VulnerabilityPublished 13 Jan 2026Updated 21 Oct 2026

CVE-2025-71073: Linux kernel · Input: lkkbd – disable pending work before freeing device

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in e58c88f0cb2d8ed89de78f6f17409d29cfab6c5c : update Linux kernel when convenient.

Data as of 26 Oct 2026, 10:24 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e58c88f0cb2d8ed89de78f6f17409d29cfab6c5c, cffc4e29b1e2d44ab094cf142d7c461ff09b9104, 8cf889d45bbc8477206dda78c8f757ea8ff68213 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 13 Jan 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 e58c88f0cb2d8ed89de78f6f17409d29cfab6c5c, cffc4e29b1e2d44ab094cf142d7c461ff09b9104, 8cf889d45bbc8477206dda78c8f757ea8ff68213 or 3a7cd1397c209076c371d53bf39a55c138f62342.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e58c88f0cb2d8ed89de78f6f17409d29cfab6c5c	Fixed in e58c88f0cb2d8ed89de78f6f17409d29cfab6c5c
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < cffc4e29b1e2d44ab094cf142d7c461ff09b9104	Fixed in cffc4e29b1e2d44ab094cf142d7c461ff09b9104
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 8cf889d45bbc8477206dda78c8f757ea8ff68213	Fixed in 8cf889d45bbc8477206dda78c8f757ea8ff68213
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 3a7cd1397c209076c371d53bf39a55c138f62342	Fixed in 3a7cd1397c209076c371d53bf39a55c138f62342
LinuxLinux	Affected =2.6.12	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: Input: lkkbd - disable pending work before freeing device lkkbd_interrupt() schedules lk->tq via schedule_work(), and the work handler lkkbd_reinit() dereferences the lkkbd structure and its serio/input_dev fields. lkkbd_disconnect() and error paths in lkkbd_connect() free the lkkbd structure without preventing the reinit work from being queued again until serio_close() returns. This can allow the work handler to run after the structure has been freed, leading to a potential use-after-free. Use disable_work_sync() instead of cancel_work_sync() to ensure the reinit work cannot be re-queued, and call it both in lkkbd_disconnect() and in lkkbd_connect() error paths after serio_open().

References

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