CVE-2026-98719: Linux kernel · KVM: SEV: Nullify "have run CPUs" mask pointer when freeing it
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in b1de3ebf59507e0edacaa5cfa2225bc1869e1b63 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 13:47 UTC
Rated Medium by Threat Radar's AI analysis · 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.
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
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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Debiandebian/linuxpkg:deb/debian/linuxOther threats | Affected
| Fixed in
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Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available in Linux kernel versions 6.18.56 and 7.2.10 and later. Users and administrators should update to these or newer versions to remediate the issue.
Description
A vulnerability in the Linux kernel's KVM SEV implementation involves improper handling of the "have run CPUs" mask pointer during freeing, which could lead to a double-free condition. The issue occurs when the mask is freed in the error path of __sev_guest_init(), causing potential memory management errors. The fix involves nullifying the pointer properly and adding helper functions to manage allocation and freeing safely.