CVE-2022-48988 (GCVE-0-2022-48988)

Vulnerability from cvelistv5 – Published: 2024-10-21 20:06 – Updated: 2026-05-11 18:51
VLAI
Title
memcg: fix possible use-after-free in memcg_write_event_control()
Summary
In the Linux kernel, the following vulnerability has been resolved: memcg: fix possible use-after-free in memcg_write_event_control() memcg_write_event_control() accesses the dentry->d_name of the specified control fd to route the write call. As a cgroup interface file can't be renamed, it's safe to access d_name as long as the specified file is a regular cgroup file. Also, as these cgroup interface files can't be removed before the directory, it's safe to access the parent too. Prior to 347c4a874710 ("memcg: remove cgroup_event->cft"), there was a call to __file_cft() which verified that the specified file is a regular cgroupfs file before further accesses. The cftype pointer returned from __file_cft() was no longer necessary and the commit inadvertently dropped the file type check with it allowing any file to slip through. With the invarients broken, the d_name and parent accesses can now race against renames and removals of arbitrary files and cause use-after-free's. Fix the bug by resurrecting the file type check in __file_cft(). Now that cgroupfs is implemented through kernfs, checking the file operations needs to go through a layer of indirection. Instead, let's check the superblock and dentry type.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 347c4a8747104a945ecced358944e42879176ca5 , < b77600e26fd48727a95ffd50ba1e937efb548125 (git)
Affected: 347c4a8747104a945ecced358944e42879176ca5 , < e1ae97624ecf400ea56c238bff23e5cd139df0b8 (git)
Affected: 347c4a8747104a945ecced358944e42879176ca5 , < 35963b31821920908e397146502066f6b032c917 (git)
Affected: 347c4a8747104a945ecced358944e42879176ca5 , < f1f7f36cf682fa59db15e2089039a2eeb58ff2ad (git)
Affected: 347c4a8747104a945ecced358944e42879176ca5 , < aad8bbd17a1d586005feb9226c2e9cfce1432e13 (git)
Affected: 347c4a8747104a945ecced358944e42879176ca5 , < 0ed074317b835caa6c03bcfa8f133365324673dc (git)
Affected: 347c4a8747104a945ecced358944e42879176ca5 , < 4a7ba45b1a435e7097ca0f79a847d0949d0eb088 (git)
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Linux Linux Affected: 3.14
Unaffected: 0 , < 3.14 (semver)
Unaffected: 4.14.302 , ≤ 4.14.* (semver)
Unaffected: 4.19.269 , ≤ 4.19.* (semver)
Unaffected: 5.4.227 , ≤ 5.4.* (semver)
Unaffected: 5.10.159 , ≤ 5.10.* (semver)
Unaffected: 5.15.83 , ≤ 5.15.* (semver)
Unaffected: 6.0.13 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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      "id": "CVE-2022-48988",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48988\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T20:15:10.710\",\"lastModified\":\"2024-11-01T15:20:42.073\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmemcg: fix possible use-after-free in memcg_write_event_control()\\n\\nmemcg_write_event_control() accesses the dentry-\u003ed_name of the specified\\ncontrol fd to route the write call.  As a cgroup interface file can\u0027t be\\nrenamed, it\u0027s safe to access d_name as long as the specified file is a\\nregular cgroup file.  Also, as these cgroup interface files can\u0027t be\\nremoved before the directory, it\u0027s safe to access the parent too.\\n\\nPrior to 347c4a874710 (\\\"memcg: remove cgroup_event-\u003ecft\\\"), there was a\\ncall to __file_cft() which verified that the specified file is a regular\\ncgroupfs file before further accesses.  The cftype pointer returned from\\n__file_cft() was no longer necessary and the commit inadvertently dropped\\nthe file type check with it allowing any file to slip through.  With the\\ninvarients broken, the d_name and parent accesses can now race against\\nrenames and removals of arbitrary files and cause use-after-free\u0027s.\\n\\nFix the bug by resurrecting the file type check in __file_cft().  Now that\\ncgroupfs is implemented through kernfs, checking the file operations needs\\nto go through a layer of indirection.  Instead, let\u0027s check the superblock\\nand dentry type.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: memcg: corregir posible use after free en memcg_write_event_control() memcg_write_event_control() accede a dentry-\u0026gt;d_name del fd de control especificado para enrutar la llamada de escritura. Como no se puede cambiar el nombre de un archivo de interfaz de cgroup, es seguro acceder a d_name siempre que el archivo especificado sea un archivo cgroup normal. Adem\u00e1s, como estos archivos de interfaz de cgroup no se pueden eliminar antes del directorio, tambi\u00e9n es seguro acceder al padre. Antes de 347c4a874710 (\\\"memcg: eliminar cgroup_event-\u0026gt;cft\\\"), hab\u00eda una llamada a __file_cft() que verificaba que el archivo especificado es un archivo cgroupfs normal antes de futuros accesos. El puntero cftype devuelto desde __file_cft() ya no era necesario y el commit elimin\u00f3 inadvertidamente la verificaci\u00f3n del tipo de archivo, lo que permiti\u00f3 que cualquier archivo se deslizara. Con las invariantes rotas, los accesos a d_name y a los padres ahora pueden competir contra los cambios de nombre y las eliminaciones de archivos arbitrarios y causar use-after-free. Corrija el error resucitando la comprobaci\u00f3n del tipo de archivo en __file_cft(). Ahora que cgroupfs est\u00e1 implementado a trav\u00e9s de kernfs, la comprobaci\u00f3n de las operaciones de archivo debe pasar por una capa de indirecci\u00f3n. En su lugar, verifiquemos el tipo de superbloque y dentry.