82246055a089e55df9dac47d67da1 before 2188569e7e1b0bc3f3b557dc97ab7a02befc11c8; and 6 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/cbf2df9aac4202f9fb0b361a7fe8c79b29fad92c
- https://git.kernel.org/stable/c/3205a20f837f5b1f009427ac3d9f706bf8a6fbec
- https://git.kernel.org/stable/c/755d70ca845fd9b87c7b338ae6ae832b08cd0005
- https://git.kernel.org/stable/c/09e7f9290d63178f56095d5c18fb9f9470153db5
- https://git.kernel.org/stable/c/e42ba56281ca3ae2dcb3558bebee9a1c9a4831d9
- https://git.kernel.org/stable/c/00b841bac10230c557be6b38efc48508198fe23e
- https://git.kernel.org/stable/c/3d698d1e6c8bc41e3e1707777a016f1bdd07842d
- https://git.kernel.org/stable/c/2188569e7e1b0bc3f3b557dc97ab7a02befc11c8
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.