VulnerabilityPublished 18 Oct 2026

CVE-2026-98586: Linux kernel · sctp: hold asoc or transport before mod_timer() in timer handlers

Source GCVE Database

Authoritative record:CVE-2026-98586· Medium

Not known to be exploited · fixed in f9d929026d487a988bfa12c065f892e823e5b6ab : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated by Threat Radar · 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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-4473-fgjm-w85x

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f9d929026d487a988bfa12c065f892e823e5b6ab	Fixed in f9d929026d487a988bfa12c065f892e823e5b6ab
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050	Fixed in f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f	Fixed in d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < cae23ae3f7887a1cf8a75da38edcebeef695040f	Fixed in cae23ae3f7887a1cf8a75da38edcebeef695040f
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 35bf3b23c9a871f44c1453d85f8332be4e088dda	Fixed in 35bf3b23c9a871f44c1453d85f8332be4e088dda
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 27c51a9b55b227309161c903f9ecfbf022516bc2	Fixed in 27c51a9b55b227309161c903f9ecfbf022516bc2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been applied to the Linux kernel to correct the order of operations in SCTP timer handlers. Users should update to the fixed kernel version once available from their distribution or vendor. Since this is a kernel-level issue, applying the official patch or upgrading the kernel is the recommended remediation.

Description

A use-after-free vulnerability in the Linux kernel SCTP implementation was resolved by changing the order of operations in timer handlers. The flaw involved calling mod_timer() before taking a reference on the association or transport, which could lead to a race condition causing a reference count underflow and potential kernel memory corruption.

References

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