nilfs2: fix sysfs interface lifetime

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2023-53440
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-18 16:15:48 UTC
Updated2026-08-04 10:19:06 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nilfs2: fix sysfs interface lifetime The current nilfs2 sysfs support has issues with the timing of creation and deletion of sysfs entries, potentially leading to null pointer dereferences, use-after-free, and lockdep warnings. Some of the sysfs attributes for nilfs2 per-filesystem instance refer to metadata file "cpfile", "sufile", or "dat", but nilfs_sysfs_create_device_group that creates those attributes is executed before the inodes for these metadata files are loaded, and nilfs_sysfs_delete_device_group which deletes these sysfs entries is called after releasing their metadata file inodes. Therefore, access to some of these sysfs attributes may occur outside of the lifetime of these metadata files, resulting in inode NULL pointer dereferences or use-after-free. In addition, the call to nilfs_sysfs_create_device_group() is made during the locking period of the semaphore "ns_sem" of nilfs object, so the shrinker call caused by the memory allocation for the sysfs entries, may derive lock dependencies "ns_sem" -> (shrinker) -> "locks acquired in nilfs_evict_inode()". Since nilfs2 may acquire "ns_sem" deep in the call stack holding other locks via its error handler __nilfs_error(), this causes lockdep to report circular locking. This is a false positive and no circular locking actually occurs as no inodes exist yet when nilfs_sysfs_create_device_group() is called. Fortunately, the lockdep warnings can be resolved by simply moving the call to nilfs_sysfs_create_device_group() out of "ns_sem". This fixes these sysfs issues by revising where the device's sysfs interface is created/deleted and keeping its lifetime within the lifetime of the metadata files above.

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

Problem Types: CWE-476 | CWE-476 CWE-476 NULL Pointer Dereference

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-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected dd70edbde2627f47df118d899de6bbb55abcfdbf d20dcec8f326deb77b6688f8441e014045dac457 git Not specified
CNA Linux Linux affected dd70edbde2627f47df118d899de6bbb55abcfdbf 5fe0ea141fbb887d407f1bf572ebf24427480d5c git Not specified
CNA Linux Linux affected dd70edbde2627f47df118d899de6bbb55abcfdbf 83b16a60e413148685739635901937e2f16a7873 git Not specified
CNA Linux Linux affected dd70edbde2627f47df118d899de6bbb55abcfdbf 3dbee84bf9e3273c4bb9ca6fc18ff22fba23dd24 git Not specified
CNA Linux Linux affected dd70edbde2627f47df118d899de6bbb55abcfdbf d540aea451ab5489777a8156560f1388449b3109 git Not specified
CNA Linux Linux affected dd70edbde2627f47df118d899de6bbb55abcfdbf 1942ccb7d95f287a312fcbabfa8bc9ba501b1953 git Not specified
CNA Linux Linux affected dd70edbde2627f47df118d899de6bbb55abcfdbf daf4eb3a908b108279b60172d2f176e70d2df875 git Not specified
CNA Linux Linux affected dd70edbde2627f47df118d899de6bbb55abcfdbf 42560f9c92cc43dce75dbf06cc0d840dced39b12 git Not specified
CNA Linux Linux affected 3.17 Not specified
CNA Linux Linux unaffected 3.17 semver Not specified
CNA Linux Linux unaffected 4.14.313 4.14.* semver Not specified
CNA Linux Linux unaffected 4.19.281 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.241 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.178 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.107 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.24 6.1.* semver Not specified
CNA Linux Linux unaffected 6.2.11 6.2.* semver Not specified
CNA Linux Linux unaffected 6.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/42560f9c92cc43dce75dbf06cc0d840dced39b12 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3dbee84bf9e3273c4bb9ca6fc18ff22fba23dd24 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d540aea451ab5489777a8156560f1388449b3109 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/daf4eb3a908b108279b60172d2f176e70d2df875 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/83b16a60e413148685739635901937e2f16a7873 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5fe0ea141fbb887d407f1bf572ebf24427480d5c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1942ccb7d95f287a312fcbabfa8bc9ba501b1953 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d20dcec8f326deb77b6688f8441e014045dac457 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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