Revert "libfs: fix infinite directory reads for offset dir"

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-57952
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-02-12 14:15:31 UTC
Updated2026-08-04 11:22:32 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Revert "libfs: fix infinite directory reads for offset dir" The current directory offset allocator (based on mtree_alloc_cyclic) stores the next offset value to return in octx->next_offset. This mechanism typically returns values that increase monotonically over time. Eventually, though, the newly allocated offset value wraps back to a low number (say, 2) which is smaller than other already- allocated offset values. Yu Kuai <[email protected]> reports that, after commit 64a7ce76fb90 ("libfs: fix infinite directory reads for offset dir"), if a directory's offset allocator wraps, existing entries are no longer visible via readdir/getdents because offset_readdir() stops listing entries once an entry's offset is larger than octx->next_offset. These entries vanish persistently -- they can be looked up, but will never again appear in readdir(3) output. The reason for this is that the commit treats directory offsets as monotonically increasing integer values rather than opaque cookies, and introduces this comparison: if (dentry2offset(dentry) >= last_index) { On 64-bit platforms, the directory offset value upper bound is 2^63 - 1. Directory offsets will monotonically increase for millions of years without wrapping. On 32-bit platforms, however, LONG_MAX is 2^31 - 1. The allocator can wrap after only a few weeks (at worst). Revert commit 64a7ce76fb90 ("libfs: fix infinite directory reads for offset dir") to prepare for a fix that can work properly on 32-bit systems and might apply to recent LTS kernels where shmem employs the simple_offset mechanism.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.002130000 probability, percentile 0.117480000 (date 2026-08-04)

Problem Types: NVD-CWE-noinfo | CWE-noinfo Not enough information

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1ADPDECLARED5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All
Operating System Linux Linux Kernel 6.13 - All All
Operating System Linux Linux Kernel 6.13 rc1 All All
Operating System Linux Linux Kernel 6.13 rc2 All All
Operating System Linux Linux Kernel 6.13 rc3 All All
Operating System Linux Linux Kernel 6.13 rc4 All All
Operating System Linux Linux Kernel 6.13 rc5 All All
Operating System Linux Linux Kernel 6.13 rc6 All All
Operating System Linux Linux Kernel 6.13 rc7 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 64a7ce76fb901bf9f9c36cf5d681328fc0fd4b5a 9e9e710f68bac49bd9b587823c077d06363440e0 git Not specified
CNA Linux Linux affected 64a7ce76fb901bf9f9c36cf5d681328fc0fd4b5a 3f250b82040a72b0059ae00855a74d8570ad2147 git Not specified
CNA Linux Linux affected 64a7ce76fb901bf9f9c36cf5d681328fc0fd4b5a b662d858131da9a8a14e68661656989b14dbf113 git Not specified
CNA Linux Linux affected 308b4fc2403b335894592ee9dc212a5e58bb309f git Not specified
CNA Linux Linux affected 6.10.7 6.11 semver Not specified
CNA Linux Linux affected 6.11 Not specified
CNA Linux Linux unaffected 6.11 semver Not specified
CNA Linux Linux unaffected 6.12.12 6.12.* semver Not specified
CNA Linux Linux unaffected 6.13.1 6.13.* semver Not specified
CNA Linux Linux unaffected 6.14 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3f250b82040a72b0059ae00855a74d8570ad2147 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b662d858131da9a8a14e68661656989b14dbf113 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9e9e710f68bac49bd9b587823c077d06363440e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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