CVE-2023-53260 (GCVE-0-2023-53260)
Vulnerability from cvelistv5
Published
2025-09-15 14:46
Modified
2025-09-15 14:46
Severity ?
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1a73f5b8f079fd42a544c1600beface50c63af7c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53dd2ca2c02fdcfe3aad2345091d371063f97d17
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/69f9ae7edf9ec0ff500429101923347fcba5c8c4
Impacted products
Vendor Product Version
Linux Linux Version: 4b7791b2e95805eaa9568761741d33cf929c930c
Version: 4b7791b2e95805eaa9568761741d33cf929c930c
Version: 4b7791b2e95805eaa9568761741d33cf929c930c
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   Linux Linux Version: 5.19
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/overlayfs/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "53dd2ca2c02fdcfe3aad2345091d371063f97d17",
              "status": "affected",
              "version": "4b7791b2e95805eaa9568761741d33cf929c930c",
              "versionType": "git"
            },
            {
              "lessThan": "69f9ae7edf9ec0ff500429101923347fcba5c8c4",
              "status": "affected",
              "version": "4b7791b2e95805eaa9568761741d33cf929c930c",
              "versionType": "git"
            },
            {
              "lessThan": "1a73f5b8f079fd42a544c1600beface50c63af7c",
              "status": "affected",
              "version": "4b7791b2e95805eaa9568761741d33cf929c930c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/overlayfs/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.43",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.43",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4.4",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.5",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-15T14:46:31.919Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "ovl: fix null pointer dereference in ovl_permission()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53260",
    "datePublished": "2025-09-15T14:46:31.919Z",
    "dateReserved": "2025-09-15T14:19:21.850Z",
    "dateUpdated": "2025-09-15T14:46:31.919Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53260\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-15T15:15:53.430\",\"lastModified\":\"2025-09-15T15:22:27.090\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1a73f5b8f079fd42a544c1600beface50c63af7c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53dd2ca2c02fdcfe3aad2345091d371063f97d17\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/69f9ae7edf9ec0ff500429101923347fcba5c8c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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