{"id":"CVE-2025-68771","state":"PUBLISHED","title":"ocfs2: fix kernel BUG in ocfs2_find_victim_chain","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix kernel BUG in ocfs2_find_victim_chain\n\nsyzbot reported a kernel BUG in ocfs2_find_victim_chain() because the\n`cl_next_free_rec` field of the allocation chain list (next free slot in\nthe chain list) is 0, triggring the BUG_ON(!cl->cl_next_free_rec)\ncondition in ocfs2_find_victim_chain() and panicking the kernel.\n\nTo fix this, an if condition is introduced in ocfs2_claim_suballoc_bits(),\njust before calling ocfs2_find_victim_chain(), the code block in it being\nexecuted when either of the following conditions is true:\n\n1. `cl_next_free_rec` is equal to 0, indicating that there are no free\nchains in the allocation chain list\n2. `cl_next_free_rec` is greater than `cl_count` (the total number of\nchains in the allocation chain list)\n\nEither of them being true is indicative of the fact that there are no\nchains left for usage.\n\nThis is addressed using ocfs2_error(), which prints\nthe error log for debugging purposes, rather than panicking the kernel.","publishedAt":"2026-01-13T15:28:49.272Z","updatedAt":"2026-05-11T21:53:02.168Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"1f77e5cd563e6387fdf3bb714fcda36cd88ac5e7","versionType":"git"},{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"d0fd1f732ea8063cecd07a3879b7d815c7ee71ed","versionType":"git"},{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"b08a33d5f80efe6979a6e8f905c1a898910c21dd","versionType":"git"},{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"96f1b074c98c20f55a3b23d2ab44d9fb0f619869","versionType":"git"},{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"e24aedae71652d4119049f1fbef6532ccbe3966d","versionType":"git"},{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"7acc0390e0dd7474c4451d05465a677d55ad4268","versionType":"git"},{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"039bef30e320827bac8990c9f29d2a68cd8adb5f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/suballoc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.16","versionType":"semver"},{"version":"5.10.248","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.198","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.160","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.120","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.64","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.3","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/suballoc.c"]}],"references":["https://git.kernel.org/stable/c/1f77e5cd563e6387fdf3bb714fcda36cd88ac5e7","https://git.kernel.org/stable/c/d0fd1f732ea8063cecd07a3879b7d815c7ee71ed","https://git.kernel.org/stable/c/b08a33d5f80efe6979a6e8f905c1a898910c21dd","https://git.kernel.org/stable/c/96f1b074c98c20f55a3b23d2ab44d9fb0f619869","https://git.kernel.org/stable/c/e24aedae71652d4119049f1fbef6532ccbe3966d","https://git.kernel.org/stable/c/7acc0390e0dd7474c4451d05465a677d55ad4268","https://git.kernel.org/stable/c/039bef30e320827bac8990c9f29d2a68cd8adb5f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:56.034Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/68xxx/CVE-2025-68771.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68771","state":"PUBLISHED","datePublished":"2026-01-13T15:28:49.272Z","dateUpdated":"2026-05-11T21:53:02.168Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-24T10:30:51.035Z"},"containers":{"cna":{"title":"ocfs2: fix kernel BUG in ocfs2_find_victim_chain","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix kernel BUG in ocfs2_find_victim_chain\n\nsyzbot reported a kernel BUG in ocfs2_find_victim_chain() because the\n`cl_next_free_rec` field of the allocation chain list (next free slot in\nthe chain list) is 0, triggring the BUG_ON(!cl->cl_next_free_rec)\ncondition in ocfs2_find_victim_chain() and panicking the kernel.\n\nTo fix this, an if condition is introduced in ocfs2_claim_suballoc_bits(),\njust before calling ocfs2_find_victim_chain(), the code block in it being\nexecuted when either of the following conditions is true:\n\n1. `cl_next_free_rec` is equal to 0, indicating that there are no free\nchains in the allocation chain list\n2. `cl_next_free_rec` is greater than `cl_count` (the total number of\nchains in the allocation chain list)\n\nEither of them being true is indicative of the fact that there are no\nchains left for usage.\n\nThis is addressed using ocfs2_error(), which prints\nthe error log for debugging purposes, rather than panicking the kernel."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"1f77e5cd563e6387fdf3bb714fcda36cd88ac5e7","versionType":"git"},{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"d0fd1f732ea8063cecd07a3879b7d815c7ee71ed","versionType":"git"},{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"b08a33d5f80efe6979a6e8f905c1a898910c21dd","versionType":"git"},{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"96f1b074c98c20f55a3b23d2ab44d9fb0f619869","versionType":"git"},{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"e24aedae71652d4119049f1fbef6532ccbe3966d","versionType":"git"},{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"7acc0390e0dd7474c4451d05465a677d55ad4268","versionType":"git"},{"version":"ccd979bdbce9fba8412beb3f1de68a9d0171b12c","status":"affected","lessThan":"039bef30e320827bac8990c9f29d2a68cd8adb5f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/suballoc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.16","versionType":"semver"},{"version":"5.10.248","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.198","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.160","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.120","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.64","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.3","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/suballoc.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/1f77e5cd563e6387fdf3bb714fcda36cd88ac5e7"},{"url":"https://git.kernel.org/stable/c/d0fd1f732ea8063cecd07a3879b7d815c7ee71ed"},{"url":"https://git.kernel.org/stable/c/b08a33d5f80efe6979a6e8f905c1a898910c21dd"},{"url":"https://git.kernel.org/stable/c/96f1b074c98c20f55a3b23d2ab44d9fb0f619869"},{"url":"https://git.kernel.org/stable/c/e24aedae71652d4119049f1fbef6532ccbe3966d"},{"url":"https://git.kernel.org/stable/c/7acc0390e0dd7474c4451d05465a677d55ad4268"},{"url":"https://git.kernel.org/stable/c/039bef30e320827bac8990c9f29d2a68cd8adb5f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:53:02.168Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"5.10.248"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"5.15.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"6.1.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"6.6.120"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"6.12.64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"6.18.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"6.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}