CVE-2026-46294
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.14%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.14% probability · 4th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/2fa49cc884f6496a915c35621ba4da35649bf159Patch
- https://git.kernel.org/stable/c/448ee8fb79c26a26599ffa4b2adeb4322d3d3d8cPatch
- https://git.kernel.org/stable/c/526ff9126a0ae087b65726e1faf31114c718020dPatch
- https://git.kernel.org/stable/c/5af6a879e915ae7bcd83695c316ebb32e1c61bc2Patch
- https://git.kernel.org/stable/c/8daa6c708ef524089ae43f2aed9190acb26d7df8Patch
- https://git.kernel.org/stable/c/c8c5311237448f6ffeecc9aec2362e3692623668Patch
- https://git.kernel.org/stable/c/d271631023cbe1cbe7c31a0275ab797883be6e0aPatch
- https://git.kernel.org/stable/c/f0b0b09d9840838ae77ccdd6a62de0daef4e6e0aPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.