CVE-2024-42305 (GCVE-0-2024-42305)

Vulnerability from cvelistv5 – Published: 2024-08-17 09:09 – Updated: 2026-05-12 11:56
VLAI
Title
ext4: check dot and dotdot of dx_root before making dir indexed
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: check dot and dotdot of dx_root before making dir indexed Syzbot reports a issue as follows: ============================================ BUG: unable to handle page fault for address: ffffed11022e24fe PGD 23ffee067 P4D 23ffee067 PUD 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 PID: 5079 Comm: syz-executor306 Not tainted 6.10.0-rc5-g55027e689933 #0 Call Trace: <TASK> make_indexed_dir+0xdaf/0x13c0 fs/ext4/namei.c:2341 ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2451 ext4_rename fs/ext4/namei.c:3936 [inline] ext4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214 [...] ============================================ The immediate cause of this problem is that there is only one valid dentry for the block to be split during do_split, so split==0 results in out of bounds accesses to the map triggering the issue. do_split unsigned split dx_make_map count = 1 split = count/2 = 0; continued = hash2 == map[split - 1].hash; ---> map[4294967295] The maximum length of a filename is 255 and the minimum block size is 1024, so it is always guaranteed that the number of entries is greater than or equal to 2 when do_split() is called. But syzbot's crafted image has no dot and dotdot in dir, and the dentry distribution in dirblock is as follows: bus dentry1 hole dentry2 free |xx--|xx-------------|...............|xx-------------|...............| 0 12 (8+248)=256 268 256 524 (8+256)=264 788 236 1024 So when renaming dentry1 increases its name_len length by 1, neither hole nor free is sufficient to hold the new dentry, and make_indexed_dir() is called. In make_indexed_dir() it is assumed that the first two entries of the dirblock must be dot and dotdot, so bus and dentry1 are left in dx_root because they are treated as dot and dotdot, and only dentry2 is moved to the new leaf block. That's why count is equal to 1. Therefore add the ext4_check_dx_root() helper function to add more sanity checks to dot and dotdot before starting the conversion to avoid the above issue.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < b80575ffa98b5bb3a5d4d392bfe4c2e03e9557db (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < 19e13b4d7f0303186fcc891aba8d0de7c8fdbda8 (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < 42d420517072028fb0eb852c358056b7717ba5aa (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < 8afe06ed3be7a874b3cd82ef5f8959aca8d6429a (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < abb411ac991810c0bcbe51c2e76d2502bf611b5c (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < 9d241b7a39af192d1bb422714a458982c7cc67a2 (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < cdd345321699042ece4a9d2e70754d2397d378c5 (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < 50ea741def587a64e08879ce6c6a30131f7111e7 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.19
Unaffected: 0 , < 2.6.19 (semver)
Unaffected: 4.19.320 , ≤ 4.19.* (semver)
Unaffected: 5.4.282 , ≤ 5.4.* (semver)
Unaffected: 5.10.224 , ≤ 5.10.* (semver)
Unaffected: 5.15.165 , ≤ 5.15.* (semver)
Unaffected: 6.1.103 , ≤ 6.1.* (semver)
Unaffected: 6.6.44 , ≤ 6.6.* (semver)
Unaffected: 6.10.3 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: check dot and dotdot of dx_root before making dir indexed\n\nSyzbot reports a issue as follows:\n============================================\nBUG: unable to handle page fault for address: ffffed11022e24fe\nPGD 23ffee067 P4D 23ffee067 PUD 0\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI\nCPU: 0 PID: 5079 Comm: syz-executor306 Not tainted 6.10.0-rc5-g55027e689933 #0\nCall Trace:\n \u003cTASK\u003e\n make_indexed_dir+0xdaf/0x13c0 fs/ext4/namei.c:2341\n ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2451\n ext4_rename fs/ext4/namei.c:3936 [inline]\n ext4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214\n[...]\n============================================\n\nThe immediate cause of this problem is that there is only one valid dentry\nfor the block to be split during do_split, so split==0 results in out of\nbounds accesses to the map triggering the issue.\n\n    do_split\n      unsigned split\n      dx_make_map\n       count = 1\n      split = count/2 = 0;\n      continued = hash2 == map[split - 1].hash;\n       ---\u003e map[4294967295]\n\nThe maximum length of a filename is 255 and the minimum block size is 1024,\nso it is always guaranteed that the number of entries is greater than or\nequal to 2 when do_split() is called.\n\nBut syzbot\u0027s crafted image has no dot and dotdot in dir, and the dentry\ndistribution in dirblock is as follows:\n\n  bus     dentry1          hole           dentry2           free\n|xx--|xx-------------|...............|xx-------------|...............|\n0   12 (8+248)=256  268     256     524 (8+256)=264 788     236     1024\n\nSo when renaming dentry1 increases its name_len length by 1, neither hole\nnor free is sufficient to hold the new dentry, and make_indexed_dir() is\ncalled.\n\nIn make_indexed_dir() it is assumed that the first two entries of the\ndirblock must be dot and dotdot, so bus and dentry1 are left in dx_root\nbecause they are treated as dot and dotdot, and only dentry2 is moved\nto the new leaf block. That\u0027s why count is equal to 1.\n\nTherefore add the ext4_check_dx_root() helper function to add more sanity\nchecks to dot and dotdot before starting the conversion to avoid the above\nissue."
