{"id":"CVE-2025-22127","state":"PUBLISHED","title":"f2fs: fix potential deadloop in prepare_compress_overwrite()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix potential deadloop in prepare_compress_overwrite()\n\nJan Prusakowski reported a kernel hang issue as below:\n\nWhen running xfstests on linux-next kernel (6.14.0-rc3, 6.12) I\nencountered a problem in generic/475 test where fsstress process\ngets blocked in __f2fs_write_data_pages() and the test hangs.\nThe options I used are:\n\nMKFS_OPTIONS  -- -O compression -O extra_attr -O project_quota -O quota /dev/vdc\nMOUNT_OPTIONS -- -o acl,user_xattr -o discard,compress_extension=* /dev/vdc /vdc\n\nINFO: task kworker/u8:0:11 blocked for more than 122 seconds.\n      Not tainted 6.14.0-rc3-xfstests-lockdep #1\n\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\ntask:kworker/u8:0    state:D stack:0     pid:11    tgid:11    ppid:2      task_flags:0x4208160 flags:0x00004000\nWorkqueue: writeback wb_workfn (flush-253:0)\nCall Trace:\n <TASK>\n __schedule+0x309/0x8e0\n schedule+0x3a/0x100\n schedule_preempt_disabled+0x15/0x30\n __mutex_lock+0x59a/0xdb0\n __f2fs_write_data_pages+0x3ac/0x400\n do_writepages+0xe8/0x290\n __writeback_single_inode+0x5c/0x360\n writeback_sb_inodes+0x22f/0x570\n wb_writeback+0xb0/0x410\n wb_do_writeback+0x47/0x2f0\n wb_workfn+0x5a/0x1c0\n process_one_work+0x223/0x5b0\n worker_thread+0x1d5/0x3c0\n kthread+0xfd/0x230\n ret_from_fork+0x31/0x50\n ret_from_fork_asm+0x1a/0x30\n </TASK>\n\nThe root cause is: once generic/475 starts toload error table to dm\ndevice, f2fs_prepare_compress_overwrite() will loop reading compressed\ncluster pages due to IO error, meanwhile it has held .writepages lock,\nit can block all other writeback tasks.\n\nLet's fix this issue w/ below changes:\n- add f2fs_handle_page_eio() in prepare_compress_overwrite() to\ndetect IO error.\n- detect cp_error earler in f2fs_read_multi_pages().","publishedAt":"2025-04-16T14:13:10.015Z","updatedAt":"2026-10-30T12:21:16.804Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4c8ff7095bef64fc47e996a938f7d57f9e077da3","status":"affected","lessThan":"353b262268c1646a0e7c96d4ed14c5d72a30ccb4","versionType":"git"},{"version":"4c8ff7095bef64fc47e996a938f7d57f9e077da3","status":"affected","lessThan":"4513843d58d8fa1daebd3817205a15309b146342","versionType":"git"},{"version":"4c8ff7095bef64fc47e996a938f7d57f9e077da3","status":"affected","lessThan":"7cd460bd9e7c6e6c30a33982603f65fb5deab1e4","versionType":"git"},{"version":"4c8ff7095bef64fc47e996a938f7d57f9e077da3","status":"affected","lessThan":"7215cf8ef54bdc9082dffac4662416d54961e258","versionType":"git"},{"version":"4c8ff7095bef64fc47e996a938f7d57f9e077da3","status":"affected","lessThan":"3147ee567dd9004a49826ddeaf0a4b12865d4409","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/compress.c","fs/f2fs/data.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.6","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.14.2","status":"unaffected","lessThanOrEqual":"6.14.*","versionType":"semver"},{"version":"6.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/compress.c","fs/f2fs/data.c"]}],"references":["https://git.kernel.org/stable/c/353b262268c1646a0e7c96d4ed14c5d72a30ccb4","https://git.kernel.org/stable/c/4513843d58d8fa1daebd3817205a15309b146342","https://git.kernel.org/stable/c/7cd460bd9e7c6e6c30a33982603f65fb5deab1e4","https://git.kernel.org/stable/c/7215cf8ef54bdc9082dffac4662416d54961e258","https://git.kernel.org/stable/c/3147ee567dd9004a49826ddeaf0a4b12865d4409"],"weaknesses":[],"ingestedAt":"2026-10-30T12:38:04.623Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/22xxx/CVE-2025-22127.