CVE-2026-64192 (GCVE-0-2026-64192)

Vulnerability from cvelistv5 – Published: 2026-07-20 16:27 – Updated: 2026-08-03 09:32
VLAI
Title
bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized
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.
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
Linux Linux Affected: 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6 , < 5337eebdf8c5d4810b1913047f078d2815d5645f (git)
Affected: 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6 , < de984ea883405420fdc416ae8964b752df586970 (git)
Affected: 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6 , < 267fdd9b6530c399dfd996e1a0a7628b45baf9f0 (git)
Affected: 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6 , < c76b8abce575e0c6e4096957220b4515ed847d89 (git)
Affected: 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6 , < a6f0643e4f63cfaa0d5d4a69de4f132eac4b8fe4 (git)
Create a notification for this product.
Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc2 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "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."
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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 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    "redhat_vex": {
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      "cve": "CVE-2026-64192",
      "id": "CVE-2026-64192",
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      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64192.json",
      "version": "3"
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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-21T12:58:01Z",
      "cve": "CVE-2026-64192",
      "id": "CVE-2026-64192",
      "initial_release_date": "2026-07-21T12:58:01Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64192",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64192.json",
      "version": "2"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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