CVE-2025-40271 (GCVE-0-2025-40271)

Vulnerability from cvelistv5 – Published: 2025-12-06 21:50 – Updated: 2026-06-16 19:37
VLAI
Title
fs/proc: fix uaf in proc_readdir_de()
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/proc: fix uaf in proc_readdir_de() Pde is erased from subdir rbtree through rb_erase(), but not set the node to EMPTY, which may result in uaf access. We should use RB_CLEAR_NODE() set the erased node to EMPTY, then pde_subdir_next() will return NULL to avoid uaf access. We found an uaf issue while using stress-ng testing, need to run testcase getdent and tun in the same time. The steps of the issue is as follows: 1) use getdent to traverse dir /proc/pid/net/dev_snmp6/, and current pde is tun3; 2) in the [time windows] unregister netdevice tun3 and tun2, and erase them from rbtree. erase tun3 first, and then erase tun2. the pde(tun2) will be released to slab; 3) continue to getdent process, then pde_subdir_next() will return pde(tun2) which is released, it will case uaf access. CPU 0 | CPU 1 ------------------------------------------------------------------------- traverse dir /proc/pid/net/dev_snmp6/ | unregister_netdevice(tun->dev) //tun3 tun2 sys_getdents64() | iterate_dir() | proc_readdir() | proc_readdir_de() | snmp6_unregister_dev() pde_get(de); | proc_remove() read_unlock(&proc_subdir_lock); | remove_proc_subtree() | write_lock(&proc_subdir_lock); [time window] | rb_erase(&root->subdir_node, &parent->subdir); | write_unlock(&proc_subdir_lock); read_lock(&proc_subdir_lock); | next = pde_subdir_next(de); | pde_put(de); | de = next; //UAF | rbtree of dev_snmp6 | pde(tun3) / \ NULL pde(tun2)
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 710585d4922fd315f2cada8fbe550ae8ed23e994 , < 1d1596d68a6f11d28f677eedf6cf5b17dbfeb491 (git)
Affected: 710585d4922fd315f2cada8fbe550ae8ed23e994 , < c81d0385500446efe48c305bbb83d47f2ae23a50 (git)
Affected: 710585d4922fd315f2cada8fbe550ae8ed23e994 , < 4cba73c4c89219beef7685a47374bf88b1022369 (git)
Affected: 710585d4922fd315f2cada8fbe550ae8ed23e994 , < 6f2482745e510ae1dacc9b090194b9c5f918d774 (git)
Affected: 710585d4922fd315f2cada8fbe550ae8ed23e994 , < 67272c11f379d9aa5e0f6b16286b9d89b3f76046 (git)
Affected: 710585d4922fd315f2cada8fbe550ae8ed23e994 , < 623bb26127fb581a741e880e1e1a47d79aecb6f8 (git)
Affected: 710585d4922fd315f2cada8fbe550ae8ed23e994 , < 03de7ff197a3d0e17d0d5c58fdac99a63cba8110 (git)
Affected: 710585d4922fd315f2cada8fbe550ae8ed23e994 , < 895b4c0c79b092d732544011c3cecaf7322c36a1 (git)
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Linux Linux Affected: 3.19
Unaffected: 0 , < 3.19 (semver)
Unaffected: 5.4.302 , ≤ 5.4.* (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.59 , ≤ 6.12.* (semver)
Unaffected: 6.17.9 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Siemens RUGGEDCOM RST2428P Affected: 0 , < V4.0 (custom)
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The steps of the issue is as follows:\\n\\n1) use getdent to traverse dir /proc/pid/net/dev_snmp6/, and current\\n   pde is tun3;\\n\\n2) in the [time windows] unregister netdevice tun3 and tun2, and erase\\n   them from rbtree.  erase tun3 first, and then erase tun2.  the\\n   pde(tun2) will be released to slab;\\n\\n3) continue to getdent process, then pde_subdir_next() will return\\n   pde(tun2) which is released, it will case uaf access.\\n\\nCPU 0                                      |    CPU 1\\n-------------------------------------------------------------------------\\ntraverse dir /proc/pid/net/dev_snmp6/      |   unregister_netdevice(tun-\u003edev)   //tun3 tun2\\nsys_getdents64()                           |\\n  iterate_dir()                            |\\n    proc_readdir()                         |\\n      proc_readdir_de()                    |     snmp6_unregister_dev()\\n        pde_get(de);                       |       proc_remove()\\n        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Coordinator\",\"version\":\"2.0.3\"}}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/03de7ff197a3d0e17d0d5c58fdac99a63cba8110\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1d1596d68a6f11d28f677eedf6cf5b17dbfeb491\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4cba73c4c89219beef7685a47374bf88b1022369\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/623bb26127fb581a741e880e1e1a47d79aecb6f8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/67272c11f379d9aa5e0f6b16286b9d89b3f76046\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6f2482745e510ae1dacc9b090194b9c5f918d774\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/895b4c0c79b092d732544011c3cecaf7322c36a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c81d0385500446efe48c305bbb83d47f2ae23a50\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-253495.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T10:22:43+00:00",
      "cve": "CVE-2025-40271",
      "id": "CVE-2025-40271",
      "initial_release_date": "2025-12-06T00:00:00+00:00",
      "product_status:fixed": "2410",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "20",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Use-after-free in proc_readdir_de() can lead to privilege escalation or denial of service.",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40271.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:55:48Z",
      "cve": "CVE-2025-40271",
      "id": "CVE-2025-40271",
      "initial_release_date": "2025-12-08T00:23:21Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "671",
      "product_status:known_not_affected": "53",
      "product_status:recommended": "426",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40271",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40271.json",