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: check dot and dotdot of dx_root before making dir indexed\\n\\nSyzbot reports a issue as follows:\\n============================================\\nBUG: unable to handle page fault for address: ffffed11022e24fe\\nPGD 23ffee067 P4D 23ffee067 PUD 0\\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI\\nCPU: 0 PID: 5079 Comm: syz-executor306 Not tainted 6.10.0-rc5-g55027e689933 #0\\nCall Trace:\\n \u003cTASK\u003e\\n make_indexed_dir+0xdaf/0x13c0 fs/ext4/namei.c:2341\\n ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2451\\n ext4_rename fs/ext4/namei.c:3936 [inline]\\n ext4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214\\n[...]\\n============================================\\n\\nThe immediate cause of this problem is that there is only one valid dentry\\nfor the block to be split during do_split, so split==0 results in out of\\nbounds accesses to the map triggering the issue.\\n\\n    do_split\\n      unsigned split\\n      dx_make_map\\n       count = 1\\n      split = count/2 = 0;\\n      continued = hash2 == map[split - 1].hash;\\n       ---\u003e map[4294967295]\\n\\nThe maximum length of a filename is 255 and the minimum block size is 1024,\\nso it is always guaranteed that the number of entries is greater than or\\nequal to 2 when do_split() is called.\\n\\nBut syzbot\u0027s crafted image has no dot and dotdot in dir, and the dentry\\ndistribution in dirblock is as follows:\\n\\n  bus     dentry1          hole           dentry2           free\\n|xx--|xx-------------|...............|xx-------------|...............|\\n0   12 (8+248)=256  268     256     524 (8+256)=264 788     236     1024\\n\\nSo when renaming dentry1 increases its name_len length by 1, neither hole\\nnor free is sufficient to hold the new dentry, and make_indexed_dir() is\\ncalled.\\n\\nIn make_indexed_dir() it is assumed that the first two entries of the\\ndirblock must be dot and dotdot, so bus and dentry1 are left in dx_root\\nbecause they are treated as dot and dotdot, and only dentry2 is moved\\nto the new leaf block. That\u0027s why count is equal to 1.\\n\\nTherefore add the ext4_check_dx_root() helper function to add more sanity\\nchecks to dot and dotdot before starting the conversion to avoid the above\\nissue.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: verifique el punto y el punto de dx_root antes de indexar el directorio Syzbot informa un problema de la siguiente manera: =================== ========================= ERROR: no se puede manejar el error de p\\u00e1gina para la direcci\\u00f3n: ffffed11022e24fe PGD 23ffee067 P4D 23ffee067 PUD 0 Ups: Ups: 0000 [#1 ] PREEMPT SMP KASAN PTI CPU: 0 PID: 5079 Comm: syz-executor306 No contaminado 6.10.0-rc5-g55027e689933 #0 Seguimiento de llamada:  make_indexed_dir+0xdaf/0x13c0 fs/ext4/namei.c:2341 ext4_add_entry+0x222 un /0x25d0 fs/ext4/namei.c:2451 ext4_rename fs/ext4/namei.c:3936 [en l\\u00ednea] text4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214 [...] ======= ====================================== La causa inmediata de este problema es que s\\u00f3lo hay una v\\u00e1lida dentry para que el bloque se divida durante do_split, por lo que split==0 da como resultado accesos fuera de los l\\u00edmites al mapa que desencadenan el problema. do_split divisi\\u00f3n sin signo dx_make_map recuento = 1 divisi\\u00f3n = recuento/2 = 0; contin\\u00faa = hash2 == mapa[dividido - 1].hash; ---\u0026gt; map[4294967295] La longitud m\\u00e1xima de un nombre de archivo es 255 y el tama\\u00f1o m\\u00ednimo de bloque es 1024, por lo que siempre se garantiza que el n\\u00famero de entradas sea mayor o igual a 2 cuando se llama a do_split(). Pero la imagen manipulada por syzbot no tiene punto ni puntopunto en el directorio, y la distribuci\\u00f3n de dentry en dirblock es la siguiente: bus dentry1 agujero dentry2 gratis |xx--|xx-------------|... ............|xx-------------|...............| 0 12 (8+248)=256 268 256 524 (8+256)=264 788 236 1024 Entonces, cuando se cambia el nombre de dentry1 se aumenta la longitud de name_len en 1, ni el agujero ni el espacio libre son suficientes para contener el nuevo dentry, y make_indexed_dir() es llamado. En make_indexed_dir() se supone que las dos primeras entradas del bloque de directorios deben ser punto y puntopunto, por lo que bus y dentry1 se dejan en dx_root porque se tratan como punto y puntodot, y solo dentry2 se mueve al nuevo bloque de hoja. Es por eso que el recuento es igual a 1. Por lo tanto, agregue la funci\\u00f3n auxiliar ext4_check_dx_root() para agregar m\\u00e1s controles de cordura a los puntos y puntos antes de comenzar la conversi\\u00f3n para evitar el problema anterior.\"}]",