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.0,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.14\",\"versionEndExcluding\":\"4.14.302\",\"matchCriteriaId\":\"E107E1CA-F309-4B44-AB1F-DC3086D3F588\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.269\",\"matchCriteriaId\":\"1185B8E3-712E-4BFB-BD01-78D47F7EF1F2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.227\",\"matchCriteriaId\":\"8C752145-904B-474A-A7F2-E9F29353B0FE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.159\",\"matchCriteriaId\":\"7318B597-DFFD-4BBC-A947-539D6E30D82A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.83\",\"matchCriteriaId\":\"90897BD1-104D-4CFF-94F5-29F9041217FB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.0.13\",\"matchCriteriaId\":\"389392A7-81C4-4C26-884B-8C7CF0F53DA4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"E7E331DA-1FB0-4DEC-91AC-7DA69D461C11\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"17F0B248-42CF-4AE6-A469-BB1BAE7F4705\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"E2422816-0C14-4B5E-A1E6-A9D776E5C49B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"1C6E00FE-5FB9-4D20-A1A1-5A32128F9B76\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"35B26BE4-43A6-4A36-A7F6-5B3F572D9186\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3FFFB0B3-930D-408A-91E2-BAE0C2715D80\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"8535320E-A0DB-4277-800E-D0CE5BBA59E8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc8:*:*:*:*:*:*\",\"matchCriteriaId\":\"21718AA4-4056-40F2-968E-BDAA465A7872\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0ed074317b835caa6c03bcfa8f133365324673dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/35963b31821920908e397146502066f6b032c917\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4a7ba45b1a435e7097ca0f79a847d0949d0eb088\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/aad8bbd17a1d586005feb9226c2e9cfce1432e13\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b77600e26fd48727a95ffd50ba1e937efb548125\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e1ae97624ecf400ea56c238bff23e5cd139df0b8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f1f7f36cf682fa59db15e2089039a2eeb58ff2ad\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-48988\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:16:57.577077Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:17:00.743Z\"}}], \"cna\": {\"title\": \"memcg: fix possible use-after-free in memcg_write_event_control()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"347c4a8747104a945ecced358944e42879176ca5\", \"lessThan\": \"b77600e26fd48727a95ffd50ba1e937efb548125\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"347c4a8747104a945ecced358944e42879176ca5\", \"lessThan\": \"e1ae97624ecf400ea56c238bff23e5cd139df0b8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"347c4a8747104a945ecced358944e42879176ca5\", \"lessThan\": \"35963b31821920908e397146502066f6b032c917\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"347c4a8747104a945ecced358944e42879176ca5\", \"lessThan\": \"f1f7f36cf682fa59db15e2089039a2eeb58ff2ad\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"347c4a8747104a945ecced358944e42879176ca5\", \"lessThan\": \"aad8bbd17a1d586005feb9226c2e9cfce1432e13\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"347c4a8747104a945ecced358944e42879176ca5\", \"lessThan\": \"0ed074317b835caa6c03bcfa8f133365324673dc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"347c4a8747104a945ecced358944e42879176ca5\", \"lessThan\": \"4a7ba45b1a435e7097ca0f79a847d0949d0eb088\", \"versionType\": \"git\"}], \"programFiles\": [\"include/linux/cgroup.h\", \"kernel/cgroup/cgroup-internal.h\", \"mm/memcontrol.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.14\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.14\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.14.302\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.269\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.227\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.159\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.83\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/linux/cgroup.h\", \"kernel/cgroup/cgroup-internal.h\", \"mm/memcontrol.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b77600e26fd48727a95ffd50ba1e937efb548125\"}, {\"url\": \"https://git.kernel.org/stable/c/e1ae97624ecf400ea56c238bff23e5cd139df0b8\"}, {\"url\": \"https://git.kernel.org/stable/c/35963b31821920908e397146502066f6b032c917\"}, {\"url\": \"https://git.kernel.org/stable/c/f1f7f36cf682fa59db15e2089039a2eeb58ff2ad\"}, {\"url\": \"https://git.kernel.org/stable/c/aad8bbd17a1d586005feb9226c2e9cfce1432e13\"}, {\"url\": \"https://git.kernel.org/stable/c/0ed074317b835caa6c03bcfa8f133365324673dc\"}, {\"url\": \"https://git.kernel.org/stable/c/4a7ba45b1a435e7097ca0f79a847d0949d0eb088\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmemcg: fix possible use-after-free in memcg_write_event_control()\\n\\nmemcg_write_event_control() accesses the dentry-\u003ed_name of the specified\\ncontrol fd to route the write call.  As a cgroup interface file can\u0027t be\\nrenamed, it\u0027s safe to access d_name as long as the specified file is a\\nregular cgroup file.  Also, as these cgroup interface files can\u0027t be\\nremoved before the directory, it\u0027s safe to access the parent too.\\n\\nPrior to 347c4a874710 (\\\"memcg: remove cgroup_event-\u003ecft\\\"), there was a\\ncall to __file_cft() which verified that the specified file is a regular\\ncgroupfs file before further accesses.  The cftype pointer returned from\\n__file_cft() was no longer necessary and the commit inadvertently dropped\\nthe file type check with it allowing any file to slip through.  With the\\ninvarients broken, the d_name and parent accesses can now race against\\nrenames and removals of arbitrary files and cause use-after-free\u0027s.\\n\\nFix the bug by resurrecting the file type check in __file_cft().  Now that\\ncgroupfs is implemented through kernfs, checking the file operations needs\\nto go through a layer of indirection.  Instead, let\u0027s check the superblock\\nand dentry type.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:11:59.021Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48988\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:11:59.021Z\", \"dateReserved\": \"2024-08-22T01:27:53.634Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T20:06:04.601Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.