CVE-2025-37739 (GCVE-0-2025-37739)

Vulnerability from cvelistv5 – Published: 2025-05-01 12:55 – Updated: 2026-05-11 21:14
VLAI
Title
f2fs: fix to avoid out-of-bounds access in f2fs_truncate_inode_blocks()
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid out-of-bounds access in f2fs_truncate_inode_blocks() syzbot reports an UBSAN issue as below: ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in fs/f2fs/node.h:381:10 index 18446744073709550692 is out of range for type '__le32[5]' (aka 'unsigned int[5]') CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted 6.14.0-rc3-syzkaller-00060-g6537cfb395f3 #0 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:429 get_nid fs/f2fs/node.h:381 [inline] f2fs_truncate_inode_blocks+0xa5e/0xf60 fs/f2fs/node.c:1181 f2fs_do_truncate_blocks+0x782/0x1030 fs/f2fs/file.c:808 f2fs_truncate_blocks+0x10d/0x300 fs/f2fs/file.c:836 f2fs_truncate+0x417/0x720 fs/f2fs/file.c:886 f2fs_file_write_iter+0x1bdb/0x2550 fs/f2fs/file.c:5093 aio_write+0x56b/0x7c0 fs/aio.c:1633 io_submit_one+0x8a7/0x18a0 fs/aio.c:2052 __do_sys_io_submit fs/aio.c:2111 [inline] __se_sys_io_submit+0x171/0x2e0 fs/aio.c:2081 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f238798cde9 index 18446744073709550692 (decimal, unsigned long long) = 0xfffffffffffffc64 (hexadecimal, unsigned long long) = -924 (decimal, long long) In f2fs_truncate_inode_blocks(), UBSAN detects that get_nid() tries to access .i_nid[-924], it means both offset[0] and level should zero. The possible case should be in f2fs_do_truncate_blocks(), we try to truncate inode size to zero, however, dn.ofs_in_node is zero and dn.node_page is not an inode page, so it fails to truncate inode page, and then pass zeroed free_from to f2fs_truncate_inode_blocks(), result in this issue. if (dn.ofs_in_node || IS_INODE(dn.node_page)) { f2fs_truncate_data_blocks_range(&dn, count); free_from += count; } I guess the reason why dn.node_page is not an inode page could be: there are multiple nat entries share the same node block address, once the node block address was reused, f2fs_get_node_page() may load a non-inode block. Let's add a sanity check for such condition to avoid out-of-bounds access issue.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < a67e1bf03c609a751d1740a1789af25e599966fa (git)
Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 67e16ccba74dd8de0a7b10062f1e02d77432f573 (git)
Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 98dbf2af63de0b551082c9bc48333910e009b09f (git)
Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 8b5e5aac44fee122947a269f9034c048e4c295de (git)
Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < ecc461331604b07cdbdb7360dbdf78471653264c (git)
Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < d7242fd7946d4cba0411effb6b5048ca55125747 (git)
Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 6ba8b41d0aa4b82f90f0c416cb53fcef9696525d (git)
Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < e6494977bd4a83862118a05f57a8df40256951c0 (git)
Create a notification for this product.
Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 5.10.237 , ≤ 5.10.* (semver)
Unaffected: 5.15.181 , ≤ 5.15.* (semver)
Unaffected: 6.1.135 , ≤ 6.1.* (semver)
Unaffected: 6.6.88 , ≤ 6.6.* (semver)
Unaffected: 6.12.24 , ≤ 6.12.* (semver)
Unaffected: 6.13.12 , ≤ 6.13.* (semver)
Unaffected: 6.14.3 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid out-of-bounds access in f2fs_truncate_inode_blocks()\n\nsyzbot reports an UBSAN issue as below:\n\n------------[ cut here ]------------\nUBSAN: array-index-out-of-bounds in fs/f2fs/node.h:381:10\nindex 18446744073709550692 is out of range for type \u0027__le32[5]\u0027 (aka \u0027unsigned int[5]\u0027)\nCPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted 6.14.0-rc3-syzkaller-00060-g6537cfb395f3 #0\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n ubsan_epilogue lib/ubsan.c:231 [inline]\n __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:429\n get_nid fs/f2fs/node.h:381 [inline]\n f2fs_truncate_inode_blocks+0xa5e/0xf60 fs/f2fs/node.c:1181\n f2fs_do_truncate_blocks+0x782/0x1030 fs/f2fs/file.c:808\n f2fs_truncate_blocks+0x10d/0x300 fs/f2fs/file.c:836\n f2fs_truncate+0x417/0x720 fs/f2fs/file.c:886\n f2fs_file_write_iter+0x1bdb/0x2550 fs/f2fs/file.c:5093\n aio_write+0x56b/0x7c0 fs/aio.c:1633\n io_submit_one+0x8a7/0x18a0 fs/aio.c:2052\n __do_sys_io_submit fs/aio.c:2111 [inline]\n __se_sys_io_submit+0x171/0x2e0 fs/aio.c:2081\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f238798cde9\n\nindex 18446744073709550692 (decimal, unsigned long long)\n= 0xfffffffffffffc64 (hexadecimal, unsigned long long)\n= -924 (decimal, long long)\n\nIn f2fs_truncate_inode_blocks(), UBSAN detects that get_nid() tries to\naccess .i_nid[-924], it means both offset[0] and level should zero.