ext4: fix double-free of blocks due to wrong extents moved_len (Linux Linux)

CVE-2024-26704
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.27 % · centile 19 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix double-free of blocks due to wrong extents moved_len In ext4_move_extents(), moved_len is only updated when all moves are successfully executed, and only discards orig_inode and donor_inode preallocations when moved_len is not zero. When the loop fails to exit after successfully moving some extents, moved_len is not updated and remains at 0, so it does not discard the preallocations. If the moved extents overlap with the preallocated extents, the overlapped extents are freed twice in ext4_mb_release_inode_pa() and ext4_process_freed_data() (as described in commit 94d7c16cbbbd ("ext4: Fix double-free of blocks with EXT4_IOC_MOVE_EXT")), and bb_free is incremented twice. Hence when trim is executed, a zero-division bug is triggered in mb_update_avg_fragment_size() because bb_free is not zero and bb_fragments is zero. Therefore, update move_len after each extent move to avoid the issue.

Faiblesses (CWE)

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:HLinux
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
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 fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a < b4fbb89d722cbb16beaaea234b7230faaaf68c71 ; affected fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a < afbcad9ae7d6d11608399188f03a837451b6b3a1 ; affected fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a < d033a555d9a1cf53dbf3301af7199cc4a4c8f537 ; affected fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a < afba9d11320dad5ce222ac8964caf64b7b4bedb1 ; affected fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a < 185eab30486ba3e7bf8b9c2e049c79a06ffd2bc1 ; affected fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a < 2883940b19c38d5884c8626483811acf4d7e148f
Linux · Linuxaffected 3.18 ; unaffected 0 < 3.18 ; unaffected 4.19.307 ≤ 4.19.* ; unaffected 5.4.269 ≤ 5.4.* ; unaffected 5.10.210 ≤ 5.10.* ; unaffected 5.15.149 ≤ 5.15.*

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