Review reviewHigh

CVE-2026-63865

Linux

In the Linux kernel, the following vulnerability has been resolved: bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks bpf_lsm_task_to_inode() is called under rcu_read_lock() and bpf_lsm_inet_conn_established() is called from softirq context, so neither hook can be used by sleepable LSM programs.

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks bpf_lsm_task_to_inode() is called under rcu_read_lock() and bpf_lsm_inet_conn_established() is called from softirq context, so neither hook can be used by sleepable LSM programs.

Affected product and versions

Product
Linux
Affected versions
>= 423f16108c9d832bd96059d5c882c8ef6d76eb96 < 452a927cddcd67478d030e646f41cb904a93156f, >= 423f16108c9d832bd96059d5c882c8ef6d76eb96 < f0fc2a9828171205244a28013f02889f50b71c9f, >= 423f16108c9d832bd96059d5c882c8ef6d76eb96 < 26b380a3ca0b605fd8860995ed6a208f276dd316, >= 423f16108c9d832bd96059d5c882c8ef6d76eb96 < 0d918263c9bfc86078edb2e2f7302a0c6ce42b7c, >= 423f16108c9d832bd96059d5c882c8ef6d76eb96 < 281f2a214565a5cbf8b7355a65738d80bd19b8c5, >= 423f16108c9d832bd96059d5c882c8ef6d76eb96 < 989f1b93907de1753a814996222da375f07e579b, >= 423f16108c9d832bd96059d5c882c8ef6d76eb96 < beaf0e96b1da74549a6cabd040f9667d83b2e97e, >= 5.11
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
Not available
CVE-2026-63865 — Linux | SECUFOCUS NOW