CVE-2026-31786
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
Buffer overflow in drivers/xen/sys-hypervisor.c
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
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 84b7625728ea311ea35bdaa0eded53c1c56baeaa | affected | git | e3af585e1728c917682b6a3de9a69b41fb9194d4 | Unavailable | None listed |
| 84b7625728ea311ea35bdaa0eded53c1c56baeaa | affected | git | 8288d031a01dbacfde3fc643f7be3d23504de64d | Unavailable | None listed |
| 84b7625728ea311ea35bdaa0eded53c1c56baeaa | affected | git | f458ba102da97fafca106327086fc95f3fc764cb | Unavailable | None listed |
| 84b7625728ea311ea35bdaa0eded53c1c56baeaa | affected | git | 4b4defd2fce3f966c25adabf46644a85558f1169 | Unavailable | None listed |
| 84b7625728ea311ea35bdaa0eded53c1c56baeaa | affected | git | 5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a | Unavailable | None listed |
| 84b7625728ea311ea35bdaa0eded53c1c56baeaa | affected | git | d5f59216650c51e5e3fcb7517c825bc8047f60ef | Unavailable | None listed |
| 84b7625728ea311ea35bdaa0eded53c1c56baeaa | affected | git | 52cecff98bda2c51eed1c6ce9d21c5d6268fb19d | Unavailable | None listed |
| 84b7625728ea311ea35bdaa0eded53c1c56baeaa | affected | git | 27fdbab4221b375de54bf91919798d88520c6e28 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.13 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.13 | Unavailable | None listed |
| 5.10.254 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.204 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.170 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.137 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.85 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.26 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.0.3 | unaffected | semver | Unavailable | 7.0.* | None listed |
| 7.1 | unaffected | original_commit_for_fix | Unavailable | * | None listed |