smb: client: fix OOB struct field reads in move_smb2_ea_to_cifs()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98170
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 09:17:58 UTC
Updated2026-10-06 09:17:58 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: smb: client: fix OOB struct field reads in move_smb2_ea_to_cifs() In move_smb2_ea_to_cifs(), the while (src_size > 0) loop condition is insufficient. It allows iteration to continue even if the remaining src_size is too small to contain a complete smb2_ea_info structure. Consequently, reads of ea_name_length and ea_value_length can occur out-of-bounds. Fix this by ensuring src_size >= sizeof(*src) before attempting to read any structure fields. Additionally, reject any next_entry_offset that is smaller than sizeof(*src) or that would advance the pointer beyond the available buffer. Note that for calls where the server returns a malformed EA list, the error returned to userspace changes from -ENODATA (getxattr) or -ERANGE (listxattr) to -EIO. This correctly signals a server protocol error rather than misleadingly indicating "attribute not present" or "output buffer too small".

Risk And Classification

EPSS: 0.002090000 probability, percentile 0.100330000 (date 2026-10-06)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 95907fea4fd8ccc736e0a428e52159b4d42b9958 d3546cecbf81d98bf3b472d341f981eb48c04f47 git Not specified
CNA Linux Linux affected 95907fea4fd8ccc736e0a428e52159b4d42b9958 34a3942e787b9c59758115bd65fe1ec89d68c7a4 git Not specified
CNA Linux Linux affected 95907fea4fd8ccc736e0a428e52159b4d42b9958 13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca git Not specified
CNA Linux Linux affected 95907fea4fd8ccc736e0a428e52159b4d42b9958 eeb5ef6083e1cefa2ef75041b5597ff228b8d7bb git Not specified
CNA Linux Linux affected 4.14 Not specified
CNA Linux Linux unaffected 4.14 semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.54 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.8 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/34a3942e787b9c59758115bd65fe1ec89d68c7a4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eeb5ef6083e1cefa2ef75041b5597ff228b8d7bb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d3546cecbf81d98bf3b472d341f981eb48c04f47 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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