f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show()

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Summary

CVECVE-2026-53303
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-26 20:17:23 UTC
Updated2026-07-06 20:24:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show() In f2fs_sbi_show(), the extension_list, extension_count and hot_ext_count are read without holding sbi->sb_lock. If a concurrent sysfs store modifies the extension list via f2fs_update_extension_list(), the show path may read inconsistent count and array contents, potentially leading to out-of-bounds access or displaying stale data. Fix this by holding sb_lock around the entire extension list read and format operation.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.001720000 probability, percentile 0.068850000 (date 2026-07-04)

Problem Types: CWE-125

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b6a06cbbb5f7fd03589cff9178314af04c568826 d3ff0c121bbaef026df6248ab7ef6f0b068b0647 git Not specified
CNA Linux Linux affected b6a06cbbb5f7fd03589cff9178314af04c568826 cea15f66b7b68b2c50943a6660e0692c6635e4eb git Not specified
CNA Linux Linux affected b6a06cbbb5f7fd03589cff9178314af04c568826 4b3a1bf4c2ffd4c9595d900ead78c9035894a025 git Not specified
CNA Linux Linux affected b6a06cbbb5f7fd03589cff9178314af04c568826 d0e877810baf613b018fd9747440b9d4d9db1428 git Not specified
CNA Linux Linux affected b6a06cbbb5f7fd03589cff9178314af04c568826 ea3ab43a1f3cf2c7cecd75c8be1ee99a5e94a92e git Not specified
CNA Linux Linux affected b6a06cbbb5f7fd03589cff9178314af04c568826 5909bedbed38c558bee7cb6758ceedf9bc3a9194 git Not specified
CNA Linux Linux affected 4.17 Not specified
CNA Linux Linux unaffected 4.17 semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ea3ab43a1f3cf2c7cecd75c8be1ee99a5e94a92e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4b3a1bf4c2ffd4c9595d900ead78c9035894a025 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d3ff0c121bbaef026df6248ab7ef6f0b068b0647 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d0e877810baf613b018fd9747440b9d4d9db1428 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cea15f66b7b68b2c50943a6660e0692c6635e4eb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5909bedbed38c558bee7cb6758ceedf9bc3a9194 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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