Vulnerability-Lookup

FKIE_CVE-2026-31786

Vulnerability from fkie_nvd - Published: 2026-04-30 11:16 - Updated: 2026-05-06 19:44

Severity ?

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/27fdbab4221b375de54bf91919798d88520c6e28	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4b4defd2fce3f966c25adabf46644a85558f1169	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/52cecff98bda2c51eed1c6ce9d21c5d6268fb19d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8288d031a01dbacfde3fc643f7be3d23504de64d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d5f59216650c51e5e3fcb7517c825bc8047f60ef	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e3af585e1728c917682b6a3de9a69b41fb9194d4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f458ba102da97fafca106327086fc95f3fc764cb	Patch
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/04/28/12	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://xenbits.xen.org/xsa/advisory-485.html	Mailing List, Third Party Advisory

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.1
linux	linux_kernel	7.1

JSON

To clipboard

{
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  "id": "CVE-2026-31786",
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}

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

Vulnerability from cvelistv5 – Published: 2026-04-30 10:31 – Updated: 2026-05-04 07:46

Title

Buffer overflow in drivers/xen/sys-hypervisor.c

Summary

Severity ?

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/e3af585e1728c9176…
	https://git.kernel.org/stable/c/8288d031a01dbacfd…
	https://git.kernel.org/stable/c/f458ba102da97fafc…
	https://git.kernel.org/stable/c/4b4defd2fce3f966c…
	https://git.kernel.org/stable/c/5c5ff7c7bd15bb536…
	https://git.kernel.org/stable/c/d5f59216650c51e5e…
	https://git.kernel.org/stable/c/52cecff98bda2c51e…
	https://git.kernel.org/stable/c/27fdbab4221b375de…

Impacted products

Vendor

Product

Version

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)

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-rc2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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            "url": "http://xenbits.xen.org/xsa/advisory-485.html"
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        },
        {
          "url": "https://git.kernel.org/stable/c/5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d5f59216650c51e5e3fcb7517c825bc8047f60ef"
        },
        {
          "url": "https://git.kernel.org/stable/c/52cecff98bda2c51eed1c6ce9d21c5d6268fb19d"
        },
        {
          "url": "https://git.kernel.org/stable/c/27fdbab4221b375de54bf91919798d88520c6e28"
        }
      ],
      "title": "Buffer overflow in drivers/xen/sys-hypervisor.c",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31786",
    "datePublished": "2026-04-30T10:31:28.293Z",
    "dateReserved": "2026-03-09T15:48:24.141Z",
    "dateUpdated": "2026-05-04T07:46:40.378Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

FKIE_CVE-2026-31786

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

Tags

Sightings

Nomenclature