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CVE-2025-68796 (GCVE-0-2025-68796)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-05-11 21:53
VLAI
Title
f2fs: fix to avoid updating zero-sized extent in extent cache
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid updating zero-sized extent in extent cache As syzbot reported: F2FS-fs (loop0): __update_extent_tree_range: extent len is zero, type: 0, extent [0, 0, 0], age [0, 0] ------------[ cut here ]------------ kernel BUG at fs/f2fs/extent_cache.c:678! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:__update_extent_tree_range+0x13bc/0x1500 fs/f2fs/extent_cache.c:678 Call Trace: <TASK> f2fs_update_read_extent_cache_range+0x192/0x3e0 fs/f2fs/extent_cache.c:1085 f2fs_do_zero_range fs/f2fs/file.c:1657 [inline] f2fs_zero_range+0x10c1/0x1580 fs/f2fs/file.c:1737 f2fs_fallocate+0x583/0x990 fs/f2fs/file.c:2030 vfs_fallocate+0x669/0x7e0 fs/open.c:342 ioctl_preallocate fs/ioctl.c:289 [inline] file_ioctl+0x611/0x780 fs/ioctl.c:-1 do_vfs_ioctl+0xb33/0x1430 fs/ioctl.c:576 __do_sys_ioctl fs/ioctl.c:595 [inline] __se_sys_ioctl+0x82/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f07bc58eec9 In error path of f2fs_zero_range(), it may add a zero-sized extent into extent cache, it should be avoided.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6e9619499f53b22ead972e476c0e8341c997d929 , < 9c07bd262c13ca922adad6e7613d48505f97f548 (git)
Affected: 6e9619499f53b22ead972e476c0e8341c997d929 , < 72c58a82e6fb7b327e8701f5786c70c3edc56188 (git)
Affected: 6e9619499f53b22ead972e476c0e8341c997d929 , < e50b81c50fcbe63f50405bb40f262162ff32af88 (git)
Affected: 6e9619499f53b22ead972e476c0e8341c997d929 , < efe3371001f50a2d6f746b50bdc6f9f26b2089ec (git)
Affected: 6e9619499f53b22ead972e476c0e8341c997d929 , < 4f244c64efe628d277b916f47071adf480eb8646 (git)
Affected: 6e9619499f53b22ead972e476c0e8341c997d929 , < bac23833220a1f8fe8dfab7e16efa20ff64d7589 (git)
Affected: 6e9619499f53b22ead972e476c0e8341c997d929 , < 7c37c79510329cd951a4dedf3f7bf7e2b18dccec (git)
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Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid updating zero-sized extent in extent cache\n\nAs syzbot reported:\n\nF2FS-fs (loop0): __update_extent_tree_range: extent len is zero, type: 0, extent [0, 0, 0], age [0, 0]\n------------[ cut here ]------------\nkernel BUG at fs/f2fs/extent_cache.c:678!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nCPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nRIP: 0010:__update_extent_tree_range+0x13bc/0x1500 fs/f2fs/extent_cache.c:678\nCall Trace:\n \u003cTASK\u003e\n f2fs_update_read_extent_cache_range+0x192/0x3e0 fs/f2fs/extent_cache.c:1085\n f2fs_do_zero_range fs/f2fs/file.c:1657 [inline]\n f2fs_zero_range+0x10c1/0x1580 fs/f2fs/file.c:1737\n f2fs_fallocate+0x583/0x990 fs/f2fs/file.c:2030\n vfs_fallocate+0x669/0x7e0 fs/open.c:342\n ioctl_preallocate fs/ioctl.c:289 [inline]\n file_ioctl+0x611/0x780 fs/ioctl.c:-1\n do_vfs_ioctl+0xb33/0x1430 fs/ioctl.c:576\n __do_sys_ioctl fs/ioctl.c:595 [inline]\n __se_sys_ioctl+0x82/0x170 fs/ioctl.c:583\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f07bc58eec9\n\nIn error path of f2fs_zero_range(), it may add a zero-sized extent\ninto extent cache, it should be avoided."
