smb/client: validate new EOF for zero range

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98126
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:43 UTC
Updated2026-09-30 14:10:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: smb/client: validate new EOF for zero range When FALLOC_FL_ZERO_RANGE is used without FALLOC_FL_KEEP_SIZE, smb3_zero_range() may extend EOF without checking RLIMIT_FSIZE, allowing the file to grow beyond the caller's file-size limit. Fix this by calling inode_newsize_ok() before sending the zero-range request when the operation would extend EOF. Reproducer, using a file on a CIFS mount: bash -c ' FILE=/mnt/cifs/repro trap "" SIGXFSZ ulimit -f 3072 truncate -s 2M "$FILE" fallocate --zero-range -o 0 -l 4M "$FILE" echo "fallocate rc=$?" stat -c "file size=%s" "$FILE" ' Before this change, the operation succeeds despite the 3 MiB limit: fallocate rc=0 file size=4194304 After this change, fallocate fails and leaves the file at 2 MiB.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.054660000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 72c419d9b073628d3b5b0b2fc787b724f1a8c726 3673f057b64abfa957e8ae84448db69369a5091a git Not specified
CNA Linux Linux affected 72c419d9b073628d3b5b0b2fc787b724f1a8c726 06a4f9049cb6dc319bceec2dc813ba89add8b828 git Not specified
CNA Linux Linux affected 72c419d9b073628d3b5b0b2fc787b724f1a8c726 f320ca20c273a26cd779bdb2b2e4b076a95c76f6 git Not specified
CNA Linux Linux affected 72c419d9b073628d3b5b0b2fc787b724f1a8c726 88972e35750792e717af287dc71f42a03b5cbce4 git Not specified
CNA Linux Linux affected 5.1 Not specified
CNA Linux Linux unaffected 5.1 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/06a4f9049cb6dc319bceec2dc813ba89add8b828 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3673f057b64abfa957e8ae84448db69369a5091a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/88972e35750792e717af287dc71f42a03b5cbce4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f320ca20c273a26cd779bdb2b2e4b076a95c76f6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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