VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98709: Linux kernel · wifi: mac80211: count only matching reservations in reserved switch

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in d31f655e44631891788ca67018ec5e1ed1c7de86 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in d31f655e44631891788ca67018ec5e1ed1c7de86, 03525b632908b049f4d04cc8a71cdff2329589cf, 437f3727b4fd715266c296435c116288f82666fd +2

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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f, < d31f655e44631891788ca67018ec5e1ed1c7de86	Fixed in d31f655e44631891788ca67018ec5e1ed1c7de86
LinuxLinux	Affected ≥ 5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f, < 03525b632908b049f4d04cc8a71cdff2329589cf	Fixed in 03525b632908b049f4d04cc8a71cdff2329589cf
LinuxLinux	Affected ≥ 5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f, < 437f3727b4fd715266c296435c116288f82666fd	Fixed in 437f3727b4fd715266c296435c116288f82666fd
LinuxLinux	Affected ≥ 5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f, < 5cc54a000960bc88f8c58940164dca0e601ab39c	Fixed in 5cc54a000960bc88f8c58940164dca0e601ab39c
LinuxLinux	Affected ≥ 5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f, < 4ae6ed5b6074df5f3da05fd74c40bb24c5c9b41d	Fixed in 4ae6ed5b6074df5f3da05fd74c40bb24c5c9b41d
LinuxLinux	Affected =3.17	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: count only matching reservations in reserved switch ieee80211_vif_use_reserved_switch() validates a replacement by counting assigned links on ctx->replace_ctx and treating reservations too broadly. A link can still be assigned to the old channel context while holding a reservation that belongs to a different replacement operation. That can make the current replacement appear complete too early. If another link finalizes first, the function can free the WILL_BE_REPLACED chanctx while the unmatched link and driver still use it, leading to a use-after-free in later beacon generation. Require an in-place reservation to point at the current replacement context, and require the reserved and assigned contexts to be the matching replacement pair, before counting or moving the link.

References

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