CVE-2026-31787
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)
xen/privcmd: fix double free via VMA splitting
In the Linux kernel, the following vulnerability has been resolved: xen/privcmd: fix double free via VMA splitting privcmd_vm_ops defines .close (privcmd_close), but neither .may_split nor .open. When userspace does a partial munmap() on a privcmd mapping, the kernel splits the VMA via __split_vma(). Since may_split is NULL, the split is allowed. vm_area_dup() copies vm_private_data (a pages array allocated in alloc_empty_pages()) into the new VMA without any fixup, because there is no .open callback. Both VMAs now point to the same pages array. When the unmapped portion is closed, privcmd_close() calls: - xen_unmap_domain_gfn_range() - xen_free_unpopulated_pages() - kvfree(pages) The surviving VMA still holds the dangling pointer. When it is later destroyed, the same sequence runs again, which leads to a double free. Fix this issue by adding a .may_split callback denying the VMA split. This is XSA-487 / CVE-2026-31787
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) |
|---|---|---|---|---|---|
| d71f513985c22f1050295d1a7e4327cf9fb060da | affected | git | dbf862ce9f009128ab86b234d91413a3e450beb4 | Unavailable | None listed |
| d71f513985c22f1050295d1a7e4327cf9fb060da | affected | git | 2b985d3a024b9e8c24e21671b34e855569763808 | Unavailable | None listed |
| d71f513985c22f1050295d1a7e4327cf9fb060da | affected | git | 1576ff3869cbd3620717195f971c85b7d7fd62b5 | Unavailable | None listed |
| d71f513985c22f1050295d1a7e4327cf9fb060da | affected | git | 402d84ad9e89bd4cbfd07ca8598532b7021daf95 | Unavailable | None listed |
| d71f513985c22f1050295d1a7e4327cf9fb060da | affected | git | 2894a351fe2ea8684919d36df3188b9a35e3926f | Unavailable | None listed |
| d71f513985c22f1050295d1a7e4327cf9fb060da | affected | git | 446ee446d9ae66f36e95c3c90bbcc4e56b94cde0 | Unavailable | None listed |
| d71f513985c22f1050295d1a7e4327cf9fb060da | affected | git | 71bf829800758a6e3889096e4754ef47ba7fc850 | Unavailable | None listed |
| d71f513985c22f1050295d1a7e4327cf9fb060da | affected | git | 24daca4fc07f3ff8cd0e3f629cd982187f48436a | 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) |
|---|---|---|---|---|---|
| 3.8 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 3.8 | 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 |