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CVE-2023-53260 (GCVE-0-2023-53260)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:46 – Updated: 2026-05-11 19:41
VLAI
Title
ovl: fix null pointer dereference in ovl_permission()
Summary
In the Linux kernel, the following vulnerability has been resolved: ovl: fix null pointer dereference in ovl_permission() Following process: P1 P2 path_lookupat link_path_walk inode_permission ovl_permission ovl_i_path_real(inode, &realpath) path->dentry = ovl_i_dentry_upper(inode) drop_cache __dentry_kill(ovl_dentry) iput(ovl_inode) ovl_destroy_inode(ovl_inode) dput(oi->__upperdentry) dentry_kill(upperdentry) dentry_unlink_inode upperdentry->d_inode = NULL realinode = d_inode(realpath.dentry) // return NULL inode_permission(realinode) inode->i_sb // NULL pointer dereference , will trigger an null pointer dereference at realinode: [ 335.664979] BUG: kernel NULL pointer dereference, address: 0000000000000002 [ 335.668032] CPU: 0 PID: 2592 Comm: ls Not tainted 6.3.0 [ 335.669956] RIP: 0010:inode_permission+0x33/0x2c0 [ 335.678939] Call Trace: [ 335.679165] <TASK> [ 335.679371] ovl_permission+0xde/0x320 [ 335.679723] inode_permission+0x15e/0x2c0 [ 335.680090] link_path_walk+0x115/0x550 [ 335.680771] path_lookupat.isra.0+0xb2/0x200 [ 335.681170] filename_lookup+0xda/0x240 [ 335.681922] vfs_statx+0xa6/0x1f0 [ 335.682233] vfs_fstatat+0x7b/0xb0 Fetch a reproducer in [Link]. Use the helper ovl_i_path_realinode() to get realinode and then do non-nullptr checking.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:02 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4b7791b2e95805eaa9568761741d33cf929c930c , < 53dd2ca2c02fdcfe3aad2345091d371063f97d17 (git)
Affected: 4b7791b2e95805eaa9568761741d33cf929c930c , < 69f9ae7edf9ec0ff500429101923347fcba5c8c4 (git)
Affected: 4b7791b2e95805eaa9568761741d33cf929c930c , < 1a73f5b8f079fd42a544c1600beface50c63af7c (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.43 , ≤ 6.1.* (semver)
Unaffected: 6.4.4 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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\"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T18:02:31.571Z\"}}], \"cna\": {\"title\": \"ovl: fix null pointer dereference in ovl_permission()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4b7791b2e95805eaa9568761741d33cf929c930c\", \"lessThan\": \"53dd2ca2c02fdcfe3aad2345091d371063f97d17\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4b7791b2e95805eaa9568761741d33cf929c930c\", \"lessThan\": \"69f9ae7edf9ec0ff500429101923347fcba5c8c4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4b7791b2e95805eaa9568761741d33cf929c930c\", \"lessThan\": \"1a73f5b8f079fd42a544c1600beface50c63af7c\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/overlayfs/inode.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.19\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.19\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.43\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.4.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.4.*\"}, {\"status\": \"unaffected\", \"version\": \"6.5\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/overlayfs/inode.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/53dd2ca2c02fdcfe3aad2345091d371063f97d17\"}, {\"url\": \"https://git.kernel.org/stable/c/69f9ae7edf9ec0ff500429101923347fcba5c8c4\"}, {\"url\": \"https://git.kernel.org/stable/c/1a73f5b8f079fd42a544c1600beface50c63af7c\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\novl: fix null pointer dereference in ovl_permission()\\n\\nFollowing process:\\n          P1                     P2\\n path_lookupat\\n  link_path_walk\\n   inode_permission\\n    ovl_permission\\n      ovl_i_path_real(inode, \u0026realpath)\\n        path-\u003edentry = ovl_i_dentry_upper(inode)\\n                          drop_cache\\n\\t\\t\\t   __dentry_kill(ovl_dentry)\\n\\t\\t            iput(ovl_inode)\\n\\t\\t             ovl_destroy_inode(ovl_inode)\\n\\t\\t              dput(oi-\u003e__upperdentry)\\n\\t\\t               dentry_kill(upperdentry)\\n\\t\\t                dentry_unlink_inode\\n\\t\\t\\t\\t upperdentry-\u003ed_inode = NULL\\n      realinode = d_inode(realpath.dentry) // return NULL\\n      inode_permission(realinode)\\n       inode-\u003ei_sb  // NULL pointer dereference\\n, will trigger an null pointer dereference at realinode:\\n  [  335.664979] BUG: kernel NULL pointer dereference,\\n                 address: 0000000000000002\\n  [  335.668032] CPU: 0 PID: 2592 Comm: ls Not tainted 6.3.0\\n  [  335.669956] RIP: 0010:inode_permission+0x33/0x2c0\\n  [  335.678939] Call Trace:\\n  [  335.679165]  \u003cTASK\u003e\\n  [  335.679371]  ovl_permission+0xde/0x320\\n  [  335.679723]  inode_permission+0x15e/0x2c0\\n  [  335.680090]  link_path_walk+0x115/0x550\\n  [  335.680771]  path_lookupat.isra.0+0xb2/0x200\\n  [  335.681170]  filename_lookup+0xda/0x240\\n  [  335.681922]  vfs_statx+0xa6/0x1f0\\n  [  335.682233]  vfs_fstatat+0x7b/0xb0\\n\\nFetch a reproducer in [Link].\\n\\nUse the helper ovl_i_path_realinode() to get realinode and then do\\nnon-nullptr checking.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.43\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4.4\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5\", \"versionStartIncluding\": \"5.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T19:41:21.024Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-53260\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T19:41:21.024Z\", \"dateReserved\": \"2025-09-15T14:19:21.850Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-15T14:46:31.919Z\", \"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

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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.