CVE-2026-46294
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel, a buffer overflow was found in the retrieve_status function in the dm-ioctl driver. The bug is due to missing overflow check when aligning the outptr pointer to an 8-byte boundary, potentially leading to out-of-bounds write. However, the vulnerability has no security implications because only root can issue device mapper ioctls and libraries use 8-byte aligned buffers.
Risk Assessment
The risk is minimal because exploitation requires root privileges and typical libraries prevent accidental triggering. Nevertheless, under specific conditions memory corruption may occur.
Recommendation
Update the Linux kernel to a version containing the fix that adds overflow checking during pointer alignment in retrieve_status.
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Original NVD description (English source)
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