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CVE-2022-49688 (GCVE-0-2022-49688)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:24 – Updated: 2026-05-23 15:22
VLAI
Title
afs: Fix dynamic root getattr
Summary
In the Linux kernel, the following vulnerability has been resolved: afs: Fix dynamic root getattr The recent patch to make afs_getattr consult the server didn't account for the pseudo-inodes employed by the dynamic root-type afs superblock not having a volume or a server to access, and thus an oops occurs if such a directory is stat'd. Fix this by checking to see if the vnode->volume pointer actually points anywhere before following it in afs_getattr(). This can be tested by stat'ing a directory in /afs. It may be sufficient just to do "ls /afs" and the oops looks something like: BUG: kernel NULL pointer dereference, address: 0000000000000020 ... RIP: 0010:afs_getattr+0x8b/0x14b ... Call Trace: <TASK> vfs_statx+0x79/0xf5 vfs_fstatat+0x49/0x62
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b76ea7c06b24dcf97ea3379b6957d5b99c346ea0 , < 65c24caf1b9f5b08397c6e805ec24ebc390c6e4d (git)
Affected: dba1941f5bc3de6b460685155b89ae1182824fc8 , < e3a232e5767051483ffad4cef7d0a89d292a192b (git)
Affected: 61a4cc41e5c1b77d05a12798f8032050aa75f3c8 , < 7b564e3254b7db5fbfbf11a824627a6c31b932b4 (git)
Affected: 94bf8bfb009fad247d02f12e4c443411c8445412 , < 2b2bba96526f25f2eba74ecadb031de2e05a83ce (git)
Affected: 2aeb8c86d49967552394d5e723f87454cb53f501 , < 7844ceada44eca740d31beb3d97b8511b1ca0a9b (git)
Affected: 2aeb8c86d49967552394d5e723f87454cb53f501 , < cb78d1b5efffe4cf97e16766329dd7358aed3deb (git)
Affected: 9e655a8b874d7c56e02938ddb221b16e293793df (git)
Affected: 4.19.245 , < 4.19.250 (semver)
Affected: 5.4.196 , < 5.4.202 (semver)
Affected: 5.10.118 , < 5.10.127 (semver)
Affected: 5.15.42 , < 5.15.51 (semver)
Affected: 5.17.10 , < 5.18 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 4.19.250 , ≤ 4.19.* (semver)
Unaffected: 5.4.202 , ≤ 5.4.* (semver)
Unaffected: 5.10.127 , ≤ 5.10.* (semver)
Unaffected: 5.15.51 , ≤ 5.15.* (semver)
Unaffected: 5.18.8 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix dynamic root getattr\n\nThe recent patch to make afs_getattr consult the server didn\u0027t account\nfor the pseudo-inodes employed by the dynamic root-type afs superblock\nnot having a volume or a server to access, and thus an oops occurs if\nsuch a directory is stat\u0027d.\n\nFix this by checking to see if the vnode-\u003evolume pointer actually points\nanywhere before following it in afs_getattr().\n\nThis can be tested by stat\u0027ing a directory in /afs.  It may be\nsufficient just to do \"ls /afs\" and the oops looks something like:\n\n        BUG: kernel NULL pointer dereference, address: 0000000000000020\n        ...\n        RIP: 0010:afs_getattr+0x8b/0x14b\n        ...\n        Call Trace:\n         \u003cTASK\u003e\n         vfs_statx+0x79/0xf5\n         vfs_fstatat+0x49/0x62"
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It may be\\nsufficient just to do \\\"ls /afs\\\" and the oops looks something like:\\n\\n        BUG: kernel NULL pointer dereference, address: 0000000000000020\\n        ...\\n        RIP: 0010:afs_getattr+0x8b/0x14b\\n        ...\\n        Call Trace:\\n         \u003cTASK\u003e\\n         vfs_statx+0x79/0xf5\\n         vfs_fstatat+0x49/0x62\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: afs: Fix dynamic root getattr El parche reciente para hacer que afs_getattr consulte al servidor no tuvo en cuenta los pseudoinodos empleados por el superbloque afs de tipo ra\u00edz din\u00e1mico que no tienen un volumen o un servidor al que acceder, y por lo tanto ocurre un error si se agrega una estad\u00edstica a dicho directorio. Arregle esto verificando si el puntero vnode-\u0026gt;volume realmente apunta a alg\u00fan lugar antes de seguirlo en afs_getattr(). Esto se puede probar agregando una estad\u00edstica a un directorio en /afs. Puede ser suficiente con hacer \\\"ls /afs\\\" y el error se ver\u00e1 as\u00ed: ERROR: desreferencia de puntero NULL del n\u00facleo, direcci\u00f3n: 0000000000000020 ... RIP: 0010:afs_getattr+0x8b/0x14b ... 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:38:48+00:00",
      "cve": "CVE-2022-49688",
      "id": "CVE-2022-49688",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "201",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "166",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: afs: Fix dynamic root getattr",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49688.json",
      "version": "3"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.