      "id": "CVE-2024-42305",
      "lastModified": "2024-08-19T12:59:59.177",
      "published": "2024-08-17T09:15:10.690",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/19e13b4d7f0303186fcc891aba8d0de7c8fdbda8\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/42d420517072028fb0eb852c358056b7717ba5aa\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/50ea741def587a64e08879ce6c6a30131f7111e7\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/8afe06ed3be7a874b3cd82ef5f8959aca8d6429a\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/9d241b7a39af192d1bb422714a458982c7cc67a2\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/abb411ac991810c0bcbe51c2e76d2502bf611b5c\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/b80575ffa98b5bb3a5d4d392bfe4c2e03e9557db\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/cdd345321699042ece4a9d2e70754d2397d378c5\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-42305\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-08-17T09:15:10.690\",\"lastModified\":\"2026-05-12T12:17:06.447\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: check dot and dotdot of dx_root before making dir indexed\\n\\nSyzbot reports a issue as follows:\\n============================================\\nBUG: unable to handle page fault for address: ffffed11022e24fe\\nPGD 23ffee067 P4D 23ffee067 PUD 0\\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI\\nCPU: 0 PID: 5079 Comm: syz-executor306 Not tainted 6.10.0-rc5-g55027e689933 #0\\nCall Trace:\\n \u003cTASK\u003e\\n make_indexed_dir+0xdaf/0x13c0 fs/ext4/namei.c:2341\\n ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2451\\n ext4_rename fs/ext4/namei.c:3936 [inline]\\n ext4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214\\n[...]\\n============================================\\n\\nThe immediate cause of this problem is that there is only one valid dentry\\nfor the block to be split during do_split, so split==0 results in out of\\nbounds accesses to the map triggering the issue.\\n\\n    do_split\\n      unsigned split\\n      dx_make_map\\n       count = 1\\n      split = count/2 = 0;\\n      continued = hash2 == map[split - 1].hash;\\n       ---\u003e map[4294967295]\\n\\nThe maximum length of a filename is 255 and the minimum block size is 1024,\\nso it is always guaranteed that the number of entries is greater than or\\nequal to 2 when do_split() is called.\\n\\nBut syzbot\u0027s crafted image has no dot and dotdot in dir, and the dentry\\ndistribution in dirblock is as follows:\\n\\n  bus     dentry1          hole           dentry2           free\\n|xx--|xx-------------|...............|xx-------------|...............|\\n0   12 (8+248)=256  268     256     524 (8+256)=264 788     236     1024\\n\\nSo when renaming dentry1 increases its name_len length by 1, neither hole\\nnor free is sufficient to hold the new dentry, and make_indexed_dir() is\\ncalled.\\n\\nIn make_indexed_dir() it is assumed that the first two entries of the\\ndirblock must be dot and dotdot, so bus and dentry1 are left in dx_root\\nbecause they are treated as dot and dotdot, and only dentry2 is moved\\nto the new leaf block. That\u0027s why count is equal to 1.\\n\\nTherefore add the ext4_check_dx_root() helper function to add more sanity\\nchecks to dot and dotdot before starting the conversion to avoid the above\\nissue.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: verifique el punto y el punto de dx_root antes de indexar el directorio Syzbot informa un problema de la siguiente manera: =================== ========================= ERROR: no se puede manejar el error de p\u00e1gina para la direcci\u00f3n: ffffed11022e24fe PGD 23ffee067 P4D 23ffee067 PUD 0 Ups: Ups: 0000 [#1 ] PREEMPT SMP KASAN PTI CPU: 0 PID: 5079 Comm: syz-executor306 No contaminado 6.10.0-rc5-g55027e689933 #0 Seguimiento de llamada:  make_indexed_dir+0xdaf/0x13c0 fs/ext4/namei.c:2341 ext4_add_entry+0x222 un /0x25d0 fs/ext4/namei.c:2451 ext4_rename fs/ext4/namei.c:3936 [en l\u00ednea] text4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214 [...] ======= ====================================== La causa inmediata de este problema es que s\u00f3lo hay una v\u00e1lida dentry para que el bloque se divida durante do_split, por lo que split==0 da como resultado accesos fuera de los l\u00edmites al mapa que desencadenan el problema. do_split divisi\u00f3n sin signo dx_make_map recuento = 1 divisi\u00f3n = recuento/2 = 0; contin\u00faa = hash2 == mapa[dividido - 1].hash; ---\u0026gt; map[4294967295] La longitud m\u00e1xima de un nombre de archivo es 255 y el tama\u00f1o m\u00ednimo de bloque es 1024, por lo que siempre se garantiza que el n\u00famero de entradas sea mayor o igual a 2 cuando se llama a do_split(). Pero la imagen manipulada por syzbot no tiene punto ni puntopunto en el directorio, y la distribuci\u00f3n de dentry en dirblock es la siguiente: bus dentry1 agujero dentry2 gratis |xx--|xx-------------|... ............