VulnerabilityPublished 23 Oct 2026

CVE-2026-98887: Linux kernel · wifi: mac80211_hwsim: reject undersized HWSIM_ATTR_TX_INFO

Source GCVE Database

Authoritative record:CVE-2026-98887· Medium

Not known to be exploited · fixed in b5b1234bbfa25537fb9a5c0d62c328ed4547f721 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in b5b1234bbfa25537fb9a5c0d62c328ed4547f721, 59e1f2a0242232b4a3af144ae317d3913fc09046, 13edd8ea7ff2ce6a964b290ef2034cd8cbed96c7 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 23 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.

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What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 5d44fe7c9808c56e136e59147bd932f5491520f1, < b5b1234bbfa25537fb9a5c0d62c328ed4547f721	Fixed in b5b1234bbfa25537fb9a5c0d62c328ed4547f721
LinuxLinux	Affected ≥ 5d44fe7c9808c56e136e59147bd932f5491520f1, < 59e1f2a0242232b4a3af144ae317d3913fc09046	Fixed in 59e1f2a0242232b4a3af144ae317d3913fc09046
LinuxLinux	Affected ≥ 5d44fe7c9808c56e136e59147bd932f5491520f1, < 13edd8ea7ff2ce6a964b290ef2034cd8cbed96c7	Fixed in 13edd8ea7ff2ce6a964b290ef2034cd8cbed96c7
LinuxLinux	Affected ≥ 5d44fe7c9808c56e136e59147bd932f5491520f1, < 6f6368b20f8c9481fa7ba7b672dcb3c9f36b2695	Fixed in 6f6368b20f8c9481fa7ba7b672dcb3c9f36b2695
LinuxLinux	Affected ≥ 5d44fe7c9808c56e136e59147bd932f5491520f1, < 3dc723ac78a6e4fa0fd49e27e487ed319da40a9f	Fixed in 3dc723ac78a6e4fa0fd49e27e487ed319da40a9f
LinuxLinux	Affected ≥ 5d44fe7c9808c56e136e59147bd932f5491520f1, < 3a96bb65b4b820d8b41fa155781ec1c29e3479d4	Fixed in 3a96bb65b4b820d8b41fa155781ec1c29e3479d4

AI-suggested

A fix is available that enforces exact length validation on the HWSIM_ATTR_TX_INFO attribute, preventing malformed attributes from being processed. Users should apply the official Linux kernel update that includes this patch to mitigate the vulnerability.

Description

A vulnerability in the Linux kernel's mac80211_hwsim component allowed undersized HWSIM_ATTR_TX_INFO attributes to be accepted, leading to out-of-bounds reads. The issue was due to insufficient length validation of the attribute payload before casting and reading it as a struct hwsim_tx_rate pointer. This flaw has been resolved by enforcing exact length checks in the attribute policy to reject malformed inputs.

References

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