      "version": "47"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"affected\": [{\"vendor\": \"Siemens\", \"product\": \"RUGGEDCOM RST2428P\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"V4.0\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-253495.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-06-02T13:00:17.378Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-40271\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-16T19:37:49.226666Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-16T19:37:56.227Z\"}}], \"cna\": {\"title\": \"fs/proc: fix uaf in proc_readdir_de()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"710585d4922fd315f2cada8fbe550ae8ed23e994\", \"lessThan\": \"1d1596d68a6f11d28f677eedf6cf5b17dbfeb491\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"710585d4922fd315f2cada8fbe550ae8ed23e994\", \"lessThan\": \"c81d0385500446efe48c305bbb83d47f2ae23a50\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"710585d4922fd315f2cada8fbe550ae8ed23e994\", \"lessThan\": \"4cba73c4c89219beef7685a47374bf88b1022369\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"710585d4922fd315f2cada8fbe550ae8ed23e994\", \"lessThan\": \"6f2482745e510ae1dacc9b090194b9c5f918d774\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"710585d4922fd315f2cada8fbe550ae8ed23e994\", \"lessThan\": \"67272c11f379d9aa5e0f6b16286b9d89b3f76046\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"710585d4922fd315f2cada8fbe550ae8ed23e994\", \"lessThan\": \"623bb26127fb581a741e880e1e1a47d79aecb6f8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"710585d4922fd315f2cada8fbe550ae8ed23e994\", \"lessThan\": \"03de7ff197a3d0e17d0d5c58fdac99a63cba8110\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"710585d4922fd315f2cada8fbe550ae8ed23e994\", \"lessThan\": \"895b4c0c79b092d732544011c3cecaf7322c36a1\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/proc/generic.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.19\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.19\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.302\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.247\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.197\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.159\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.117\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.59\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.17.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.17.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/proc/generic.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1d1596d68a6f11d28f677eedf6cf5b17dbfeb491\"}, {\"url\": \"https://git.kernel.org/stable/c/c81d0385500446efe48c305bbb83d47f2ae23a50\"}, {\"url\": \"https://git.kernel.org/stable/c/4cba73c4c89219beef7685a47374bf88b1022369\"}, {\"url\": \"https://git.kernel.org/stable/c/6f2482745e510ae1dacc9b090194b9c5f918d774\"}, {\"url\": \"https://git.kernel.org/stable/c/67272c11f379d9aa5e0f6b16286b9d89b3f76046\"}, {\"url\": \"https://git.kernel.org/stable/c/623bb26127fb581a741e880e1e1a47d79aecb6f8\"}, {\"url\": \"https://git.kernel.org/stable/c/03de7ff197a3d0e17d0d5c58fdac99a63cba8110\"}, {\"url\": \"https://git.kernel.org/stable/c/895b4c0c79b092d732544011c3cecaf7322c36a1\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs/proc: fix uaf in proc_readdir_de()\\n\\nPde is erased from subdir rbtree through rb_erase(), but not set the node\\nto EMPTY, which may result in uaf access.  We should use RB_CLEAR_NODE()\\nset the erased node to EMPTY, then pde_subdir_next() will return NULL to\\navoid uaf access.\\n\\nWe found an uaf issue while using stress-ng testing, need to run testcase\\ngetdent and tun in the same time.  The steps of the issue is as follows:\\n\\n1) use getdent to traverse dir /proc/pid/net/dev_snmp6/, and current\\n   pde is tun3;\\n\\n2) in the [time windows] unregister netdevice tun3 and tun2, and erase\\n   them from rbtree.  erase tun3 first, and then erase tun2.  the\\n   pde(tun2) will be released to slab;\\n\\n3) continue to getdent process, then pde_subdir_next() will return\\n   pde(tun2) which is released, it will case uaf access.\\n\\nCPU 0                                      |    CPU 1\\n-------------------------------------------------------------------------\\ntraverse dir /proc/pid/net/dev_snmp6/      |   unregister_netdevice(tun-\u003edev)   //tun3 tun2\\nsys_getdents64()                           |\\n  iterate_dir()                            |\\n    proc_readdir()                         |\\n      proc_readdir_de()                    |     snmp6_unregister_dev()\\n        pde_get(de);                       |       proc_remove()\\n        read_unlock(\u0026proc_subdir_lock);    |         remove_proc_subtree()\\n                                           |           write_lock(\u0026proc_subdir_lock);\\n        [time window]                      |           rb_erase(\u0026root-\u003esubdir_node, \u0026parent-\u003esubdir);\\n                                           |           write_unlock(\u0026proc_subdir_lock);\\n        read_lock(\u0026proc_subdir_lock);      |\\n        next = pde_subdir_next(de);        |\\n        pde_put(de);                       |\\n        de = next;    //UAF                |\\n\\nrbtree of dev_snmp6\\n                        |\\n                    pde(tun3)\\n                     /    \\\\\\n                  NULL  pde(tun2)\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.302\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.247\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.197\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.159\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.117\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.59\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17.9\", \"versionStartIncluding\": \"3.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18\", \"versionStartIncluding\": \"3.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:46:07.444Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-40271\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-16T19:37:59.970Z\", \"dateReserved\": \"2025-04-16T07:20:57.183Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-12-06T21:50:53.266Z\", \"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.