CVE-2025-22127 (GCVE-0-2025-22127)

Vulnerability from cvelistv5 – Published: 2025-04-16 14:13 – Updated: 2026-05-11 21:13
VLAI
Title
f2fs: fix potential deadloop in prepare_compress_overwrite()
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix potential deadloop in prepare_compress_overwrite() Jan Prusakowski reported a kernel hang issue as below: When running xfstests on linux-next kernel (6.14.0-rc3, 6.12) I encountered a problem in generic/475 test where fsstress process gets blocked in __f2fs_write_data_pages() and the test hangs. The options I used are: MKFS_OPTIONS -- -O compression -O extra_attr -O project_quota -O quota /dev/vdc MOUNT_OPTIONS -- -o acl,user_xattr -o discard,compress_extension=* /dev/vdc /vdc INFO: task kworker/u8:0:11 blocked for more than 122 seconds. Not tainted 6.14.0-rc3-xfstests-lockdep #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:0 state:D stack:0 pid:11 tgid:11 ppid:2 task_flags:0x4208160 flags:0x00004000 Workqueue: writeback wb_workfn (flush-253:0) Call Trace: <TASK> __schedule+0x309/0x8e0 schedule+0x3a/0x100 schedule_preempt_disabled+0x15/0x30 __mutex_lock+0x59a/0xdb0 __f2fs_write_data_pages+0x3ac/0x400 do_writepages+0xe8/0x290 __writeback_single_inode+0x5c/0x360 writeback_sb_inodes+0x22f/0x570 wb_writeback+0xb0/0x410 wb_do_writeback+0x47/0x2f0 wb_workfn+0x5a/0x1c0 process_one_work+0x223/0x5b0 worker_thread+0x1d5/0x3c0 kthread+0xfd/0x230 ret_from_fork+0x31/0x50 ret_from_fork_asm+0x1a/0x30 </TASK> The root cause is: once generic/475 starts toload error table to dm device, f2fs_prepare_compress_overwrite() will loop reading compressed cluster pages due to IO error, meanwhile it has held .writepages lock, it can block all other writeback tasks. Let's fix this issue w/ below changes: - add f2fs_handle_page_eio() in prepare_compress_overwrite() to detect IO error. - detect cp_error earler in f2fs_read_multi_pages().
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4c8ff7095bef64fc47e996a938f7d57f9e077da3 , < 7215cf8ef54bdc9082dffac4662416d54961e258 (git)
Affected: 4c8ff7095bef64fc47e996a938f7d57f9e077da3 , < 3147ee567dd9004a49826ddeaf0a4b12865d4409 (git)
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Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 6.14.2 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/compress.c",
            "fs/f2fs/data.c"
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          "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 \u003e /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 \u003cTASK\u003e\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 \u003c/TASK\u003e\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\u0027s 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()."
        }
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          "url": "https://git.kernel.org/stable/c/3147ee567dd9004a49826ddeaf0a4b12865d4409"
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    "cveId": "CVE-2025-22127",
    "datePublished": "2025-04-16T14:13:10.015Z",
    "dateReserved": "2024-12-29T08:45:45.824Z",
    "dateUpdated": "2026-05-11T21:13:29.464Z",
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    "epss": {
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      "date": "2026-07-23",
      "epss": "0.00116",
      "percentile": "0.01922"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-22127\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-16T15:16:06.813\",\"lastModified\":\"2026-06-17T08:45:12.317\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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 \u003e /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 \u003cTASK\u003e\\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 \u003c/TASK\u003e\\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\u0027s 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().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: f2fs: corrige un posible bucle muerto en prepare_compress_overwrite() Jan Prusakowski inform\u00f3 un problema de bloqueo del kernel como se muestra a continuaci\u00f3n: Al ejecutar xfstests en el kernel linux-next (6.14.0-rc3, 6.12), encontr\u00e9 un problema en la prueba generic/475 donde el proceso fsstress se bloquea en __f2fs_write_data_pages() y la prueba se bloquea. Las opciones que utilic\u00e9 son: MKFS_OPTIONS -- -O compression -O extra_attr -O project_quota -O quota /dev/vdc MOUNT_OPTIONS -- -o acl,user_xattr -o discard,compress_extension=* /dev/vdc /vdc INFO: la tarea kworker/u8:0:11 se bloque\u00f3 durante m\u00e1s de 122 segundos. No contaminado 6.14.0-rc3-xfstests-lockdep #1 \\\"echo 0 \u0026gt; /proc/sys/kernel/hung_task_timeout_secs\\\" deshabilita este mensaje. tarea:kworker/u8:0 estado:D pila:0 pid:11 tgid:11 ppid:2 indicadores_de_tarea:0x4208160 indicadores:0x00004000 Cola de trabajo: reescritura wb_workfn (flush-253:0) Rastreo de llamadas:  __schedule+0x309/0x8e0 schedule+0x3a/0x100 schedule_preempt_disabled+0x15/0x30 __mutex_lock+0x59a/0xdb0 __f2fs_write_data_pages+0x3ac/0x400 do_writepages+0xe8/0x290 __writeback_single_inode+0x5c/0x360 writeback_sb_inodes+0x22f/0x570 La causa ra\u00edz es: una vez que generic/475 comienza a cargar la tabla de errores en el dispositivo dm, f2fs_prepare_compress_overwrite() leer\u00e1 en bucle las p\u00e1ginas comprimidas del cl\u00faster debido a un error de E/S, mientras mantiene el bloqueo .writepages, puede bloquear todas las dem\u00e1s tareas de escritura diferida. Solucionemos este problema con los siguientes cambios: - agregue f2fs_handle_page_eio() en prepare_compress_overwrite() para detectar errores de E/S. - detecte cp_error antes en f2fs_read_multi_pages().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/f2fs/compress.c\",\"fs/f2fs/data.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4c8ff7095bef64fc47e996a938f7d57f9e077da3\",\"lessThan\":\"7215cf8ef54bdc9082dffac4662416d54961e258\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4c8ff7095bef64fc47e996a938f7d57f9e077da3\",\"lessThan\":\"3147ee567dd9004a49826ddeaf0a4b12865d4409\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/f2fs/compress.c\",\"fs/f2fs/data.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14.2\",\"lessThanOrEqual\":\"6.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-667\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.6\",\"versionEndExcluding\":\"6.14.2\",\"matchCriteriaId\":\"D5E066C2-5A3F-4110-9102-BD6F43146E21\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3147ee567dd9004a49826ddeaf0a4b12865d4409\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7215cf8ef54bdc9082dffac4662416d54961e258\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:19:01+00:00",
      "cve": "CVE-2025-22127",
      "id": "CVE-2025-22127",
      "initial_release_date": "2025-04-16T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: f2fs: fix potential deadloop in prepare_compress_overwrite()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-22127.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-05-12T03:52:53Z",
      "cve": "CVE-2025-22127",
      "id": "CVE-2025-22127",
      "initial_release_date": "2025-04-23T02:38:24Z",
      "product_status:known_affected": "6",
      "product_status:known_not_affected": "267",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-22127",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-22127.json",
      "version": "7"
    }
  }
}



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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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