cbcvebase.
CVE-2025-68771
published 2026-01-13

CVE-2025-68771: 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…

PriorityP420high7.8
EPSS
0.17%
7.0th percentile
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.

Affected

51 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.162-1 (bookworm)linux 6.1.162-1 (bookworm)
debianlinux-6.1< linux 6.1.162-1 (bookworm)linux 6.1.162-1 (bookworm)
linuxlinux
linuxlinux>= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < 1f77e5cd563e6387fdf3bb714fcda36cd88ac5e71f77e5cd563e6387fdf3bb714fcda36cd88ac5e7
linuxlinux>= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < d0fd1f732ea8063cecd07a3879b7d815c7ee71edd0fd1f732ea8063cecd07a3879b7d815c7ee71ed
linuxlinux>= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < b08a33d5f80efe6979a6e8f905c1a898910c21ddb08a33d5f80efe6979a6e8f905c1a898910c21dd
linuxlinux>= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < 96f1b074c98c20f55a3b23d2ab44d9fb0f61986996f1b074c98c20f55a3b23d2ab44d9fb0f619869
linuxlinux>= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < e24aedae71652d4119049f1fbef6532ccbe3966de24aedae71652d4119049f1fbef6532ccbe3966d
linuxlinux>= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < 7acc0390e0dd7474c4451d05465a677d55ad42687acc0390e0dd7474c4451d05465a677d55ad4268
linuxlinux>= ccd979bdbce9fba8412beb3f1de68a9d0171b12c < 039bef30e320827bac8990c9f29d2a68cd8adb5f039bef30e320827bac8990c9f29d2a68cd8adb5f
linuxlinux_kernel>= 0 < 5.10.249-15.10.249-1
linuxlinux_kernel>= 0 < 6.1.162-16.1.162-1
linuxlinux_kernel>= 0 < 6.12.69-16.12.69-1
linuxlinux_kernel>= 0 < 6.18.3-16.18.3-1
linuxlinux_kernel>= 0 < 5.15.0-173.1835.15.0-173.183
linuxlinux_kernel>= 2.6.16 < 5.10.2485.10.248
linuxlinux_kernel>= 5.11.0 < 5.15.1985.15.198
linuxlinux_kernel>= 5.16.0 < 6.1.1606.1.160
linuxlinux_kernel>= 6.13.0 < 6.18.36.18.3
linuxlinux_kernel>= 6.2.0 < 6.6.1206.6.120
linuxlinux_kernel>= 6.7.0 < 6.12.646.12.64
ubuntulinux-aws
ubuntulinux-aws-6.17
ubuntulinux-aws-fips
ubuntulinux-azure

CVSS provenance

osv7.8HIGH
vendor_ubuntu7.8HIGH
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