VulnerabilityPublished 18 Oct 2026

CVE-2026-98860: Linux kernel · HID: bpf: cast size to ssize_t when checking hid_bpf_hw_request

Source GCVE Database

Authoritative record:CVE-2026-98860· Medium

Not known to be exploited · fixed in f9f808227554b2c116fd07dd2328ecd74ea3f411 : 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: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f9f808227554b2c116fd07dd2328ecd74ea3f411, 97be6396817bd3b11d06239010d27902940bfaa9, 8b85ef0f561039e249c3f883c5280a1449c6dbee +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-243p-r44x-jh77

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=6.12.78 <6.12.113 >=6.18.20 <6.18.56 >=6.19.10 <6.20	Fixed in f9f808227554b2c116fd07dd2328ecd74ea3f411 97be6396817bd3b11d06239010d27902940bfaa9 8b85ef0f561039e249c3f883c5280a1449c6dbee 6.20 6.18.56 6.12.113 3afefbfe55c2a8a0c4bdf6f4cc1f773da120027c
LinuxLinux	Affected =7.0	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to address this vulnerability by casting the size variable to ssize_t to properly handle negative error codes. Users should apply the official kernel updates that include this fix. No alternative mitigations are indicated.

Description

A vulnerability in the Linux kernel related to the HID subsystem and BPF programs was resolved. The issue involved improper casting of a size variable to size_t when checking hardware request results, causing negative error codes to be misinterpreted as large positive values. This led to hardware errors being silently treated as successes, potentially causing BPF programs to operate on uninitialized or stale data. The fix involved casting the size variable to ssize_t to correctly handle negative error codes.

References

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