CVE-2024-50015 (GCVE-0-2024-50015)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:54 – Updated: 2026-05-12 11:59
VLAI?
Title
ext4: dax: fix overflowing extents beyond inode size when partially writing
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: dax: fix overflowing extents beyond inode size when partially writing The dax_iomap_rw() does two things in each iteration: map written blocks and copy user data to blocks. If the process is killed by user(See signal handling in dax_iomap_iter()), the copied data will be returned and added on inode size, which means that the length of written extents may exceed the inode size, then fsck will fail. An example is given as: dd if=/dev/urandom of=file bs=4M count=1 dax_iomap_rw iomap_iter // round 1 ext4_iomap_begin ext4_iomap_alloc // allocate 0~2M extents(written flag) dax_iomap_iter // copy 2M data iomap_iter // round 2 iomap_iter_advance iter->pos += iter->processed // iter->pos = 2M ext4_iomap_begin ext4_iomap_alloc // allocate 2~4M extents(written flag) dax_iomap_iter fatal_signal_pending done = iter->pos - iocb->ki_pos // done = 2M ext4_handle_inode_extension ext4_update_inode_size // inode size = 2M fsck reports: Inode 13, i_size is 2097152, should be 4194304. Fix? Fix the problem by truncating extents if the written length is smaller than expected.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 776722e85d3b0936253ecc3d14db4fba37f191ba , < f8a7c342326f6ad1dfdb30a18dd013c70f5e9669 (git)
Affected: 776722e85d3b0936253ecc3d14db4fba37f191ba , < 8c30a9a8610c314554997f86370140746aa35661 (git)
Affected: 776722e85d3b0936253ecc3d14db4fba37f191ba , < abfaa876b948baaea4d14f21a1963789845c8b4c (git)
Affected: 776722e85d3b0936253ecc3d14db4fba37f191ba , < 5efccdee4a7d507a483f20f880b809cc4eaef14d (git)
Affected: 776722e85d3b0936253ecc3d14db4fba37f191ba , < a9f331f51515bdb3ebc8d0963131af367ef468f6 (git)
Affected: 776722e85d3b0936253ecc3d14db4fba37f191ba , < ec0dd451e236c46e4858d53e9e82bae7797a7af5 (git)
Affected: 776722e85d3b0936253ecc3d14db4fba37f191ba , < dda898d7ffe85931f9cca6d702a51f33717c501e (git)
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Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 5.10.227 , ≤ 5.10.* (semver)
Unaffected: 5.15.168 , ≤ 5.15.* (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.55 , ≤ 6.6.* (semver)
Unaffected: 6.10.14 , ≤ 6.10.* (semver)
Unaffected: 6.11.3 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-50015\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T19:15:04.890\",\"lastModified\":\"2026-05-12T13:16:15.580\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: dax: fix overflowing extents beyond inode size when partially writing\\n\\nThe dax_iomap_rw() does two things in each iteration: map written blocks\\nand copy user data to blocks. If the process is killed by user(See signal\\nhandling in dax_iomap_iter()), the copied data will be returned and added\\non inode size, which means that the length of written extents may exceed\\nthe inode size, then fsck will fail. An example is given as:\\n\\ndd if=/dev/urandom of=file bs=4M count=1\\n dax_iomap_rw\\n  iomap_iter // round 1\\n   ext4_iomap_begin\\n    ext4_iomap_alloc // allocate 0~2M extents(written flag)\\n  dax_iomap_iter // copy 2M data\\n  iomap_iter // round 2\\n   iomap_iter_advance\\n    iter-\u003epos += iter-\u003eprocessed // iter-\u003epos = 2M\\n   ext4_iomap_begin\\n    ext4_iomap_alloc // allocate 2~4M extents(written flag)\\n  dax_iomap_iter\\n   fatal_signal_pending\\n  done = iter-\u003epos - iocb-\u003eki_pos // done = 2M\\n ext4_handle_inode_extension\\n  ext4_update_inode_size // inode size = 2M\\n\\nfsck reports: Inode 13, i_size is 2097152, should be 4194304.  Fix?\\n\\nFix the problem by truncating extents if the written length is smaller\\nthan expected.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: dax: se corrige el desbordamiento de extensiones m\u00e1s all\u00e1 del tama\u00f1o del inodo al escribir parcialmente. Dax_iomap_rw() hace dos cosas en cada iteraci\u00f3n: asigna bloques escritos y copia datos de usuario a bloques. Si el usuario finaliza el proceso (consulte el manejo de se\u00f1ales en dax_iomap_iter()), los datos copiados se devolver\u00e1n y se agregar\u00e1n al tama\u00f1o del inodo, lo que significa que la longitud de las extensiones escritas puede exceder el tama\u00f1o del inodo, entonces fsck fallar\u00e1. Se proporciona un ejemplo como: dd if=/dev/urandom of=file bs=4M count=1 dax_iomap_rw iomap_iter // ronda 1 ext4_iomap_begin ext4_iomap_alloc // asignar 0~2M de extensiones (bandera escrita) dax_iomap_iter // copiar 2M de datos iomap_iter // ronda 2 iomap_iter_advance iter-\u0026gt;pos += iter-\u0026gt;processed // iter-\u0026gt;pos = 2M ext4_iomap_begin ext4_iomap_alloc // asignar 2~4M de extensiones (bandera escrita) dax_iomap_iter fatal_signal_pending hecho = iter-\u0026gt;pos - iocb-\u0026gt;ki_pos // hecho = 2M ext4_handle_inode_extension ext4_update_inode_size // tama\u00f1o de inodo = 2M fsck informa: Inodo 13, i_size es 2097152, deber\u00eda ser 4194304. \u00bfSoluci\u00f3n? Solucione el problema truncando las extensiones si la longitud escrita es menor a la esperada.