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CVE-2026-31786 (GCVE-0-2026-31786)

Vulnerability from cvelistv5 – Published: 2026-04-30 10:31 – Updated: 2026-08-05 12:25
VLAI
Title
Buffer overflow in drivers/xen/sys-hypervisor.c
Summary
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 memcpy instead of sprintf to have the correct value: 00000000 f4 91 51 f4 dd 00 9e 9d 65 47 52 eb 10 71 db 50 |..Q.....eGR..q.P| 00000010 b9 a8 01 42 |...B| 00000014 (the above have a hack to embed a zero inside and check it's returned correctly). This is XSA-485 / CVE-2026-31786
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 84b7625728ea311ea35bdaa0eded53c1c56baeaa , < e3af585e1728c917682b6a3de9a69b41fb9194d4 (git)
Affected: 84b7625728ea311ea35bdaa0eded53c1c56baeaa , < 8288d031a01dbacfde3fc643f7be3d23504de64d (git)
Affected: 84b7625728ea311ea35bdaa0eded53c1c56baeaa , < f458ba102da97fafca106327086fc95f3fc764cb (git)
Affected: 84b7625728ea311ea35bdaa0eded53c1c56baeaa , < 4b4defd2fce3f966c25adabf46644a85558f1169 (git)
Affected: 84b7625728ea311ea35bdaa0eded53c1c56baeaa , < 5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a (git)
Affected: 84b7625728ea311ea35bdaa0eded53c1c56baeaa , < d5f59216650c51e5e3fcb7517c825bc8047f60ef (git)
Affected: 84b7625728ea311ea35bdaa0eded53c1c56baeaa , < 52cecff98bda2c51eed1c6ce9d21c5d6268fb19d (git)
Affected: 84b7625728ea311ea35bdaa0eded53c1c56baeaa , < 27fdbab4221b375de54bf91919798d88520c6e28 (git)
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Linux Linux Affected: 4.13
Unaffected: 0 , < 4.13 (semver)
Unaffected: 5.10.254 , ≤ 5.10.* (semver)
Unaffected: 5.15.204 , ≤ 5.15.* (semver)
Unaffected: 6.1.170 , ≤ 6.1.* (semver)
Unaffected: 6.6.137 , ≤ 6.6.* (semver)
Unaffected: 6.12.85 , ≤ 6.12.* (semver)
Unaffected: 6.18.26 , ≤ 6.18.* (semver)
Unaffected: 7.0.3 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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            "url": "http://xenbits.xen.org/xsa/advisory-485.html"
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        |...B|\\n00000014\\n\\n(the above have a hack to embed a zero inside and check it\u0027s\\nreturned correctly).\\n\\nThis is XSA-485 / CVE-2026-31786\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/xen/sys-hypervisor.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"84b7625728ea311ea35bdaa0eded53c1c56baeaa\",\"lessThan\":\"e3af585e1728c917682b6a3de9a69b41fb9194d4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84b7625728ea311ea35bdaa0eded53c1c56baeaa\",\"lessThan\":\"8288d031a01dbacfde3fc643f7be3d23504de64d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84b7625728ea311ea35bdaa0eded53c1c56baeaa\",\"lessThan\":\"f458ba102da97fafca106327086fc95f3fc764cb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84b7625728ea311ea35bdaa0eded53c1c56baeaa\",\"lessThan\":\"4b4defd2fce3f966c25adabf46644a85558f1169\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84b7625728ea311ea35bdaa0eded53c1c56baeaa\",\"lessThan\":\"5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84b7625728ea311ea35bdaa0eded53c1c56baeaa\",\"lessThan\":\"d5f59216650c51e5e3fcb7517c825bc8047f60ef\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84b7625728ea311ea35bdaa0eded53c1c56baeaa\",\"lessThan\":\"52cecff98bda2c51eed1c6ce9d21c5d6268fb19d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84b7625728ea311ea35bdaa0eded53c1c56baeaa\",\"lessThan\":\"27fdbab4221b375de54bf91919798d88520c6e28\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/xen/sys-hypervisor.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.254\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.204\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.170\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.137\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.85\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.26\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.3\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.13\",\"versionEndExcluding\":\"5.10.254\",\"matchCriteriaId\":\"1493839B-26E7-4663-8942-B55262171032\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.204\",\"matchCriteriaId\":\"FA800016-0012-4E3F-A528-2A7F378A0A4A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.170\",\"matchCriteriaId\":\"E6653854-B188-42DD-B8C5-0143F1956AB1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.137\",\"matchCriteriaId\":\"3CA3EF52-168A-4348-8F5F-356C9EB69261\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.85\",\"matchCriteriaId\":\"F17D292D-A9B5-4DC7-8002-51AB95335606\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.26\",\"matchCriteriaId\":\"85751F83-26BA-498C-90E7-E38A59C4564D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.3\",\"matchCriteriaId\":\"C7C9A567-4F4F-4C61-BAD3-440B34C67118\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B1EF7059-E670-45F4-B422-54C40FA86390\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D38F0BF-A728-4133-A358-D44A2F7EE6D6\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/27fdbab4221b375de54bf91919798d88520c6e28\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4b4defd2fce3f966c25adabf46644a85558f1169\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/52cecff98bda2c51eed1c6ce9d21c5d6268fb19d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8288d031a01dbacfde3fc643f7be3d23504de64d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d5f59216650c51e5e3fcb7517c825bc8047f60ef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e3af585e1728c917682b6a3de9a69b41fb9194d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f458ba102da97fafca106327086fc95f3fc764cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/04/28/12\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"http://xenbits.xen.org/xsa/advisory-485.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-16T10:56:56+00:00",
      "cve": "CVE-2026-31786",
      "id": "CVE-2026-31786",
      "initial_release_date": "2026-04-30T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "64",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Buffer overflow in drivers/xen/sys-hypervisor.c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31786.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-07T17:07:30Z",
      "cve": "CVE-2026-31786",
      "id": "CVE-2026-31786",
      "initial_release_date": "2026-04-28T23:27:37Z",
      "product_status:known_affected": "24",
      "product_status:known_not_affected": "79",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31786",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31786.json",
      "version": "19"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.