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Integer Underflow The advisory has been revoked - it doesn't affect any version of package kernel-modules-internal  (opens in a new tab)

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  • Snyk IDSNYK-RHEL10-KERNELMODULESINTERNAL-22097063
  • published31 Oct 2026
  • disclosed15 Aug 2026
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Introduced: 15 Aug 2026

CVE-2026-72367  (opens in a new tab)
CWE-191  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-modules-internal package and not the kernel-modules-internal package as distributed by RHEL.

In the Linux kernel, the following vulnerability has been resolved:

iomap: guard io_size EOF trim against concurrent truncate underflow

iomap: fix zero padding data issue in concurrent append writes changed ioend accounting so that io_size tracks only valid data within EOF. This trims io_size when a writeback range extends past end_pos:

ioend->io_size += map_len;
if (ioend->io_offset + ioend->io_size > end_pos)
    ioend->io_size = end_pos - ioend->io_offset;

However, if end_pos ends up below ioend->io_offset, the subtraction becomes negative and is stored in size_t io_size, causing an unsigned wrap to a huge value. This can happen when writeback continues past byte-level EOF up to a block-aligned range, or when a concurrent truncate shrinks the file after end_pos was sampled in iomap_writeback_handle_eof().

A wrapped io_size can mislead append detection and corrupt completion-time size handling, since filesystem end_io paths consume io_size for decisions such as on-disk EOF updates and unwritten/COW completion ranges.

Fix this by clamping io_size to zero when EOF has moved to or before the ioend start offset. This preserves the original intent of trimming io_size to valid in-EOF data while avoiding the underflow.