VulnerabilityPublished 18 Oct 2026

CVE-2026-98626: Linux kernel · bpf: Restrict CO-RE poisoning to relocatable instructions

Source GCVE Database

Authoritative record:CVE-2026-98626· High

Not known to be exploited · fixed in f2a24101e89dd0804e717da7c1bd6af513698aa2 : patch Linux kernel soon.

Data as of 26 Oct 2026, 13:47 UTC

Severity

High

Rated by Threat Radar · 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 f2a24101e89dd0804e717da7c1bd6af513698aa2, d3219c229d16900cef936adad28633c98946e432, a8c47e62d9aea2d47a09e06c1682c59c21b92449 +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-7qcx-cmxq-wh7w

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d7a252708dbc950ca2064310217e8b9f85846e2f, < f2a24101e89dd0804e717da7c1bd6af513698aa2	Fixed in f2a24101e89dd0804e717da7c1bd6af513698aa2
LinuxLinux	Affected ≥ d7a252708dbc950ca2064310217e8b9f85846e2f, < d3219c229d16900cef936adad28633c98946e432	Fixed in d3219c229d16900cef936adad28633c98946e432
LinuxLinux	Affected ≥ d7a252708dbc950ca2064310217e8b9f85846e2f, < a8c47e62d9aea2d47a09e06c1682c59c21b92449	Fixed in a8c47e62d9aea2d47a09e06c1682c59c21b92449
LinuxLinux	Affected ≥ d7a252708dbc950ca2064310217e8b9f85846e2f, < a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0	Fixed in a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0
LinuxLinux	Affected ≥ d7a252708dbc950ca2064310217e8b9f85846e2f, < 394ae398337c5f87e567f6cd63b937fc2b2f6ddc	Fixed in 394ae398337c5f87e567f6cd63b937fc2b2f6ddc
LinuxLinux	Affected ≥ d7a252708dbc950ca2064310217e8b9f85846e2f, < 8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319	Fixed in 8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319

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

AI-suggested

A fix has been implemented in the Linux kernel to restrict CO-RE poisoning to valid relocatable instructions only. Users should update to the fixed kernel version once available. Since this is a kernel vulnerability, applying the official kernel update from the vendor or distribution is the recommended remediation. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel's BPF CO-RE relocation handling has been resolved. The issue involved improper poisoning of instructions when a relocation could not be resolved, allowing malformed metadata to replace critical instructions such as jumps, calls, and exits. The fix restricts poisoning to only valid relocatable instructions and enforces strict validation checks, preventing invalid instruction modifications.

References

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