VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98707: Linux kernel · wifi: mac80211: shut down RX BA session timer on teardown

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in e588e83e5c7a0f6d7a77dbbb58927c8c8cfd598e : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:30 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 e588e83e5c7a0f6d7a77dbbb58927c8c8cfd598e, d0da6ab1fc53a68025929baf0947519c6c1684dc, 481f9230284c27052b59c587069f232c5d84779e +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 ≥ a87f736d942c86255e3088c606f0e3eab6bbf784, < e588e83e5c7a0f6d7a77dbbb58927c8c8cfd598e	Fixed in e588e83e5c7a0f6d7a77dbbb58927c8c8cfd598e
LinuxLinux	Affected ≥ a87f736d942c86255e3088c606f0e3eab6bbf784, < d0da6ab1fc53a68025929baf0947519c6c1684dc	Fixed in d0da6ab1fc53a68025929baf0947519c6c1684dc
LinuxLinux	Affected ≥ a87f736d942c86255e3088c606f0e3eab6bbf784, < 481f9230284c27052b59c587069f232c5d84779e	Fixed in 481f9230284c27052b59c587069f232c5d84779e
LinuxLinux	Affected ≥ a87f736d942c86255e3088c606f0e3eab6bbf784, < 09b7d5e4f88504e62ddf4ff31ebeebb3b87578ba	Fixed in 09b7d5e4f88504e62ddf4ff31ebeebb3b87578ba
LinuxLinux	Affected ≥ a87f736d942c86255e3088c606f0e3eab6bbf784, < 7bb2a5bd4f07192fca35644fab7d49a17bfbc861	Fixed in 7bb2a5bd4f07192fca35644fab7d49a17bfbc861
LinuxLinux	Affected =2.6.36	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: shut down RX BA session timer on teardown Tearing down an RX BA session can leave the session timer queued on a freed tid_rx. Later timer-wheel processing and the timer callback itself then run against freed memory. An RX BAR handler can dereference tid_rx under RCU before teardown unpublishes it and stay in its read-side critical section while teardown deletes the session timer. The stale handler can then rearm the timer after timer_delete_sync() returns and before the RCU callback frees tid_rx. Use timer_shutdown_sync() so rearm attempts become ineffective once teardown starts. Keep reorder_timer unchanged: teardown marks the session removed under reorder_lock and its release path checks that state before rearming. session_timer has no equivalent guard because ieee80211_rx_h_ctrl() rearms it before taking reorder_lock.

References

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