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.
Affected products
linux: linux kernel
References9
- git.kernel.org/stable/c/41de342278ae025c99cc8d33648773f05e306cf1 Patch
- git.kernel.org/stable/c/449ec5fc99f45974525ba9eea16b6670c45cd363 Patch
- git.kernel.org/stable/c/4a4e0328edd9e9755843787d28f16dd4165f8b48 Patch
- git.kernel.org/stable/c/7318e3549518ce8f14776a489d86488d80d7e2c8 Patch
- git.kernel.org/stable/c/97fb7afec404912d967a7d4715f37742666b3084 Patch
- git.kernel.org/stable/c/c36e206f302f1ddefed92d09ecbba070e1ae079e Patch
- git.kernel.org/stable/c/6637bbcfb59df5b732a79e5ab1a74886a0b93d59
- git.kernel.org/stable/c/7902b1df1520a0880bcda7a3704cfacd17905a83
- git.kernel.org/stable/c/837c7a59fb58f81b0db33848357f6a5d0d1250ad
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 2 · as of 13 November 2026
- CWE
- CWE-476
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