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CVE-2026-63865 Linux CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-19T15:16:53.400Z and has not been modified since then. The Linux kernel vulnerability involves a problem with bpf_lsm_task_to_inode() and bpf_lsm_inet_conn_established() functions. These functions are called under rcu_read_lock() and from softirq context, respectively, which restricts their use in sleepable LSM programs. Linux kernel users and administrators should review the vulnerability details and apply patches if available. The vulnerability has a medium priority for Linux kernel users and administrators.

Vendor
Linux
Product
Unknown
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-19
Original CVE updated
2026-07-27
Advisory published
2026-07-19
Advisory updated
2026-07-27

Who should care

Linux kernel users and administrators should review the vulnerability details and apply patches if available. The vulnerability has a medium priority for Linux kernel users and administrators. Linux kernel users should verify the vulnerability details and apply patches if available.

Technical summary

The Linux kernel vulnerability involves a problem with bpf_lsm_task_to_inode() and bpf_lsm_inet_conn_established() functions. These functions are called under rcu_read_lock() and from softirq context, respectively, which restricts their use in sleepable LSM programs. The vulnerability has a medium priority for Linux kernel users and administrators. Linux kernel users should review the vulnerability details and apply patches if available.

Defensive priority

Medium priority for Linux kernel users and administrators.

Recommended defensive actions

  • Review Linux kernel patches and updates
  • Apply patches if available
  • Monitor Linux kernel security advisories
  • Verify Linux kernel deployments in managed environments
  • Review compensating controls for exposed systems
  • Check relevant monitoring, detection, and logs for exposed assets
  • Track exceptions and retest remediated assets

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further investigation and review of Linux kernel patches and updates are necessary. Linux kernel users should verify the vulnerability details and apply patches if available. The vulnerability involves a problem with bpf_lsm_task_to_inode() and bpf_lsm_inet_conn_established() functions. These functions are called under rcu_read_lock() and from softirq context, respectively, which restricts their use in sleepable LSM programs. Evidence limits suggest that additional details may be required for thorough vulnerability assessment.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-63865 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-63865

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-63865 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-63865

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/0d918263c9bfc86078edb2e2f7302a0c6ce42b7c

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/26b380a3ca0b605fd8860995ed6a208f276dd316

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/281f2a214565a5cbf8b7355a65738d80bd19b8c5

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/452a927cddcd67478d030e646f41cb904a93156f

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/989f1b93907de1753a814996222da375f07e579b

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/beaf0e96b1da74549a6cabd040f9667d83b2e97e

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/f0fc2a9828171205244a28013f02889f50b71c9f

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.