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-22127","state":"PUBLISHED","datePublished":"2025-04-16T14:13:10.015Z","dateUpdated":"2026-10-30T12:21:16.804Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-12-29T08:45:45.824Z"},"containers":{"cna":{"title":"f2fs: fix potential deadloop in prepare_compress_overwrite()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix potential deadloop in prepare_compress_overwrite()\n\nJan Prusakowski reported a kernel hang issue as below:\n\nWhen running xfstests on linux-next kernel (6.14.0-rc3, 6.12) I\nencountered a problem in generic/475 test where fsstress process\ngets blocked in __f2fs_write_data_pages() and the test hangs.\nThe options I used are:\n\nMKFS_OPTIONS  -- -O compression -O extra_attr -O project_quota -O quota /dev/vdc\nMOUNT_OPTIONS -- -o acl,user_xattr -o discard,compress_extension=* /dev/vdc /vdc\n\nINFO: task kworker/u8:0:11 blocked for more than 122 seconds.\n      Not tainted 6.14.0-rc3-xfstests-lockdep #1\n\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\ntask:kworker/u8:0    state:D stack:0     pid:11    tgid:11    ppid:2      task_flags:0x4208160 flags:0x00004000\nWorkqueue: writeback wb_workfn (flush-253:0)\nCall Trace:\n <TASK>\n __schedule+0x309/0x8e0\n schedule+0x3a/0x100\n schedule_preempt_disabled+0x15/0x30\n __mutex_lock+0x59a/0xdb0\n __f2fs_write_data_pages+0x3ac/0x400\n do_writepages+0xe8/0x290\n __writeback_single_inode+0x5c/0x360\n writeback_sb_inodes+0x22f/0x570\n wb_writeback+0xb0/0x410\n wb_do_writeback+0x47/0x2f0\n wb_workfn+0x5a/0x1c0\n process_one_work+0x223/0x5b0\n worker_thread+0x1d5/0x3c0\n kthread+0xfd/0x230\n ret_from_fork+0x31/0x50\n ret_from_fork_asm+0x1a/0x30\n </TASK>\n\nThe root cause is: once generic/475 starts toload error table to dm\ndevice, f2fs_prepare_compress_overwrite() will loop reading compressed\ncluster pages due to IO error, meanwhile it has held .writepages lock,\nit can block all other writeback tasks.\n\nLet's fix this issue w/ below changes:\n- add f2fs_handle_page_eio() in prepare_compress_overwrite() to\ndetect IO error.\n- detect cp_error earler in f2fs_read_multi_pages()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4c8ff7095bef64fc47e996a938f7d57f9e077da3","status":"affected","lessThan":"353b262268c1646a0e7c96d4ed14c5d72a30ccb4","versionType":"git"},{"version":"4c8ff7095bef64fc47e996a938f7d57f9e077da3","status":"affected","lessThan":"4513843d58d8fa1daebd3817205a15309b146342","versionType":"git"},{"version":"4c8ff7095bef64fc47e996a938f7d57f9e077da3","status":"affected","lessThan":"7cd460bd9e7c6e6c30a33982603f65fb5deab1e4","versionType":"git"},{"version":"4c8ff7095bef64fc47e996a938f7d57f9e077da3","status":"affected","lessThan":"7215cf8ef54bdc9082dffac4662416d54961e258","versionType":"git"},{"version":"4c8ff7095bef64fc47e996a938f7d57f9e077da3","status":"affected","lessThan":"3147ee567dd9004a49826ddeaf0a4b12865d4409","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/compress.c","fs/f2fs/data.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.6","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.14.2","status":"unaffected","lessThanOrEqual":"6.14.*","versionType":"semver"},{"version":"6.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/compress.c","fs/f2fs/data.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/353b262268c1646a0e7c96d4ed14c5d72a30ccb4"},{"url":"https://git.kernel.org/stable/c/4513843d58d8fa1daebd3817205a15309b146342"},{"url":"https://git.kernel.org/stable/c/7cd460bd9e7c6e6c30a33982603f65fb5deab1e4"},{"url":"https://git.kernel.org/stable/c/7215cf8ef54bdc9082dffac4662416d54961e258"},{"url":"https://git.kernel.org/stable/c/3147ee567dd9004a49826ddeaf0a4b12865d4409"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:21:16.804Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.14.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.15"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}