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    "datePublished": "2026-01-13T15:29:06.892Z",
    "dateReserved": "2025-12-24T10:30:51.042Z",
    "dateUpdated": "2026-05-11T21:53:30.248Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2025-68796",
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      "cve": "CVE-2025-68796",
      "id": "msrc_CVE-2025-68796",
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      "source": "Microsoft CSAF VEX",
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      "title": "f2fs: fix to avoid updating zero-sized extent in extent cache",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2025-68796.json",
      "version": "3"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68796\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-13T16:16:01.540\",\"lastModified\":\"2026-06-17T09:59:36.160\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nf2fs: fix to avoid updating zero-sized extent in extent cache\\n\\nAs syzbot reported:\\n\\nF2FS-fs (loop0): __update_extent_tree_range: extent len is zero, type: 0, extent [0, 0, 0], age [0, 0]\\n------------[ cut here ]------------\\nkernel BUG at fs/f2fs/extent_cache.c:678!\\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\\nCPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\\nRIP: 0010:__update_extent_tree_range+0x13bc/0x1500 fs/f2fs/extent_cache.c:678\\nCall Trace:\\n \u003cTASK\u003e\\n f2fs_update_read_extent_cache_range+0x192/0x3e0 fs/f2fs/extent_cache.c:1085\\n f2fs_do_zero_range fs/f2fs/file.c:1657 [inline]\\n f2fs_zero_range+0x10c1/0x1580 fs/f2fs/file.c:1737\\n f2fs_fallocate+0x583/0x990 fs/f2fs/file.c:2030\\n vfs_fallocate+0x669/0x7e0 fs/open.c:342\\n ioctl_preallocate fs/ioctl.c:289 [inline]\\n file_ioctl+0x611/0x780 fs/ioctl.c:-1\\n do_vfs_ioctl+0xb33/0x1430 fs/ioctl.c:576\\n __do_sys_ioctl fs/ioctl.c:595 [inline]\\n __se_sys_ioctl+0x82/0x170 fs/ioctl.c:583\\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\nRIP: 0033:0x7f07bc58eec9\\n\\nIn error path of f2fs_zero_range(), it may add a zero-sized extent\\ninto extent cache, it should be avoided.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nf2fs: correcci\u00f3n para evitar actualizar una extensi\u00f3n de tama\u00f1o cero en la cach\u00e9 de extensiones\\n\\nComo inform\u00f3 syzbot:\\n\\nF2FS-fs (loop0): __update_extent_tree_range: la longitud de la extensi\u00f3n es cero, tipo: 0, extensi\u00f3n [0, 0, 0], antig\u00fcedad [0, 0]\\n------------[ cut here ]------------\\nBUG del kernel en fs/f2fs/extent_cache.c:678!\\nOops: c\u00f3digo de operaci\u00f3n inv\u00e1lido: 0000 [#1] SMP KASAN NOPTI\\nCPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 No contaminado syzkaller #0 PREEMPT(full)\\nNombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\\nRIP: 0010:__update_extent_tree_range+0x13bc/0x1500 fs/f2fs/extent_cache.c:678\\nTraza de la llamada:\\n \\n f2fs_update_read_extent_cache_range+0x192/0x3e0 fs/f2fs/extent_cache.c:1085\\n f2fs_do_zero_range fs/f2fs/file.c:1657 [inline]\\n f2fs_zero_range+0x10c1/0x1580 fs/f2fs/file.c:1737\\n f2fs_fallocate+0x583/0x990 fs/f2fs/file.c:2030\\n vfs_fallocate+0x669/0x7e0 fs/open.c:342\\n ioctl_preallocate fs/ioctl.c:289 [inline]\\n file_ioctl+0x611/0x780 fs/ioctl.c:-1\\n do_vfs_ioctl+0xb33/0x1430 fs/ioctl.c:576\\n __do_sys_ioctl fs/ioctl.c:595 [inline]\\n __se_sys_ioctl+0x82/0x170 fs/ioctl.c:583\\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\nRIP: 0033:0x7f07bc58eec9\\n\\nEn la ruta de error de f2fs_zero_range(), puede a\u00f1adir una extensi\u00f3n de tama\u00f1o cero en la cach\u00e9 de extensiones, lo cual debe evitarse.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/f2fs/file.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6e9619499f53b22ead972e476c0e8341c997d929\",\"lessThan\":\"9c07bd262c13ca922adad6e7613d48505f97f548\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6e9619499f53b22ead972e476c0e8341c997d929\",\"lessThan\":\"72c58a82e6fb7b327e8701f5786c70c3edc56188\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6e9619499f53b22ead972e476c0e8341c997d929\",\"lessThan\":\"e50b81c50fcbe63f50405bb40f262162ff32af88\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6e9619499f53b22ead972e476c0e8341c997d929\",\"lessThan\":\"efe3371001f50a2d6f746b50bdc6f9f26b2089ec\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6e9619499f53b22ead972e476c0e8341c997d929\",\"lessThan\":\"4f244c64efe628d277b916f47071adf480eb8646\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6e9619499f53b22ead972e476c0e8341c997d929\",\"lessThan\":\"bac23833220a1f8fe8dfab7e16efa20ff64d7589\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6e9619499f53b22ead972e476c0e8341c997d929\",\"lessThan\":\"7c37c79510329cd951a4dedf3f7bf7e2b18dccec\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/f2fs/file.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.248\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.198\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.160\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.120\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.64\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.3\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4f244c64efe628d277b916f47071adf480eb8646\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/72c58a82e6fb7b327e8701f5786c70c3edc56188\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7c37c79510329cd951a4dedf3f7bf7e2b18dccec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9c07bd262c13ca922adad6e7613d48505f97f548\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bac23833220a1f8fe8dfab7e16efa20ff64d7589\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e50b81c50fcbe63f50405bb40f262162ff32af88\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/efe3371001f50a2d6f746b50bdc6f9f26b2089ec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:11:19+00:00",
      "cve": "CVE-2025-68796",
      "id": "CVE-2025-68796",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: f2fs: fix to avoid updating zero-sized extent in extent cache",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68796.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T16:48:59Z",
      "cve": "CVE-2025-68796",
      "id": "CVE-2025-68796",
      "initial_release_date": "2026-01-15T00:26:09Z",
      "product_status:known_not_affected": "457",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-68796",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-68796.json",
      "version": "11"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.