\n\nThe possible case should be in f2fs_do_truncate_blocks(), we try to\ntruncate inode size to zero, however, dn.ofs_in_node is zero and\ndn.node_page is not an inode page, so it fails to truncate inode page,\nand then pass zeroed free_from to f2fs_truncate_inode_blocks(), result\nin this issue.\n\n\tif (dn.ofs_in_node || IS_INODE(dn.node_page)) {\n\t\tf2fs_truncate_data_blocks_range(\u0026dn, count);\n\t\tfree_from += count;\n\t}\n\nI guess the reason why dn.node_page is not an inode page could be: there\nare multiple nat entries share the same node block address, once the node\nblock address was reused, f2fs_get_node_page() may load a non-inode block.\n\nLet\u0027s add a sanity check for such condition to avoid out-of-bounds access\nissue."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "title": "f2fs: fix to avoid out-of-bounds access in f2fs_truncate_inode_blocks()",
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    "cveId": "CVE-2025-37739",
    "datePublished": "2025-05-01T12:55:48.616Z",
    "dateReserved": "2025-04-16T04:51:23.936Z",
    "dateUpdated": "2026-05-11T21:14:13.683Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2025-37739",
      "date": "2026-06-08",
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    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37739\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-01T13:15:52.500\",\"lastModified\":\"2025-11-04T18:15:57.883\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nf2fs: fix to avoid out-of-bounds access in f2fs_truncate_inode_blocks()\\n\\nsyzbot reports an UBSAN issue as below:\\n\\n------------[ cut here ]------------\\nUBSAN: array-index-out-of-bounds in fs/f2fs/node.h:381:10\\nindex 18446744073709550692 is out of range for type \u0027__le32[5]\u0027 (aka \u0027unsigned int[5]\u0027)\\nCPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted 6.14.0-rc3-syzkaller-00060-g6537cfb395f3 #0\\nCall Trace:\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:94 [inline]\\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\\n ubsan_epilogue lib/ubsan.c:231 [inline]\\n __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:429\\n get_nid fs/f2fs/node.h:381 [inline]\\n f2fs_truncate_inode_blocks+0xa5e/0xf60 fs/f2fs/node.c:1181\\n f2fs_do_truncate_blocks+0x782/0x1030 fs/f2fs/file.c:808\\n f2fs_truncate_blocks+0x10d/0x300 fs/f2fs/file.c:836\\n f2fs_truncate+0x417/0x720 fs/f2fs/file.c:886\\n f2fs_file_write_iter+0x1bdb/0x2550 fs/f2fs/file.c:5093\\n aio_write+0x56b/0x7c0 fs/aio.c:1633\\n io_submit_one+0x8a7/0x18a0 fs/aio.c:2052\\n __do_sys_io_submit fs/aio.c:2111 [inline]\\n __se_sys_io_submit+0x171/0x2e0 fs/aio.c:2081\\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\nRIP: 0033:0x7f238798cde9\\n\\nindex 18446744073709550692 (decimal, unsigned long long)\\n= 0xfffffffffffffc64 (hexadecimal, unsigned long long)\\n= -924 (decimal, long long)\\n\\nIn f2fs_truncate_inode_blocks(), UBSAN detects that get_nid() tries to\\naccess .i_nid[-924], it means both offset[0] and level should zero.\\n\\nThe possible case should be in f2fs_do_truncate_blocks(), we try to\\ntruncate inode size to zero, however, dn.ofs_in_node is zero and\\ndn.node_page is not an inode page, so it fails to truncate inode page,\\nand then pass zeroed free_from to f2fs_truncate_inode_blocks(), result\\nin this issue.\\n\\n\\tif (dn.ofs_in_node || IS_INODE(dn.node_page)) {\\n\\t\\tf2fs_truncate_data_blocks_range(\u0026dn, count);\\n\\t\\tfree_from += count;\\n\\t}\\n\\nI guess the reason why dn.node_page is not an inode page could be: there\\nare multiple nat entries share the same node block address, once the node\\nblock address was reused, f2fs_get_node_page() may load a non-inode block.\\n\\nLet\u0027s add a sanity check for such condition to avoid out-of-bounds access\\nissue.