CVE-2026-64192 (GCVE-0-2026-64192)
Vulnerability from cvelistv5
Published
2026-07-20 16:27
Modified
2026-08-23 12:45
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized When CONFIG_BPF_LSM=y is set, BPF inode storage maps (BPF_MAP_TYPE_INODE_STORAGE) are compiled into the kernel. However, if the BPF LSM is not explicitly enabled at boot time (e.g. omitted from the "lsm=" boot parameter), lsm_prepare() is never executed for the BPF LSM. Consequently, the BPF inode security blob offset (bpf_lsm_blob_sizes.lbs_inode) is never initialized and remains at its default compiled size of 8 bytes instead of being updated to a valid offset past the reserved struct rcu_head (typically 16 bytes or more). When a privileged user creates and updates a BPF_MAP_TYPE_INODE_STORAGE map, bpf_inode() evaluates inode->i_security + 8. This erroneously aliases the struct rcu_head.func callback pointer at the beginning of the inode->i_security blob. During subsequent map element cleanup or inode destruction, writing NULL to owner_storage clears the queued RCU callback pointer. When rcu_do_batch() later executes the queued callback, it attempts an instruction fetch at address 0x0, triggering an immediate kernel panic. Fix this by introducing a global bpf_lsm_initialized boolean flag marked with __ro_after_init. Set this flag to true inside bpf_lsm_init() when the LSM framework successfully registers the BPF LSM. Gate map allocation in inode_storage_map_alloc() on this flag, returning -EOPNOTSUPP if the BPF LSM is in turn uninitialized. This fail-fast approach prevents userspace from allocating inode storage maps when the supporting BPF LSM infrastructure is absent, avoiding zombie map states.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6
Version: 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6
Version: 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6
Version: 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6
Version: 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6
Version: 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6
Version: 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6
Version: 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/bpf_lsm.h",
            "kernel/bpf/bpf_inode_storage.c",
            "security/bpf/hooks.c"
          ],
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "5.10"
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              "version": "0",
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              "version": "5.15.217",
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized\n\nWhen CONFIG_BPF_LSM=y is set, BPF inode storage maps\n(BPF_MAP_TYPE_INODE_STORAGE) are compiled into the kernel. However,\nif the BPF LSM is not explicitly enabled at boot time (e.g. omitted\nfrom the \"lsm=\" boot parameter), lsm_prepare() is never executed for\nthe BPF LSM.\n\nConsequently, the BPF inode security blob offset\n(bpf_lsm_blob_sizes.lbs_inode) is never initialized and remains at\nits default compiled size of 8 bytes instead of being updated to a\nvalid offset past the reserved struct rcu_head (typically 16 bytes\nor more).\n\nWhen a privileged user creates and updates a BPF_MAP_TYPE_INODE_STORAGE\nmap, bpf_inode() evaluates inode-\u003ei_security + 8. This erroneously\naliases the struct rcu_head.func callback pointer at the beginning\nof the inode-\u003ei_security blob. During subsequent map element cleanup\nor inode destruction, writing NULL to owner_storage clears the queued\nRCU callback pointer. When rcu_do_batch() later executes the queued\ncallback, it attempts an instruction fetch at address 0x0, triggering\nan immediate kernel panic.\n\nFix this by introducing a global bpf_lsm_initialized boolean flag\nmarked with __ro_after_init. Set this flag to true inside bpf_lsm_init()\nwhen the LSM framework successfully registers the BPF LSM. Gate map\nallocation in inode_storage_map_alloc() on this flag, returning\n-EOPNOTSUPP if the BPF LSM is in turn uninitialized.\n\nThis fail-fast approach prevents userspace from allocating inode\nstorage maps when the supporting BPF LSM infrastructure is absent,\navoiding zombie map states."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:45:34.754Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/413b14b9623a2e6ee131c2b2152b304aeb04e378"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6d634f794c808a261eac7d5af023a7e06b9ecd8"
        },
        {
          "url": "https://git.kernel.org/stable/c/721f669853bdbf46b475a81bb5d05d610f8c19de"
        },
        {
          "url": "https://git.kernel.org/stable/c/5337eebdf8c5d4810b1913047f078d2815d5645f"
        },
        {
          "url": "https://git.kernel.org/stable/c/de984ea883405420fdc416ae8964b752df586970"
        },
        {
          "url": "https://git.kernel.org/stable/c/267fdd9b6530c399dfd996e1a0a7628b45baf9f0"
        },
        {
          "url": "https://git.kernel.org/stable/c/c76b8abce575e0c6e4096957220b4515ed847d89"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6f0643e4f63cfaa0d5d4a69de4f132eac4b8fe4"
        }
      ],
      "title": "bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64192",
    "datePublished": "2026-07-20T16:27:51.720Z",
    "dateReserved": "2026-07-19T07:54:57.040Z",
    "dateUpdated": "2026-08-23T12:45:34.754Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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