CVE-2026-72105dm-log: fix a bitset_size overflow on 32bit machines
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: dm-log: fix a bitset_size overflow on 32bit machines Commit c20e36b7631d ("dm log: fix out-of-bounds write due to region_count overflow") made sure that region_count could fit in an unsigned int. But the bitmap memory isn't allocated based on region_count. It uses bitset_size (a size_t variable). The first step of calculating bitset_size is to set it to region_count, rounded up to a multiple of BITS_PER_LONG. If region_size is less than BITS_PER_LONG smaller than UINT_MAX, it will get rounded up to 2^32. On a 32bit architecture, this will make bitset_size wrap around to 0 and fail, despite region_count being valid. Since bitset_size gets divided by 8, it can hold any valid region_count. It just needs a special case to handle the rollover. If it is 0, the value rolled over, and bitset size should be set to the number of bytes needed to hold 2^32 bits.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 44ab8875ae4a2842bde2d756bed195d375e0debb – < cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5
- affected defe483e47173768c227532694dc78cb65db5f09 – < 4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723
- affected 3ec74da927b4e171a6fc0e77b1188ba4d019af51 – < 567602fa72d57169365cbc589e0b8c3be900636d
- affected d4ac87567f86a55c3c92e9a5144dcd943a9772a1 – < d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a
- affected 12bd5b88e91a02785244ff1d20fb157e96e9cdc8 – < 1c3412b584e1fb6c665ff33ba7259253bc0082cb
- affected b455903eed4558982be0811f5b7f44f6bbc4ff57 – < e0b0163a65758ec3a2361ae1cea407898c27f21e
- affected c20e36b7631d83e7535877f08af8b0af72c44b1a – < 79feb87ab2396d49b9b65e4bb815d33cc71cba47
- affected c20e36b7631d83e7535877f08af8b0af72c44b1a – < 9743132a41f4d9d0e54c5f2adcb821b04796bab1
- affected 4ec8323b9f0764a14d532b1ae9b87f8a9fecb867
- affected 5.10.258 – < 5.10.261
- affected 5.15.209 – < 5.15.212
- affected 6.1.175 – < 6.1.178
- affected 6.6.141 – < 6.6.145
- affected 6.12.91 – < 6.12.97
- affected 6.18.33 – < 6.18.40
- affected 7.0.10 – < 7.1
- affected 7.1
- unaffected < 7.1
- unaffected 5.10.261 – ≤ 5.10.*
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5 (opens in a new tab)
- https://git.kernel.org/stable/c/4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723 (opens in a new tab)
- https://git.kernel.org/stable/c/567602fa72d57169365cbc589e0b8c3be900636d (opens in a new tab)
- https://git.kernel.org/stable/c/d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a (opens in a new tab)
- https://git.kernel.org/stable/c/1c3412b584e1fb6c665ff33ba7259253bc0082cb (opens in a new tab)
- https://git.kernel.org/stable/c/e0b0163a65758ec3a2361ae1cea407898c27f21e (opens in a new tab)
- https://git.kernel.org/stable/c/79feb87ab2396d49b9b65e4bb815d33cc71cba47 (opens in a new tab)
- https://git.kernel.org/stable/c/9743132a41f4d9d0e54c5f2adcb821b04796bab1 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-59063 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-72105)Record last updated .