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: f2fs: correcci\u00f3n para evitar el acceso fuera de los l\u00edmites en f2fs_truncate_inode_blocks() syzbot informa un problema de UBSAN como se muestra a continuaci\u00f3n: ------------[ cortar aqu\u00ed ]------------ UBSAN: array-index-out-of-bounds en fs/f2fs/node.h:381:10 el \u00edndice 18446744073709550692 est\u00e1 fuera de rango para el tipo \u0027__le32[5]\u0027 (tambi\u00e9n conocido como \u0027unsigned int[5]\u0027) CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 No contaminado 6.14.0-rc3-syzkaller-00060-g6537cfb395f3 #0 Rastreo de llamadas:  __dump_stack lib/dump_stack.c:94 [en l\u00ednea] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [en l\u00ednea] __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:429 get_nid fs/f2fs/node.h:381 [en l\u00ednea] f2fs_truncate_inode_blocks+0xa5e/0xf60 fs/f2fs/node.c:1181 f2fs_do_truncate_blocks+0x782/0x1030 fs/f2fs/file.c:808 f2fs_truncate_blocks+0x10d/0x300 fs/f2fs/archivo.c:836 f2fs_truncate+0x417/0x720 fs/f2fs/archivo.c:886 f2fs_file_write_iter+0x1bdb/0x2550 fs/f2fs/archivo.c:5093 aio_write+0x56b/0x7c0 fs/aio.c:1633 io_submit_one+0x8a7/0x18a0 fs/aio.c:2052 __do_sys_io_submit fs/aio.c:2111 [en l\u00ednea] __se_sys_io_submit+0x171/0x2e0 fs/aio.c:2081 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f238798cde9 \u00edndice 18446744073709550692 (decimal, unsigned long long) = 0xfffffffffffffc64 (hexadecimal, unsigned long long) = -924 (decimal, long long) En f2fs_truncate_inode_blocks(), UBSAN detecta que get_nid() intenta acceder a .i_nid[-924], lo que significa que tanto offset[0] como level deben ser cero. El caso posible deber\u00eda estar en f2fs_do_truncate_blocks(), tratamos de truncar el tama\u00f1o del inodo a cero, sin embargo, dn.ofs_in_node es cero y dn.node_page no es una p\u00e1gina de inodo, por lo que no puede truncar la p\u00e1gina de inodo y luego pasa free_from en cero a f2fs_truncate_inode_blocks(), lo que da como resultado este problema. if (dn.ofs_in_node || IS_INODE(dn.node_page)) { f2fs_truncate_data_blocks_range(\u0026amp;dn, count); free_from += count; } Supongo que la raz\u00f3n por la que dn.node_page no es una p\u00e1gina de inodo podr\u00eda ser: hay varias entradas nat que comparten la misma direcci\u00f3n de bloque de nodo, una vez que se reutiliz\u00f3 la direcci\u00f3n de bloque de nodo, f2fs_get_node_page() puede cargar un bloque que no sea de inodo. Agreguemos una verificaci\u00f3n de cordura para tal condici\u00f3n para evitar problemas de acceso fuera de los l\u00edmites.\"}],\"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:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.8\",\"versionEndExcluding\":\"5.10.237\",\"matchCriteriaId\":\"8520493E-5B9C-49DE-87BF-6BE97689C7ED\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.181\",\"matchCriteriaId\":\"12331C9E-F601-4EFC-899E-369F98DCC70B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.135\",\"matchCriteriaId\":\"5B9ACE29-7445-4B6F-B761-6367C005E275\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.88\",\"matchCriteriaId\":\"6E5947E5-45E3-462A-829B-382B3B1C61BD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.24\",\"matchCriteriaId\":\"1D35A8A8-F3EC-45E6-AD37-1F154B27529D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.12\",\"matchCriteriaId\":\"4A475784-BF3B-4514-81EE-49C8522FB24A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.14\",\"versionEndExcluding\":\"6.14.3\",\"matchCriteriaId\":\"483E2E15-2135-4EC6-AB64-16282C5EF704\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/67e16ccba74dd8de0a7b10062f1e02d77432f573\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6ba8b41d0aa4b82f90f0c416cb53fcef9696525d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8b5e5aac44fee122947a269f9034c048e4c295de\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/98dbf2af63de0b551082c9bc48333910e009b09f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a67e1bf03c609a751d1740a1789af25e599966fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d7242fd7946d4cba0411effb6b5048ca55125747\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e6494977bd4a83862118a05f57a8df40256951c0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ecc461331604b07cdbdb7360dbdf78471653264c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]}]}}"
  }
}


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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.