VulnerabilityPublished 18 Oct 2026

CVE-2026-98622: Linux kernel · net/sched: act_ct: don't WARN on benign flow_offload_alloc() failure

Source GCVE Database

Authoritative record:CVE-2026-98622· High

Not known to be exploited · fixed in e8fcf3f08834e939b797311742ee72b1e2a08096 : patch Linux kernel soon.

Data as of 26 Oct 2026, 12:55 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

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 e8fcf3f08834e939b797311742ee72b1e2a08096, d805560ad69cb266d669341ca01e26bffb0d2c67, d512c484bd93a5f2794aa03c9faeb7bcb82dbd4a +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.

ghsa-qg6m-cv4g-hx6q

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 64ff70b80fd403110b67dd9f7184a604fdb0da43, < e8fcf3f08834e939b797311742ee72b1e2a08096	Fixed in e8fcf3f08834e939b797311742ee72b1e2a08096
LinuxLinux	Affected ≥ 64ff70b80fd403110b67dd9f7184a604fdb0da43, < d805560ad69cb266d669341ca01e26bffb0d2c67	Fixed in d805560ad69cb266d669341ca01e26bffb0d2c67
LinuxLinux	Affected ≥ 64ff70b80fd403110b67dd9f7184a604fdb0da43, < d512c484bd93a5f2794aa03c9faeb7bcb82dbd4a	Fixed in d512c484bd93a5f2794aa03c9faeb7bcb82dbd4a
LinuxLinux	Affected ≥ 64ff70b80fd403110b67dd9f7184a604fdb0da43, < af475f599270e59313552e6c6f3af8507da672b8	Fixed in af475f599270e59313552e6c6f3af8507da672b8
LinuxLinux	Affected ≥ 64ff70b80fd403110b67dd9f7184a604fdb0da43, < 650787233c2fd6e515a7c5f371019a9fa080ccd2	Fixed in 650787233c2fd6e515a7c5f371019a9fa080ccd2
LinuxLinux	Affected ≥ 64ff70b80fd403110b67dd9f7184a604fdb0da43, < 00734f3684fcec42c319bedfe68a5d357c720b53	Fixed in 00734f3684fcec42c319bedfe68a5d357c720b53

AI-suggested

A fix has been applied to the Linux kernel that removes the WARN on benign flow_offload_alloc() failures, preventing kernel panics under the described conditions. Users should update to the patched kernel version when available. No additional mitigation is required as the fix is behavior-preserving and addresses the root cause.

Description

A vulnerability in the Linux kernel's net/sched subsystem related to the act_ct module has been resolved. The issue involved a WARN triggered on benign failures of flow_offload_alloc(), which occur under normal load conditions and are not kernel bugs. When panic_on_warn=1, an unprivileged user could cause a kernel panic by racing a conntrack flush against a 'tc ... action ct commit' classifier. The fix removes the WARN without changing behavior, preventing unintentional panics.

References

Community reviews

Loading reviews…