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CVE-2026-31786

In the Linux kernel, the following vulnerability has been resolved: Buffer overflow in drivers/xen/sys-hypervisor.c The build id returned by HYPERVISOR_xen_version(XENVER_build_id) is neither NUL terminated nor a string. The first causes a buffer overflow as sprintf in buildid_show will read and copy till it finds a NUL. 00000000 f4 91 51 f4 dd 38 9e 9d 65 47 52 eb 10 71 db 50 |..Q..8..eGR..q.P| 00000010 b9 a8 01 42 6f 2e 32 |...Bo.2| 00000017 So use a memcp
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:58b02a8175cf8eab6015aaf05a9e0b065d7dd3bd946ba058d3483b65cfab6f59
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":["drivers/xen/sys-hypervisor.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.13"},{"lessThan":"4.13","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.254","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.204","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.170","versionType":"semver"},{"…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/cna/affected/1

{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/xen/sys-hypervisor.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"e3af585e1728c917682b6a3de9a69b41fb9194d4","status":"affected","version":"84b7625728ea311ea35bdaa0eded53c1c56baeaa","versionType":"git"},{"lessThan":"8288d031a01dbacfde3fc643f7be3d23504de64d","status":"affected","version":"84b7625728ea311ea35bdaa0eded53c1c56baeaa","versionType":"git"},{"lessThan":"f458ba102da97fafca106327086fc95f3fc764cb","status":"affected","version":"84b7625728ea311ea…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/xen/sys-hypervisor.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.13"},{"lessThan":"4.13","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.254","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.204","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.170","versionType":"semver"},{"…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/cna/affected/1
{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/xen/sys-hypervisor.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"e3af585e1728c917682b6a3de9a69b41fb9194d4","status":"affected","version":"84b7625728ea311ea35bdaa0eded53c1c56baeaa","versionType":"git"},{"lessThan":"8288d031a01dbacfde3fc643f7be3d23504de64d","status":"affected","version":"84b7625728ea311ea35bdaa0eded53c1c56baeaa","versionType":"git"},{"lessThan":"f458ba102da97fafca106327086fc95f3fc764cb","status":"affected","version":"84b7625728ea311ea…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/cna/metrics/0/cvssV3_1

Source references

10 source assertions
{"url":"http://www.openwall.com/lists/oss-security/2026/04/28/12"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/adp/0/references/0
{"url":"http://xenbits.xen.org/xsa/advisory-485.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/adp/0/references/1
{"url":"https://git.kernel.org/stable/c/27fdbab4221b375de54bf91919798d88520c6e28"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/cna/references/7
{"url":"https://git.kernel.org/stable/c/4b4defd2fce3f966c25adabf46644a85558f1169"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/cna/references/3
{"url":"https://git.kernel.org/stable/c/52cecff98bda2c51eed1c6ce9d21c5d6268fb19d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/cna/references/6
{"url":"https://git.kernel.org/stable/c/5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/cna/references/4
{"url":"https://git.kernel.org/stable/c/8288d031a01dbacfde3fc643f7be3d23504de64d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/d5f59216650c51e5e3fcb7517c825bc8047f60ef"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/cna/references/5
{"url":"https://git.kernel.org/stable/c/e3af585e1728c917682b6a3de9a69b41fb9194d4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/f458ba102da97fafca106327086fc95f3fc764cb"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b229ae33f17cae55fac88c00ed0d3466f895af9c0aac27ae1e73b543e3e29db8 · sha256:26fafad585071753… · /containers/cna/references/2

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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