CVE-2026-46294dm: fix a buffer overflow in ioctl processing
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- CVSS
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before c8c5311237448f6ffeecc9aec2362e3692623668; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 526ff9126a0ae087b65726e1faf31114c718020d; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before d271631023cbe1cbe7c31a0275ab797883be6e0a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5af6a879e915ae7bcd83695c316ebb32e1c61bc2; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8daa6c708ef524089ae43f2aed9190acb26d7df8; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2fa49cc884f6496a915c35621ba4da35649bf159 | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.12.1 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7; 2.6.12; and 4 more ranges | NVD |
References
- https://git.kernel.org/stable/c/c8c5311237448f6ffeecc9aec2362e3692623668patch
- https://git.kernel.org/stable/c/448ee8fb79c26a26599ffa4b2adeb4322d3d3d8cpatch
- https://git.kernel.org/stable/c/526ff9126a0ae087b65726e1faf31114c718020dpatch
- https://git.kernel.org/stable/c/f0b0b09d9840838ae77ccdd6a62de0daef4e6e0apatch
- https://git.kernel.org/stable/c/d271631023cbe1cbe7c31a0275ab797883be6e0apatch
- https://git.kernel.org/stable/c/5af6a879e915ae7bcd83695c316ebb32e1c61bc2patch
- https://git.kernel.org/stable/c/8daa6c708ef524089ae43f2aed9190acb26d7df8patch
- https://git.kernel.org/stable/c/2fa49cc884f6496a915c35621ba4da35649bf159patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.