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CVE-2026-64192— bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 5.10版本存在安全漏洞，该漏洞源于BPF LSM未初始化时未拒绝BPF_MAP_TYPE_INODE_STORAGE创建，可能导致特权用户通过操作inode存储映射触发内核崩溃。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.12% · P2

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6< 413b14b9623a2e6ee131c2b2152b304aeb04e378 affected
8ea636848aca35b9f97c5b5dee30225cf2dd0fe6< a6d634f794c808a261eac7d5af023a7e06b9ecd8 affected
8ea636848aca35b9f97c5b5dee30225cf2dd0fe6< 721f669853bdbf46b475a81bb5d05d610f8c19de affected
8ea636848aca35b9f97c5b5dee30225cf2dd0fe6< 5337eebdf8c5d4810b1913047f078d2815d5645f affected
8ea636848aca35b9f97c5b5dee30225cf2dd0fe6< de984ea883405420fdc416ae8964b752df586970 affected
8ea636848aca35b9f97c5b5dee30225cf2dd0fe6< 267fdd9b6530c399dfd996e1a0a7628b45baf9f0 affected
8ea636848aca35b9f97c5b5dee30225cf2dd0fe6< c76b8abce575e0c6e4096957220b4515ed847d89 affected
8ea636848aca35b9f97c5b5dee30225cf2dd0fe6< a6f0643e4f63cfaa0d5d4a69de4f132eac4b8fe4 affected
… +10 more rows
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I. Basic Information for CVE-2026-64192

Vulnerability Information
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Vulnerability Title
bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 5.10版本存在安全漏洞，该漏洞源于BPF LSM未初始化时未拒绝BPF_MAP_TYPE_INODE_STORAGE创建，可能导致特权用户通过操作inode存储映射触发内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8ea636848aca35b9f97c5b5dee30225cf2dd0fe6 ~ 413b14b9623a2e6ee131c2b2152b304aeb04e378 -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-64192

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III. Intelligence Information for CVE-2026-64192

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Patches & Fixes for CVE-2026-64192 (7)

Same Patch Batch · Linux · 2026-07-20 · 9 CVEs total

CVE-2026-64206 8.8 HIGH Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock
CVE-2026-64188 7.8 HIGH net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()
CVE-2026-64189 7.8 HIGH netfilter: ipset: fix race between dump and ip_set_list resize
CVE-2026-64191 7.8 HIGH i2c: stub: Reject I2C block transfers with invalid length
CVE-2026-64187 xfs: fail recovery on a committed log item with no regions
CVE-2026-64190 net: team: fix NULL pointer dereference in team_xmit during mode change
CVE-2026-64205 i2c: i801: fix hardware state machine corruption in error path
CVE-2026-64207 net/sched: dualpi2: fix GSO backlog accounting

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64192

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