ocfs2: fix kernel BUG in ocfs2_find_victim_chain (Linux Linux)

CVE-2025-68771
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Source
NVD
EPSS
EPSS 0.21 % · centile 11 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Deferred

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix kernel BUG in ocfs2_find_victim_chain syzbot reported a kernel BUG in ocfs2_find_victim_chain() because the `cl_next_free_rec` field of the allocation chain list (next free slot in the chain list) is 0, triggring the BUG_ON(!cl->cl_next_free_rec) condition in ocfs2_find_victim_chain() and panicking the kernel. To fix this, an if condition is introduced in ocfs2_claim_suballoc_bits(), just before calling ocfs2_find_victim_chain(), the code block in it being executed when either of the following conditions is true: 1. `cl_next_free_rec` is equal to 0, indicating that there are no free chains in the allocation chain list 2. `cl_next_free_rec` is greater than `cl_count` (the total number of chains in the allocation chain list) Either of them being true is indicative of the fact that there are no chains left for usage. This is addressed using ocfs2_error(), which prints the error log for debugging purposes, rather than panicking the kernel.

Références

Références européennes

Avis du CERT-FR

Produits affectés

ProduitVersions
Linux · Linuxaffected ccd979bdbce9fba8412beb3f1de68a9d0171b12c < 1f77e5cd563e6387fdf3bb714fcda36cd88ac5e7 ; affected ccd979bdbce9fba8412beb3f1de68a9d0171b12c < d0fd1f732ea8063cecd07a3879b7d815c7ee71ed ; affected ccd979bdbce9fba8412beb3f1de68a9d0171b12c < b08a33d5f80efe6979a6e8f905c1a898910c21dd ; affected ccd979bdbce9fba8412beb3f1de68a9d0171b12c < 96f1b074c98c20f55a3b23d2ab44d9fb0f619869 ; affected ccd979bdbce9fba8412beb3f1de68a9d0171b12c < e24aedae71652d4119049f1fbef6532ccbe3966d ; affected ccd979bdbce9fba8412beb3f1de68a9d0171b12c < 7acc0390e0dd7474c4451d05465a677d55ad4268
Linux · Linuxaffected 2.6.16 ; unaffected 0 < 2.6.16 ; unaffected 5.10.248 ≤ 5.10.* ; unaffected 5.15.198 ≤ 5.15.* ; unaffected 6.1.160 ≤ 6.1.* ; unaffected 6.6.120 ≤ 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