VulnerabilityPublished 6 Oct 2026Updated 19 Oct 2026

CVE-2026-98327: Linux kernel · wifi: mac80211: mesh: reset the CSA state when leaving

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in bd3b21145ae2e781daac1bbd19216a63ab4e0cbd : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

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 bd3b21145ae2e781daac1bbd19216a63ab4e0cbd, ba5bf83a81e8832cb84bb3a2da67512f81f57a02, aba8dfb45864441199748c33ce3c1c8ca121c8bd +1

Exploitation evidence

Disclosed: evidence found.
CVE published 6 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.

What to do

Upgrade Linux kernel to bd3b21145ae2e781daac1bbd19216a63ab4e0cbd, ba5bf83a81e8832cb84bb3a2da67512f81f57a02, aba8dfb45864441199748c33ce3c1c8ca121c8bd or 860134b3af77970e006feab7e5decb8c84771c7f.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ b8456a14e9d2770846fcf74de18ff95b676149a3, < bd3b21145ae2e781daac1bbd19216a63ab4e0cbd	Fixed in bd3b21145ae2e781daac1bbd19216a63ab4e0cbd
LinuxLinux	Affected ≥ b8456a14e9d2770846fcf74de18ff95b676149a3, < ba5bf83a81e8832cb84bb3a2da67512f81f57a02	Fixed in ba5bf83a81e8832cb84bb3a2da67512f81f57a02
LinuxLinux	Affected ≥ b8456a14e9d2770846fcf74de18ff95b676149a3, < aba8dfb45864441199748c33ce3c1c8ca121c8bd	Fixed in aba8dfb45864441199748c33ce3c1c8ca121c8bd
LinuxLinux	Affected ≥ b8456a14e9d2770846fcf74de18ff95b676149a3, < 860134b3af77970e006feab7e5decb8c84771c7f	Fixed in 860134b3af77970e006feab7e5decb8c84771c7f
LinuxLinux	Affected =3.13	Fixed in–

AI-suggested

A fix is available in the Linux kernel as indicated by the presence of fixed commit versions. Users should update to a Linux kernel version that includes the fix identified by the commits bd3b21145ae2e781daac1bbd19216a63ab4e0cbd, ba5bf83a81e8832cb84bb3a2da67512f81f57a02, aba8dfb45864441199748c33ce3c1c8ca121c8bd, or 860134b3af77970e006feab7e5decb8c84771c7f. No additional mitigation steps are indicated.

Description

CVE-2026-98327 is a vulnerability in the Linux kernel's mac80211 wireless mesh implementation where the channel switch announcement (CSA) state is not properly reset when leaving a mesh network. This leads to memory leaks and potential state corruption related to channel switching. The issue is fixed by refactoring the reset logic and invoking it when stopping the mesh.

Impact

The flaw causes memory leaks and potential state corruption in the wireless mesh networking code of the Linux kernel. This could degrade system stability or wireless functionality but does not directly indicate privilege escalation or remote code execution. No known exploits in the wild have been reported.

Summary

The vulnerability in Linux kernel version 3.13 involves improper handling of the CSA state in the mac80211 mesh code. Specifically, the ifmsh->csa structure is allocated during channel switch beaconing but only freed when the channel switch completes. If a mesh node leaves while a channel switch is pending, the CSA state and related fields (csa_role and chsw_ttl) leak, causing memory leaks and possible state inconsistencies. The fix involves resetting these states in ieee80211_stop_mesh() to ensure proper cleanup.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 11:39 UTC

Technical details

References

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