\"}],\"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\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.10\",\"versionEndExcluding\":\"5.10.227\",\"matchCriteriaId\":\"3CDEE58F-38CA-430D-99B5-73349FB2715F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.168\",\"matchCriteriaId\":\"4D51C05D-455B-4D8D-89E7-A58E140B864C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.113\",\"matchCriteriaId\":\"D01BD22E-ACD1-4618-9D01-6116570BE1EE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.55\",\"matchCriteriaId\":\"E90B9576-56C4-47BC-AAB0-C5B2D438F5D0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.14\",\"matchCriteriaId\":\"4C16BCE0-FFA0-4599-BE0A-1FD65101C021\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.11.3\",\"matchCriteriaId\":\"54D9C704-D679-41A7-9C40-10A6B1E7FFE9\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5efccdee4a7d507a483f20f880b809cc4eaef14d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8c30a9a8610c314554997f86370140746aa35661\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a9f331f51515bdb3ebc8d0963131af367ef468f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/abfaa876b948baaea4d14f21a1963789845c8b4c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dda898d7ffe85931f9cca6d702a51f33717c501e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ec0dd451e236c46e4858d53e9e82bae7797a7af5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f8a7c342326f6ad1dfdb30a18dd013c70f5e9669\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-355557.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "vulnrichment": {
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GNU/Linux subsystem\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-355557.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-05-12T11:59:48.118Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-50015\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:28:08.580885Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:28:11.693Z\"}}], \"cna\": {\"title\": \"ext4: dax: fix overflowing extents beyond inode size when partially writing\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"776722e85d3b0936253ecc3d14db4fba37f191ba\", \"lessThan\": \"f8a7c342326f6ad1dfdb30a18dd013c70f5e9669\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"776722e85d3b0936253ecc3d14db4fba37f191ba\", \"lessThan\": \"8c30a9a8610c314554997f86370140746aa35661\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"776722e85d3b0936253ecc3d14db4fba37f191ba\", \"lessThan\": \"abfaa876b948baaea4d14f21a1963789845c8b4c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"776722e85d3b0936253ecc3d14db4fba37f191ba\", \"lessThan\": \"5efccdee4a7d507a483f20f880b809cc4eaef14d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"776722e85d3b0936253ecc3d14db4fba37f191ba\", \"lessThan\": \"a9f331f51515bdb3ebc8d0963131af367ef468f6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"776722e85d3b0936253ecc3d14db4fba37f191ba\", \"lessThan\": \"ec0dd451e236c46e4858d53e9e82bae7797a7af5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"776722e85d3b0936253ecc3d14db4fba37f191ba\", \"lessThan\": \"dda898d7ffe85931f9cca6d702a51f33717c501e\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ext4/file.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.10\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.227\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.113\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.55\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/file.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f8a7c342326f6ad1dfdb30a18dd013c70f5e9669\"}, {\"url\": \"https://git.kernel.org/stable/c/8c30a9a8610c314554997f86370140746aa35661\"}, {\"url\": \"https://git.kernel.org/stable/c/abfaa876b948baaea4d14f21a1963789845c8b4c\"}, {\"url\": \"https://git.kernel.org/stable/c/5efccdee4a7d507a483f20f880b809cc4eaef14d\"}, {\"url\": \"https://git.kernel.org/stable/c/a9f331f51515bdb3ebc8d0963131af367ef468f6\"}, {\"url\": \"https://git.kernel.org/stable/c/ec0dd451e236c46e4858d53e9e82bae7797a7af5\"}, {\"url\": \"https://git.kernel.org/stable/c/dda898d7ffe85931f9cca6d702a51f33717c501e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: dax: fix overflowing extents beyond inode size when partially writing\\n\\nThe dax_iomap_rw() does two things in each iteration: map written blocks\\nand copy user data to blocks. If the process is killed by user(See signal\\nhandling in dax_iomap_iter()), the copied data will be returned and added\\non inode size, which means that the length of written extents may exceed\\nthe inode size, then fsck will fail. An example is given as:\\n\\ndd if=/dev/urandom of=file bs=4M count=1\\n dax_iomap_rw\\n  iomap_iter // round 1\\n   ext4_iomap_begin\\n    ext4_iomap_alloc // allocate 0~2M extents(written flag)\\n  dax_iomap_iter // copy 2M data\\n  iomap_iter // round 2\\n   iomap_iter_advance\\n    iter-\u003epos += iter-\u003eprocessed // iter-\u003epos = 2M\\n   ext4_iomap_begin\\n    ext4_iomap_alloc // allocate 2~4M extents(written flag)\\n  dax_iomap_iter\\n   fatal_signal_pending\\n  done = iter-\u003epos - iocb-\u003eki_pos // done = 2M\\n ext4_handle_inode_extension\\n  ext4_update_inode_size // inode size = 2M\\n\\nfsck reports: Inode 13, i_size is 2097152, should be 4194304.  Fix?\\n\\nFix the problem by truncating extents if the written length is smaller\\nthan expected.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.227\", \"versionStartIncluding\": \"4.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.168\", \"versionStartIncluding\": \"4.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.113\", \"versionStartIncluding\": \"4.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.55\", \"versionStartIncluding\": \"4.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.14\", \"versionStartIncluding\": \"4.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.3\", \"versionStartIncluding\": \"4.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"4.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T20:43:53.836Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-50015\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-12T11:59:48.118Z\", \"dateReserved\": \"2024-10-21T12:17:06.062Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:54:06.465Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.