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VulnerabilityPublished

CVE-2026-98713: Linux kernel · KVM: arm64: Apply the fine-grained UNDEFs without FEAT_FGT

Affects Linux kernelSource CVE Database V5

0

Not known to be exploited · fixed in af3300b3a6bace925a496f3520e171c07b999c72 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 11:07 UTC

Severity
Unrated

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 af3300b3a6bace925a496f3520e171c07b999c72, 1113374a17d7f7d16b02ee0bbd9b1e7a60cbb087, 4bdd2b3a708c1feb701cb8b62feb8ad2fd77bb07 +1

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 18 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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.

What to do

Upgrade Linux kernel to af3300b3a6bace925a496f3520e171c07b999c72, 1113374a17d7f7d16b02ee0bbd9b1e7a60cbb087, 4bdd2b3a708c1feb701cb8b62feb8ad2fd77bb07 or 2f4a15c52a552c5244ec27f4ca8bda855594f918.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f, < af3300b3a6bace925a496f3520e171c07b999c72
Fixed in
  • af3300b3a6bace925a496f3520e171c07b999c72
LinuxLinuxAffected
  • ≥ f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f, < 1113374a17d7f7d16b02ee0bbd9b1e7a60cbb087
Fixed in
  • 1113374a17d7f7d16b02ee0bbd9b1e7a60cbb087
LinuxLinuxAffected
  • ≥ f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f, < 4bdd2b3a708c1feb701cb8b62feb8ad2fd77bb07
Fixed in
  • 4bdd2b3a708c1feb701cb8b62feb8ad2fd77bb07
LinuxLinuxAffected
  • ≥ f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f, < 2f4a15c52a552c5244ec27f4ca8bda855594f918
Fixed in
  • 2f4a15c52a552c5244ec27f4ca8bda855594f918
LinuxLinuxAffected
  • =6.9
Fixed in–

AI-suggested

This vulnerability has been fixed in the Linux kernel. Users should update to the fixed versions identified by the commit hashes provided. No additional mitigation is required beyond applying the official fix.

Description

A vulnerability in the Linux kernel's KVM arm64 implementation related to fine-grained undefined instruction (UNDEF) handling without FEAT_FGT feature support has been resolved. The fix ensures that fine-grained undefined traps (FGUs) are applied regardless of hardware support for FEAT_FGT, preventing spurious warnings and incorrect trap handling in certain guest configurations.

References

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