ext4: fix bounds check in check_xattrs() to prevent out-of-bounds access

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Summary

CVECVE-2026-46094
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:30 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ext4: fix bounds check in check_xattrs() to prevent out-of-bounds access The bounds check for the next xattr entry in check_xattrs() uses (void *)next >= end, which allows next to point within sizeof(u32) bytes of end. On the next loop iteration, IS_LAST_ENTRY() reads 4 bytes via *(__u32 *)(entry), which can overrun the valid xattr region. For example, if next lands at end - 1, the check passes since next < end, but IS_LAST_ENTRY() reads 4 bytes starting at end - 1, accessing 3 bytes beyond the valid region. Fix this by changing the check to (void *)next + sizeof(u32) > end, ensuring there is always enough space for the IS_LAST_ENTRY() read on the subsequent iteration.

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.051380000 (date 2026-05-31)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3478c83cf26bbffd026ae6a56bcb1fe544f0834e ab6da97bc310db35d4e4ef5354bc3ff626b0698c git Not specified
CNA Linux Linux affected 3478c83cf26bbffd026ae6a56bcb1fe544f0834e 5a5314d2387633a272a04d1bd8727f99058e4e68 git Not specified
CNA Linux Linux affected 3478c83cf26bbffd026ae6a56bcb1fe544f0834e 537e065977022aa22f2c2503e8accaf16622e0fd git Not specified
CNA Linux Linux affected 3478c83cf26bbffd026ae6a56bcb1fe544f0834e 520986722dbf869c122252123fc161c7302eab7d git Not specified
CNA Linux Linux affected 3478c83cf26bbffd026ae6a56bcb1fe544f0834e eceafc31ea7b42c984ece10d79d505c0bb6615d5 git Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ab6da97bc310db35d4e4ef5354bc3ff626b0698c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/520986722dbf869c122252123fc161c7302eab7d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eceafc31ea7b42c984ece10d79d505c0bb6615d5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/537e065977022aa22f2c2503e8accaf16622e0fd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5a5314d2387633a272a04d1bd8727f99058e4e68 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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