|xx-------------|...............| 0 12 (8+248)=256 268 256 524 (8+256)=264 788 236 1024 Entonces, cuando se cambia el nombre de dentry1 se aumenta la longitud de name_len en 1, ni el agujero ni el espacio libre son suficientes para contener el nuevo dentry, y make_indexed_dir() es llamado. En make_indexed_dir() se supone que las dos primeras entradas del bloque de directorios deben ser punto y puntopunto, por lo que bus y dentry1 se dejan en dx_root porque se tratan como punto y puntodot, y solo dentry2 se mueve al nuevo bloque de hoja. Es por eso que el recuento es igual a 1. Por lo tanto, agregue la funci\u00f3n auxiliar ext4_check_dx_root() para agregar m\u00e1s controles de cordura a los puntos y puntos antes de comenzar la conversi\u00f3n para evitar el problema anterior.\"}],\"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-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.20\",\"versionEndExcluding\":\"4.19.320\",\"matchCriteriaId\":\"1F2DB4BC-32AC-42D5-A39A-FF732AB5FC96\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.282\",\"matchCriteriaId\":\"A8961D98-9ACF-4188-BA88-44038B14BC28\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.224\",\"matchCriteriaId\":\"5CCEDF13-293D-4E64-B501-4409D0365AFE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.165\",\"matchCriteriaId\":\"B4E2B568-3171-41DE-B519-F2B1A3600D94\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.103\",\"matchCriteriaId\":\"E45EAC72-8329-4F99-8276-86AF9BB3496A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.44\",\"matchCriteriaId\":\"CC912330-6B41-4C6B-99AF-F3857FBACB6A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.3\",\"matchCriteriaId\":\"92D388F2-1EAF-4CFA-AC06-5B26D762EA7D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:2.6.19:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"9E2DBD4C-9DD9-4DD3-87CB-A0070A789CEA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:2.6.19:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"8D97ED16-D6B7-4445-889C-4D6DE2EDC49A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:2.6.19:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"B2C2D5D4-9A4B-4CDF-8D71-D22EB5E97D5A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:2.6.19:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"DFFB2843-A867-48EC-97D7-B106C7BBAED0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:2.6.19:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"3CD3FE23-1A10-47E6-AD7E-D67F1BE3C5E2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:2.6.19:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"9F39FC76-7D77-4064-94D3-A16C436FA8D1\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/19e13b4d7f0303186fcc891aba8d0de7c8fdbda8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/42d420517072028fb0eb852c358056b7717ba5aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/50ea741def587a64e08879ce6c6a30131f7111e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8afe06ed3be7a874b3cd82ef5f8959aca8d6429a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9d241b7a39af192d1bb422714a458982c7cc67a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/abb411ac991810c0bcbe51c2e76d2502bf611b5c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b80575ffa98b5bb3a5d4d392bfe4c2e03e9557db\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cdd345321699042ece4a9d2e70754d2397d378c5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-42305\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T16:10:19.161352Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:23.520Z\"}}], \"cna\": {\"title\": \"ext4: check dot and dotdot of dx_root before making dir