VulnerabilityPublished 18 Oct 2026

CVE-2026-98580: Linux kernel · nfc: llcp: Fix race condition in accept_queue lifecycle

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in da8a07757383614a8380a0f7dd54749d2687b82e : patch Linux kernel soon.

Data as of 26 Oct 2026, 12:55 UTC

Severity

High

Rated High by Threat Radar's AI analysis · 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 da8a07757383614a8380a0f7dd54749d2687b82e, d2093a0981138876212bc5f473bdbfba0786e064, d5e1c92d09caed19f2988739695ce611a86ba6f8 +5

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 ≥ 50b78b2a6500d0e97c204c1b6c51df8c17358bbe, < da8a07757383614a8380a0f7dd54749d2687b82e	Fixed in da8a07757383614a8380a0f7dd54749d2687b82e
LinuxLinux	Affected ≥ 50b78b2a6500d0e97c204c1b6c51df8c17358bbe, < d2093a0981138876212bc5f473bdbfba0786e064	Fixed in d2093a0981138876212bc5f473bdbfba0786e064
LinuxLinux	Affected ≥ 50b78b2a6500d0e97c204c1b6c51df8c17358bbe, < d5e1c92d09caed19f2988739695ce611a86ba6f8	Fixed in d5e1c92d09caed19f2988739695ce611a86ba6f8
LinuxLinux	Affected ≥ 50b78b2a6500d0e97c204c1b6c51df8c17358bbe, < c3eef2f988a3db9690369d7cef9a3344dd9788d3	Fixed in c3eef2f988a3db9690369d7cef9a3344dd9788d3
LinuxLinux	Affected ≥ 50b78b2a6500d0e97c204c1b6c51df8c17358bbe, < 41256821762a7114906b178826d17098e2fa5992	Fixed in 41256821762a7114906b178826d17098e2fa5992
LinuxLinux	Affected ≥ 50b78b2a6500d0e97c204c1b6c51df8c17358bbe, < 53867f6acb1af7f12d6485fa8a2819318f89083b	Fixed in 53867f6acb1af7f12d6485fa8a2819318f89083b

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available and has been applied in the Linux kernel. Users should update to a kernel version that includes the referenced fixes. No additional mitigation actions are required beyond applying the official patch.

Description

A race condition vulnerability in the Linux kernel's NFC LLCP socket handling was fixed. The flaw involved concurrent unlinking and releasing of the same child socket due to improper synchronization between socket release and accept dequeue operations. This could lead to use-after-free or NULL pointer dereference errors. The fix involves changing locking mechanisms, deferring resource release to a workqueue, and adding checks to prevent hangs and ensure idempotency.

Impact

The vulnerability can cause use-after-free or NULL pointer dereference conditions in the NFC LLCP socket handling code, potentially leading to kernel crashes or memory corruption. There is no indication of known exploits in the wild. The impact is limited to the affected NFC LLCP socket subsystem within the Linux kernel.

Summary

CVE-2026-98580 addresses a race condition in the Linux kernel's NFC LLCP socket accept queue lifecycle. The vulnerability arises because nfc_llcp_socket_release() uses bh_lock_sock(), which does not synchronize with the process-context lock_sock() held during accept dequeue. This allows concurrent unlinking and releasing of the same child socket, causing use-after-free or NULL pointer dereference in nfc_llcp_accept_unlink(). The patch replaces bh_lock_sock() with lock_sock() in socket release, defers final resource release to a workqueue to avoid sleeping in atomic context, adds reference counting safeguards, verifies listener socket state after timeout, properly unlinks unaccepted child sockets, and makes unlinking idempotent with NULL checks.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 10:23 UTC

Technical details

References

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