CVE-2026-98586: Linux kernel · sctp: hold asoc or transport before mod_timer() in timer handlers
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f9d929026d487a988bfa12c065f892e823e5b6ab : update Linux kernel when convenient.
Data as of 26 Oct 2026, 14:05 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in f9d929026d487a988bfa12c065f892e823e5b6ab, f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050, d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f +4
Exploitation evidence
Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available and has been applied in specific Linux kernel commits. Users should update to a Linux kernel version that includes these fixes. Since this is not a cloud service, manual patching is required.
Description
A use-after-free vulnerability in the Linux kernel SCTP implementation was fixed by ensuring that the association or transport reference is held before rearming a timer in timer handlers. The flaw involved calling mod_timer() before taking the necessary reference without holding the socket lock, which could lead to a race condition causing a reference count underflow and potential kernel instability.
References
- git.kernel.org/stable/c/f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050 (opens in a new tab)
- git.kernel.org/stable/c/f9d929026d487a988bfa12c065f892e823e5b6ab (opens in a new tab)
- git.kernel.org/stable/c/9d3d39da054476e7aa05cd877b93ca73a9a77434 (opens in a new tab)
- git.kernel.org/stable/c/27c51a9b55b227309161c903f9ecfbf022516bc2 (opens in a new tab)
- git.kernel.org/stable/c/d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f (opens in a new tab)
- git.kernel.org/stable/c/35bf3b23c9a871f44c1453d85f8332be4e088dda (opens in a new tab)
- git.kernel.org/stable/c/cae23ae3f7887a1cf8a75da38edcebeef695040f (opens in a new tab)