Integer Overflow or Wraparound Affecting rv package, versions *


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (13th percentile)

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  • Snyk IDSNYK-RHEL10-RV-17244899
  • published9 Jun 2026
  • disclosed8 Jun 2026

Introduced: 8 Jun 2026

NewCVE-2026-46294  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:10 rv.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rv package and not the rv package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

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 Base Scores

version 3.1