Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 6.6.136 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/41de342278ae025c99cc8d33648773f05e306cf1Patch
- https://git.kernel.org/stable/c/449ec5fc99f45974525ba9eea16b6670c45cd363Patch
- https://git.kernel.org/stable/c/4a4e0328edd9e9755843787d28f16dd4165f8b48Patch
- https://git.kernel.org/stable/c/7318e3549518ce8f14776a489d86488d80d7e2c8Patch
- https://git.kernel.org/stable/c/97fb7afec404912d967a7d4715f37742666b3084Patch
- https://git.kernel.org/stable/c/c36e206f302f1ddefed92d09ecbba070e1ae079ePatch
FAQ
What is CVE-2026-31577?
CVE-2026-31577 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 ini...
How severe is CVE-2026-31577?
CVE-2026-31577 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31577?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.