VulnerabilityPublished 18 Oct 2026

CVE-2026-98719: Linux kernel · KVM: SEV: Nullify "have run CPUs" mask pointer when freeing it

Source GCVE Database

Authoritative record:CVE-2026-98719· Medium

Not known to be exploited · fixed in b1de3ebf59507e0edacaa5cfa2225bc1869e1b63 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in b1de3ebf59507e0edacaa5cfa2225bc1869e1b63, 8abbc76120a74bfba1851bd97528099d715e45c6, 0fbc7fec2242de6c3dcea6de55573c428e820173 +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-j294-cf74-gq7q

What to do

Upgrade Linux to b1de3ebf59507e0edacaa5cfa2225bc1869e1b63, 8abbc76120a74bfba1851bd97528099d715e45c6 or 0fbc7fec2242de6c3dcea6de55573c428e820173; Linux and the Debian debian/linux package to 7.2.10 or 6.18.56.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 6aef7cf800098749ff5d660222efaf6e01e98c09, < b1de3ebf59507e0edacaa5cfa2225bc1869e1b63	Fixed in b1de3ebf59507e0edacaa5cfa2225bc1869e1b63
LinuxLinux	Affected ≥ 12c1f6e03f944e399bd2c88441dca5dc702b95a5, < 8abbc76120a74bfba1851bd97528099d715e45c6	Fixed in 8abbc76120a74bfba1851bd97528099d715e45c6
LinuxLinux	Affected ≥ 9784e5ca91b37b387f3f414af4340c54f7a63566, < 0fbc7fec2242de6c3dcea6de55573c428e820173	Fixed in 0fbc7fec2242de6c3dcea6de55573c428e820173
LinuxLinux	Affected >=7.2.9 <7.2.10	Fixed in 7.2.10
LinuxLinux	Affected >=6.18.55 <6.18.56	Fixed in 6.18.56
Debiandebian/linux`pkg:deb/debian/linux`Other threats	Affected >=6.18.55 <6.18.56 >=7.2.9 <7.2.10	Fixed in 6.18.56 7.2.10

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 nullify the 'have run CPUs' mask pointer when freeing it, preventing double-free errors. Users should update to the fixed kernel version once it is released.

Description

A vulnerability in the Linux kernel's KVM SEV implementation related to improper handling of the 'have run CPUs' mask pointer has been resolved. The issue involves a double-free condition when freeing this mask if __sev_guest_init() fails. The fix nullifies the pointer properly to prevent double-free errors. This vulnerability does not have a CVSS score and no known exploits in the wild have been reported.

References

Community reviews

Loading reviews…