ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.13 % · percentile 2 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Modified
Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY filemap_fault() may drop the mmap_lock before returning VM_FAULT_RETRY, as documented in mm/filemap.c: "If our return value has VM_FAULT_RETRY set, it's because the mmap_lock may be dropped before doing I/O or by lock_folio_maybe_drop_mmap()." When this happens, a concurrent munmap() can call remove_vma() and free the vm_area_struct via RCU. The saved 'vma' pointer in ocfs2_fault() then becomes a dangling pointer, and the subsequent trace_ocfs2_fault() call dereferences it -- a use-after-free. Fix this by saving ip_blkno as a plain integer before calling filemap_fault(), and removing vma from the trace event. Since ip_blkno is copied by value before the lock can be dropped, it remains valid regardless of what happens to the vma or inode afterward.
Weaknesses (CWE)
- CWE-416 — Use After Free
References
- https://git.kernel.org/stable/c/36539c4d536f851a3b346a6ebb27b51bc3d77a94
- https://git.kernel.org/stable/c/35c2c05261d6f6d84aaa1355afa201d507943e76
- https://git.kernel.org/stable/c/3f5e74b5db9353b01ed50f4de84e75b755f8fbc2
- https://git.kernel.org/stable/c/6f072daefcab1d84ce37c073645615f63be91006
- https://git.kernel.org/stable/c/4cf2768a0291a0cdd0dae801ea0eafa3878a349d
- https://git.kernel.org/stable/c/d45ff441b416d4aa1af72b1db23d959601c04da2
- https://git.kernel.org/stable/c/76a602fdbb78dd05b2da06f74a988cebc97e82d0
- https://git.kernel.org/stable/c/925bf22c1b823e231b1baea761fe8a1512e442f2
- https://git.kernel.org/stable/c/7de554cabf160e331e4442e2a9ad874ca9875921
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-25490
- GCVE · GCVE-0-2026-31597
CERT-FR advisories
- CERTFR-2026-AVI-1229 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1093 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1066 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0985 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0954 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0926 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0862 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0861 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0831 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0548 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0526 — Multiples vulnérabilités dans les produits Microsoft · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 2.6.39 < 6.6.136cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7 < 6.12.83cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.13 < 6.18.24cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.19 < 6.19.14cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 7.0 < 7.0.1
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 614a9e849ca6ea24843795251cb30af525d5336b < 36539c4d536f851a3b346a6ebb27b51bc3d77a94 ; affected 614a9e849ca6ea24843795251cb30af525d5336b < 35c2c05261d6f6d84aaa1355afa201d507943e76 ; affected 614a9e849ca6ea24843795251cb30af525d5336b < 3f5e74b5db9353b01ed50f4de84e75b755f8fbc2 ; affected 614a9e849ca6ea24843795251cb30af525d5336b < 6f072daefcab1d84ce37c073645615f63be91006 ; affected 614a9e849ca6ea24843795251cb30af525d5336b < 4cf2768a0291a0cdd0dae801ea0eafa3878a349d ; affected 614a9e849ca6ea24843795251cb30af525d5336b < d45ff441b416d4aa1af72b1db23d959601c04da2 |
| Linux · Linux | affected 2.6.39 ; unaffected 0 < 2.6.39 ; unaffected 5.10.258 ≤ 5.10.* ; unaffected 5.15.209 ≤ 5.15.* ; unaffected 6.1.175 ≤ 6.1.* ; unaffected 6.6.136 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |