CVE-2026-31577 (GCVE-0-2026-31577)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-27 13:56
VLAI?
Title
nilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map
Summary
In 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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e897be17a441fa637cd166fc3de1445131e57692 , < 7318e3549518ce8f14776a489d86488d80d7e2c8 (git)
Affected: e897be17a441fa637cd166fc3de1445131e57692 , < 449ec5fc99f45974525ba9eea16b6670c45cd363 (git)
Affected: e897be17a441fa637cd166fc3de1445131e57692 , < c36e206f302f1ddefed92d09ecbba070e1ae079e (git)
Affected: e897be17a441fa637cd166fc3de1445131e57692 , < 41de342278ae025c99cc8d33648773f05e306cf1 (git)
Affected: e897be17a441fa637cd166fc3de1445131e57692 , < 97fb7afec404912d967a7d4715f37742666b3084 (git)
Affected: e897be17a441fa637cd166fc3de1445131e57692 , < 4a4e0328edd9e9755843787d28f16dd4165f8b48 (git)
Affected: 6c3da8c0a35bbafe359d9166269d5590f29664de (git)
Affected: 605babb979c213737618b1c837e89624e5ab11fd (git)
Affected: 307d021b1a7f33048b624f7aaeaa75e3eae571f1 (git)
Affected: d626fcdabea2258be395a775bdbe09270e9bf73d (git)
Affected: d05cc5395e36711edad8bdef6945f138d8a7097b (git)
Affected: 1829b24a36ca12ca95b96d5478faeff40c17f2b6 (git)
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    Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)
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  }
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
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