f2fs: fix to avoid UAF in f2fs_write_end_io() (Linux Linux)

CVE-2026-23234
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.14 % · centile 3 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Analyzed

Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid UAF in f2fs_write_end_io() As syzbot reported an use-after-free issue in f2fs_write_end_io(). It is caused by below race condition: loop device umount - worker_thread - loop_process_work - do_req_filebacked - lo_rw_aio - lo_rw_aio_complete - blk_mq_end_request - blk_update_request - f2fs_write_end_io - dec_page_count - folio_end_writeback - kill_f2fs_super - kill_block_super - f2fs_put_super : free(sbi) : get_pages(, F2FS_WB_CP_DATA) accessed sbi which is freed In kill_f2fs_super(), we will drop all page caches of f2fs inodes before call free(sbi), it guarantee that all folios should end its writeback, so it should be safe to access sbi before last folio_end_writeback(). Let's relocate ckpt thread wakeup flow before folio_end_writeback() to resolve this issue.

Faiblesses (CWE)

  • CWE-416 — Utilisation après libération

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected e234088758fca3a669ebb1a02d8bf7bf60f0e4ff < 0fb58aff0dafd6837cc91f4154f3ed6e020358fa ; affected e234088758fca3a669ebb1a02d8bf7bf60f0e4ff < 2f67ff1e15a8a4d0e4ffc6564ab20d03d7398fe9 ; affected e234088758fca3a669ebb1a02d8bf7bf60f0e4ff < 505e1c0530db6152cab3feef8e3e4da3d3e358c9 ; affected e234088758fca3a669ebb1a02d8bf7bf60f0e4ff < acc2c97fc0005846e5cf11b5ba3189fef130c9b3 ; affected e234088758fca3a669ebb1a02d8bf7bf60f0e4ff < cf4a9e1bc8129eb63fda5f8bdcd8d87f0bd76f42 ; affected e234088758fca3a669ebb1a02d8bf7bf60f0e4ff < 995030be4ce6338c6ff814583c14166446a64008
Linux · Linuxaffected 3.13 ; unaffected 0 < 3.13 ; unaffected 5.10.251 ≤ 5.10.* ; unaffected 5.15.201 ≤ 5.15.* ; unaffected 6.1.164 ≤ 6.1.* ; unaffected 6.6.127 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD