CVE-2026-98586sctp: hold asoc or transport before mod_timer() in timer handlers
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: sctp: hold asoc or transport before mod_timer() in timer handlers Take the association or transport reference before rearming a timer in the timer handlers. The existing code calls mod_timer() before taking the reference needed by the rearmed timer without holding the sock lock. This creates a race with timer cleanup: if the timer is deleted after mod_timer() returns but before the reference is taken, the cleanup path can drop the timer's reference and destroy the transport or association. The timer handler then takes a reference on the already freed object and eventually drops it, causing a refcount underflow. Hold the object before mod_timer() and drop the reference if mod_timer() reports that the timer was already pending in timer handlers. Apply the same ordering to the proto-unreachable path, which can rearm a transport timer outside the timer handlers without holding the sock lock.
Timeline
ID reserved
By Linux
- 23 days later
· 23 days later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < f9d929026d487a988bfa12c065f892e823e5b6ab
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 9d3d39da054476e7aa05cd877b93ca73a9a77434
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 27c51a9b55b227309161c903f9ecfbf022516bc2
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 35bf3b23c9a871f44c1453d85f8332be4e088dda
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < cae23ae3f7887a1cf8a75da38edcebeef695040f
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.15.222 – ≤ 5.15.*
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.55 – ≤ 6.18.*
- unaffected 7.2.9 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References7
- https://git.kernel.org/stable/c/f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050 (opens in a new tab)
- https://git.kernel.org/stable/c/f9d929026d487a988bfa12c065f892e823e5b6ab (opens in a new tab)
- https://git.kernel.org/stable/c/9d3d39da054476e7aa05cd877b93ca73a9a77434 (opens in a new tab)
- https://git.kernel.org/stable/c/27c51a9b55b227309161c903f9ecfbf022516bc2 (opens in a new tab)
- https://git.kernel.org/stable/c/d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f (opens in a new tab)
- https://git.kernel.org/stable/c/35bf3b23c9a871f44c1453d85f8332be4e088dda (opens in a new tab)
- https://git.kernel.org/stable/c/cae23ae3f7887a1cf8a75da38edcebeef695040f (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-103631 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-98586)Record last updated .