CVE-2025-68771
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.
How to fix
- Linux Linux1f77e5cd563e6387fdf3bb714fcda36cd88ac5e7, d0fd1f732ea8063cecd07a3879b7d815c7ee71ed, b08a33d5f80efe6979a6e8f905c1a898910c21dd, 96f1b074c98c20f55a3b23d2ab44d9fb0f619869, e24aedae71652d4119049f1fbef6532ccbe3966d, 7acc0390e0dd7474c4451d05465a677d55ad4268, 039bef30e320827bac8990c9f29d2a68cd8adb5f or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | ccd979bdbce9fba8412beb3f1de68a9d0171b12c ≤ v < 1f77e5cd563e6387fdf3bb714fcda36cd88ac5e7, ccd979bdbce9fba8412beb3f1de68a9d0171b12c ≤ v < d0fd1f732ea8063cecd07a3879b7d815c7ee71ed, ccd979bdbce9fba8412beb3f1de68a9d0171b12c ≤ v < b08a33d5f80efe6979a6e8f905c1a898910c21dd, ccd979bdbce9fba8412beb3f1de68a9d0171b12c ≤ v < 96f1b074c98c20f55a3b23d2ab44d9fb0f619869, ccd979bdbce9fba8412beb3f1de68a9d0171b12c ≤ v < e24aedae71652d4119049f1fbef6532ccbe3966d, ccd979bdbce9fba8412beb3f1de68a9d0171b12c ≤ v < 7acc0390e0dd7474c4451d05465a677d55ad4268, ccd979bdbce9fba8412beb3f1de68a9d0171b12c ≤ v < 039bef30e320827bac8990c9f29d2a68cd8adb5f, 2.6.16 | 1f77e5cd563e6387fdf3bb714fcda36cd88ac5e7, d0fd1f732ea8063cecd07a3879b7d815c7ee71ed, b08a33d5f80efe6979a6e8f905c1a898910c21dd, 96f1b074c98c20f55a3b23d2ab44d9fb0f619869, e24aedae71652d4119049f1fbef6532ccbe3966d, 7acc0390e0dd7474c4451d05465a677d55ad4268, 039bef30e320827bac8990c9f29d2a68cd8adb5f |
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