VulnerabilityPublished 18 Oct 2026

CVE-2026-98646: Linux kernel · tcp: Skip cond_resched() in inet_csk_listen_stop() under BPF context

Source GCVE Database

Authoritative record:CVE-2026-98646· Medium

Not known to be exploited · fixed in ee7246bccb9da66076dd8094daa48bdc761d6b76 : 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 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in ee7246bccb9da66076dd8094daa48bdc761d6b76, eaab8cab451b9502ce224cd202550375b894a467, 55bbebf2829c3f47c5a48fc261740301d0f25f48 +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.

ghsa-vfmc-fwrh-r2q5

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 4ddbcb886268af8d12a23e6640b39d1d9c652b1b, < ee7246bccb9da66076dd8094daa48bdc761d6b76	Fixed in ee7246bccb9da66076dd8094daa48bdc761d6b76
LinuxLinux	Affected ≥ 4ddbcb886268af8d12a23e6640b39d1d9c652b1b, < eaab8cab451b9502ce224cd202550375b894a467	Fixed in eaab8cab451b9502ce224cd202550375b894a467
LinuxLinux	Affected ≥ 4ddbcb886268af8d12a23e6640b39d1d9c652b1b, < 55bbebf2829c3f47c5a48fc261740301d0f25f48	Fixed in 55bbebf2829c3f47c5a48fc261740301d0f25f48
LinuxLinux	Affected ≥ 4ddbcb886268af8d12a23e6640b39d1d9c652b1b, < 23da88d1597ee7fdda373e1530284b763710911f	Fixed in 23da88d1597ee7fdda373e1530284b763710911f
LinuxLinux	Affected ≥ 4ddbcb886268af8d12a23e6640b39d1d9c652b1b, < 5b52417c6196e05618a3b5d9753dbed9adef0166	Fixed in 5b52417c6196e05618a3b5d9753dbed9adef0166
LinuxLinux	Affected =6.5	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to skip cond_resched() in inet_csk_listen_stop() under BPF context. Users should update their Linux kernel to a version that includes this patch to prevent the kernel BUG from occurring. No additional mitigation is required beyond applying the official fix.

Description

A vulnerability in the Linux kernel's TCP stack was resolved involving a call to cond_resched() within inet_csk_listen_stop() under BPF context. The issue occurs when bpf_sock_destroy() runs under rcu_read_lock() and triggers a debug check due to a sleeping function being called from an invalid context. The fix involves skipping cond_resched() in this specific listener path to avoid rescheduling within the iterator's rcu_read_lock() context.

References

Community reviews

Loading reviews…