CVE-2026-46107
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)
dm-thin: fix metadata refcount underflow
In the Linux kernel, the following vulnerability has been resolved: dm-thin: fix metadata refcount underflow There's a bug in dm-thin in the function rebalance_children. If the internal btree node has one entry, the code tries to copy all btree entries from the node's child to the node itself and then decrement the child's reference count. If the child node is shared (it has reference count > 1), we won't free it, so there would be two pointers to each of the grandchildren nodes. But the reference counts of the grandchildren is not increased, thus the reference count doesn't match the number of pointers that point to the grandchildren. This results in "device mapper: space map common: unable to decrement block" errors. Fix this bug by incrementing reference counts on the grandchildren if the btree node is shared.
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) |
|---|---|---|---|---|---|
| 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 | affected | git | b719d12cb94df345e9ad2715fd0abe9afcaeb111 | Unavailable | None listed |
| 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 | affected | git | f49b41c9eb7c6ff00df27cd49cea210abbadd8ad | Unavailable | None listed |
| 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 | affected | git | f06f6aededd792a754cd677c02b3d3016d868c2c | Unavailable | None listed |
| 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 | affected | git | 12161e03d33afce781f68fa11cc6060538862fad | Unavailable | None listed |
| 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 | affected | git | 323d252a4a378834e4fe68298ca61cfc5dd3a460 | Unavailable | None listed |
| 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 | affected | git | 85311a585a26640760cd0f3349ab9f2905691044 | Unavailable | None listed |
| 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 | affected | git | 5ec0debbcfd43596e32c1239e993de06a704e04c | Unavailable | None listed |
| 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 | affected | git | 09a65adc7d8bbfce06392cb6d375468e2728ead5 | 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) |
|---|---|---|---|---|---|
| 3.2 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 3.2 | Unavailable | None listed |
| 5.10.259 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.209 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.175 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.140 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.88 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.30 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.0.7 | unaffected | semver | Unavailable | 7.0.* | None listed |
| 7.1 | unaffected | original_commit_for_fix | Unavailable | * | None listed |