CVE-2026-46294dm: fix a buffer overflow in ioctl processing
- 7.8HighCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 96% 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: fix a buffer overflow in ioctl processing Tony Asleson (using Claude) found a buffer overflow in dm-ioctl in the function retrieve_status: 1. The code in retrieve_status checks that the output string fits into the output buffer and writes the output string there 2. Then, the code aligns the "outptr" variable to the next 8-byte boundary: outptr = align_ptr(outptr); 3. The alignment doesn't check overflow, so outptr could point past the buffer end 4. The "for" loop is iterated again, it executes: remaining = len - (outptr - outbuf); 5. If "outptr" points past "outbuf + len", the arithmetics wraps around and the variable "remaining" contains unusually high number 6. With "remaining" being high, the code writes more data past the end of the buffer Luckily, this bug has no security implications because: 1. Only root can issue device mapper ioctls 2. The commonly used libraries that communicate with device mapper (libdevmapper and devicemapper-rs) use buffer size that is aligned to 8 bytes - thus, "outptr = align_ptr(outptr)" can't overshoot the input buffer and the bug can't happen accidentally
Timeline
ID reserved
By Linux
- 26 days later
· 26 days later
Published
- 5 months later
· 5 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 |
|---|---|---|---|
| NVDNVD · Modified | 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)
- 0.14% · top 96% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < c8c5311237448f6ffeecc9aec2362e3692623668
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 526ff9126a0ae087b65726e1faf31114c718020d
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < d271631023cbe1cbe7c31a0275ab797883be6e0a
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 5af6a879e915ae7bcd83695c316ebb32e1c61bc2
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 8daa6c708ef524089ae43f2aed9190acb26d7df8
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 2fa49cc884f6496a915c35621ba4da35649bf159
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.140 – ≤ 6.6.*
- unaffected 6.12.88 – ≤ 6.12.*
- unaffected 6.18.30 – ≤ 6.18.*
- unaffected 7.0.7 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References9
- https://git.kernel.org/stable/c/c8c5311237448f6ffeecc9aec2362e3692623668 (opens in a new tab)
- https://git.kernel.org/stable/c/448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c (opens in a new tab)
- https://git.kernel.org/stable/c/526ff9126a0ae087b65726e1faf31114c718020d (opens in a new tab)
- https://git.kernel.org/stable/c/f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a (opens in a new tab)
- https://git.kernel.org/stable/c/d271631023cbe1cbe7c31a0275ab797883be6e0a (opens in a new tab)
- https://git.kernel.org/stable/c/5af6a879e915ae7bcd83695c316ebb32e1c61bc2 (opens in a new tab)
- https://git.kernel.org/stable/c/8daa6c708ef524089ae43f2aed9190acb26d7df8 (opens in a new tab)
- https://git.kernel.org/stable/c/2fa49cc884f6496a915c35621ba4da35649bf159 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (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-2026-35160 (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-2026-46294)Record last updated .