nilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map

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Summary

CVECVE-2026-31577
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:32 UTC
Updated2026-04-27 20:41:46 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map The DAT inode's btree node cache (i_assoc_inode) is initialized lazily during btree operations. However, nilfs_mdt_save_to_shadow_map() assumes i_assoc_inode is already initialized when copying dirty pages to the shadow map during GC. If NILFS_IOCTL_CLEAN_SEGMENTS is called immediately after mount before any btree operation has occurred on the DAT inode, i_assoc_inode is NULL leading to a general protection fault. Fix this by calling nilfs_attach_btree_node_cache() on the DAT inode in nilfs_dat_read() at mount time, ensuring i_assoc_inode is always initialized before any GC operation can use it.

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: 0.000180000 probability, percentile 0.048130000 (date 2026-04-27)

Problem Types: CWE-476

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 e897be17a441fa637cd166fc3de1445131e57692 7318e3549518ce8f14776a489d86488d80d7e2c8 git Not specified
CNA Linux Linux affected e897be17a441fa637cd166fc3de1445131e57692 449ec5fc99f45974525ba9eea16b6670c45cd363 git Not specified
CNA Linux Linux affected e897be17a441fa637cd166fc3de1445131e57692 c36e206f302f1ddefed92d09ecbba070e1ae079e git Not specified
CNA Linux Linux affected e897be17a441fa637cd166fc3de1445131e57692 41de342278ae025c99cc8d33648773f05e306cf1 git Not specified
CNA Linux Linux affected e897be17a441fa637cd166fc3de1445131e57692 97fb7afec404912d967a7d4715f37742666b3084 git Not specified
CNA Linux Linux affected e897be17a441fa637cd166fc3de1445131e57692 4a4e0328edd9e9755843787d28f16dd4165f8b48 git Not specified
CNA Linux Linux affected 6c3da8c0a35bbafe359d9166269d5590f29664de git Not specified
CNA Linux Linux affected 605babb979c213737618b1c837e89624e5ab11fd git Not specified
CNA Linux Linux affected 307d021b1a7f33048b624f7aaeaa75e3eae571f1 git Not specified
CNA Linux Linux affected d626fcdabea2258be395a775bdbe09270e9bf73d git Not specified
CNA Linux Linux affected d05cc5395e36711edad8bdef6945f138d8a7097b git Not specified
CNA Linux Linux affected 1829b24a36ca12ca95b96d5478faeff40c17f2b6 git Not specified
CNA Linux Linux affected 5.18 Not specified
CNA Linux Linux unaffected 5.18 semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c36e206f302f1ddefed92d09ecbba070e1ae079e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/449ec5fc99f45974525ba9eea16b6670c45cd363 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7318e3549518ce8f14776a489d86488d80d7e2c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/97fb7afec404912d967a7d4715f37742666b3084 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4a4e0328edd9e9755843787d28f16dd4165f8b48 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/41de342278ae025c99cc8d33648773f05e306cf1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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