f2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode (Linux Linux)

CVE-2025-38626
MEDIUM 5.5

En bref

Source
NVD
EPSS
EPSS 0.17 % · centile 6 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode w/ "mode=lfs" mount option, generic/299 will cause system panic as below: ------------[ cut here ]------------ kernel BUG at fs/f2fs/segment.c:2835! Call Trace: <TASK> f2fs_allocate_data_block+0x6f4/0xc50 f2fs_map_blocks+0x970/0x1550 f2fs_iomap_begin+0xb2/0x1e0 iomap_iter+0x1d6/0x430 __iomap_dio_rw+0x208/0x9a0 f2fs_file_write_iter+0x6b3/0xfa0 aio_write+0x15d/0x2e0 io_submit_one+0x55e/0xab0 __x64_sys_io_submit+0xa5/0x230 do_syscall_64+0x84/0x2f0 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0010:new_curseg+0x70f/0x720 The root cause of we run out-of-space is: in f2fs_map_blocks(), f2fs may trigger foreground gc only if it allocates any physical block, it will be a little bit later when there is multiple threads writing data w/ aio/dio/bufio method in parallel, since we always use OPU in lfs mode, so f2fs_map_blocks() does block allocations aggressively. In order to fix this issue, let's give a chance to trigger foreground gc in prior to block allocation in f2fs_map_blocks().

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 36abef4e796d382e81a0c2d21ea5327481dd7154 < c737047f4665232d1e26b3620bc62df334545451 ; affected 36abef4e796d382e81a0c2d21ea5327481dd7154 < d2f280f43a2a9d918fd23169ff3a6f3b65c7cec5 ; affected 36abef4e796d382e81a0c2d21ea5327481dd7154 < f289690f50a01c3e085d87853392d5b7436a4cee ; affected 36abef4e796d382e81a0c2d21ea5327481dd7154 < 82765ce5c7a56f9309ee45328e763610eaf11253 ; affected 36abef4e796d382e81a0c2d21ea5327481dd7154 < 264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5 ; affected 36abef4e796d382e81a0c2d21ea5327481dd7154 < 385e64a0744584397b4b52b27c96703516f39968
Linux · Linuxaffected 4.8 ; unaffected 0 < 4.8 ; unaffected 5.15.209 ≤ 5.15.* ; unaffected 6.1.167 ≤ 6.1.* ; unaffected 6.6.102 ≤ 6.6.* ; unaffected 6.12.42 ≤ 6.12.*

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