CVE-2026-97927ufs: create the root dentry after loading cylinder metadata
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 89% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: ufs: create the root dentry after loading cylinder metadata ufs_fill_super() installed sb->s_root before it loaded the cylinder group structures for a writable mount: sb->s_root = d_make_root(inode); ... if (!sb_rdonly(sb)) if (!ufs_read_cylinder_structures(sb)) goto failed; When ufs_read_cylinder_structures() failed, the error path freed the in-core superblock information and set sb->s_fs_info to NULL while sb->s_root stayed installed. get_tree_bdev() then reached deactivate_locked_super(), and because s_root was present, generic_shutdown_super() called sync_filesystem() and the put_super operation. Both dereference UFS_SB(sb), which is now NULL, so a mount that fails only while reading the cylinder groups oopses during teardown. A crafted image whose first cylinder group cannot be read reaches this path. Load the cylinder group metadata first and create the root dentry last, so the superblock is published to the VFS only once it is fully set up. ufs_setup_cstotal() and ufs_read_cylinder_structures() take only the super_block and do not use the root inode, so the reordering is safe.
Timeline
ID reserved
By Linux
Published
- 24 days later
· 24 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < e58db6c2dce6e453dca26c3a4953002425201880
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 05360c6eb8388bb5adac3c439ffb1512de39550a
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 5cc48633fb76196b596a449ba1f4f642ad6125ce
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < cd21f1ff74b1c15077fa3b98e80da3b41055aae4
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < a9804121d55aaa4319c1cac00b99794aa177dd6a
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 785e523b6c1931d802cab9f85912f3e6c7028af1
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 8173e051a8acbb4ae6547be0436727944119e0b5
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 55a4c98abb9694b067c6a031d11501f06b6b523c
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.10.271 – ≤ 5.10.*
- unaffected 5.15.222 – ≤ 5.15.*
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.2.7 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/e58db6c2dce6e453dca26c3a4953002425201880 (opens in a new tab)
- https://git.kernel.org/stable/c/05360c6eb8388bb5adac3c439ffb1512de39550a (opens in a new tab)
- https://git.kernel.org/stable/c/5cc48633fb76196b596a449ba1f4f642ad6125ce (opens in a new tab)
- https://git.kernel.org/stable/c/cd21f1ff74b1c15077fa3b98e80da3b41055aae4 (opens in a new tab)
- https://git.kernel.org/stable/c/a9804121d55aaa4319c1cac00b99794aa177dd6a (opens in a new tab)
- https://git.kernel.org/stable/c/785e523b6c1931d802cab9f85912f3e6c7028af1 (opens in a new tab)
- https://git.kernel.org/stable/c/8173e051a8acbb4ae6547be0436727944119e0b5 (opens in a new tab)
- https://git.kernel.org/stable/c/55a4c98abb9694b067c6a031d11501f06b6b523c (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-86781 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-97927)Record last updated .