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CVE-2026-31588

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Use scratch field in MMIO fragment to hold small write values When exiting to userspace to service an emulated MMIO write, copy the to-be-written value to a scratch field in the MMIO fragment if the size of the data payload is 8 bytes or less, i.e. can fit in a single chunk, instead of pointing the fragment directly at the source value. This fixes a class of use-after-free bugs that occur when the emulator initiates
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:013f4fcc83373e2521526468d45bdb99360d668aee30de63a3b93051dd4fc2a7
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"affected","product":"Linux","programFiles":["arch/x86/kvm/x86.c","include/linux/kvm_host.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.5"},{"lessThan":"3.5","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.258","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.209","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.175","versionTyp…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/affected/1

{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/x86/kvm/x86.c","include/linux/kvm_host.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"019d0bd32b9a4646ba35d904907452039e2db700","status":"affected","version":"f78146b0f9230765c6315b2e14f56112513389ad","versionType":"git"},{"lessThan":"4569c66dd9e94a22cd0796b6514a8b25ffff16a1","status":"affected","version":"f78146b0f9230765c6315b2e14f56112513389ad","versionType":"git"},{"lessThan":"52570e73d48f1c73836d37e594667117b4c2a5a8","status":"affected","version":"…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"defaultStatus":"affected","product":"Linux","programFiles":["arch/x86/kvm/x86.c","include/linux/kvm_host.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.5"},{"lessThan":"3.5","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.258","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.209","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.175","versionTyp…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/affected/1
{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/x86/kvm/x86.c","include/linux/kvm_host.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"019d0bd32b9a4646ba35d904907452039e2db700","status":"affected","version":"f78146b0f9230765c6315b2e14f56112513389ad","versionType":"git"},{"lessThan":"4569c66dd9e94a22cd0796b6514a8b25ffff16a1","status":"affected","version":"f78146b0f9230765c6315b2e14f56112513389ad","versionType":"git"},{"lessThan":"52570e73d48f1c73836d37e594667117b4c2a5a8","status":"affected","version":"…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/metrics/0/cvssV3_1

Source references

9 source assertions
{"url":"https://git.kernel.org/stable/c/019d0bd32b9a4646ba35d904907452039e2db700"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/0b16e69d17d8c35c5c9d5918bf596c75a44655d3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/references/8
{"url":"https://git.kernel.org/stable/c/22d2ff69d487a32a8b88f9c970120fc2daa08a77"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/references/5
{"url":"https://git.kernel.org/stable/c/2b83d91e9ae92fe1258d7040a32430bbb3bb7d6e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/references/6
{"url":"https://git.kernel.org/stable/c/3a7b6d75c8f85b09dea893f64a85a356bcf6c3fe"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/references/7
{"url":"https://git.kernel.org/stable/c/4569c66dd9e94a22cd0796b6514a8b25ffff16a1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/52570e73d48f1c73836d37e594667117b4c2a5a8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/b5a02d37eb0739f462fa12df449ab9b3480c783b"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/references/4
{"url":"https://git.kernel.org/stable/c/dc6a6c3db3a4eca7e747cfc46e22c08d016c68f7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3568cc35db3bcd579a281a61489b32d5ee007475d260c382e0cc0389af12e62 · sha256:6257df42c3b72594… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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