indexed\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ac27a0ec112a089f1a5102bc8dffc79c8c815571\", \"lessThan\": \"b80575ffa98b5bb3a5d4d392bfe4c2e03e9557db\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac27a0ec112a089f1a5102bc8dffc79c8c815571\", \"lessThan\": \"19e13b4d7f0303186fcc891aba8d0de7c8fdbda8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac27a0ec112a089f1a5102bc8dffc79c8c815571\", \"lessThan\": \"42d420517072028fb0eb852c358056b7717ba5aa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac27a0ec112a089f1a5102bc8dffc79c8c815571\", \"lessThan\": \"8afe06ed3be7a874b3cd82ef5f8959aca8d6429a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac27a0ec112a089f1a5102bc8dffc79c8c815571\", \"lessThan\": \"abb411ac991810c0bcbe51c2e76d2502bf611b5c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac27a0ec112a089f1a5102bc8dffc79c8c815571\", \"lessThan\": \"9d241b7a39af192d1bb422714a458982c7cc67a2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac27a0ec112a089f1a5102bc8dffc79c8c815571\", \"lessThan\": \"cdd345321699042ece4a9d2e70754d2397d378c5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac27a0ec112a089f1a5102bc8dffc79c8c815571\", \"lessThan\": \"50ea741def587a64e08879ce6c6a30131f7111e7\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ext4/namei.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.19\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.19\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.320\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.282\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.224\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.165\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.103\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.44\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/namei.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b80575ffa98b5bb3a5d4d392bfe4c2e03e9557db\"}, {\"url\": \"https://git.kernel.org/stable/c/19e13b4d7f0303186fcc891aba8d0de7c8fdbda8\"}, {\"url\": \"https://git.kernel.org/stable/c/42d420517072028fb0eb852c358056b7717ba5aa\"}, {\"url\": \"https://git.kernel.org/stable/c/8afe06ed3be7a874b3cd82ef5f8959aca8d6429a\"}, {\"url\": 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ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2451\\n ext4_rename fs/ext4/namei.c:3936 [inline]\\n ext4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214\\n[...]\\n============================================\\n\\nThe immediate cause of this problem is that there is only one valid dentry\\nfor the block to be split during do_split, so split==0 results in out of\\nbounds accesses to the map triggering the issue.\\n\\n    do_split\\n      unsigned split\\n      dx_make_map\\n       count = 1\\n      split = count/2 = 0;\\n      continued = hash2 == map[split - 1].hash;\\n       ---\u003e map[4294967295]\\n\\nThe maximum length of a filename is 255 and the minimum block size is 1024,\\nso it is always guaranteed that the number of entries is greater than or\\nequal to 2 when do_split() is called.\\n\\nBut syzbot\u0027s crafted image has no dot and dotdot in dir, and the dentry\\ndistribution in dirblock is as follows:\\n\\n  bus     dentry1          hole           dentry2           free\\n|xx--|xx-------------|...............|xx-------------|...............|\\n0   12 (8+248)=256  268     256     524 (8+256)=264 788     236     1024\\n\\nSo when renaming dentry1 increases its name_len length by 1, neither hole\\nnor free is sufficient to hold the new dentry, and make_indexed_dir() is\\ncalled.\\n\\nIn make_indexed_dir() it is assumed that the first two entries of the\\ndirblock must be dot and dotdot, so bus and dentry1 are left in dx_root\\nbecause they are treated as dot and dotdot, and only dentry2 is moved\\nto the new leaf block. That\u0027s why count is equal to 1.\\n\\nTherefore add the ext4_check_dx_root() helper function to add more sanity\\nchecks to dot and dotdot before starting the conversion to avoid the above\\nissue.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.320\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.282\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.224\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.165\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.103\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.44\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.3\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11\", \"versionStartIncluding\": \"2.6.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:26:23.871Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-42305\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T09:26:23.871Z\", \"dateReserved\": \"2024-07-30T07:40:12.273Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-17T09:09:11.296Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Taxonomy of the tags.




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.