In the Linux kernel, the following vulnerability has been resolved: bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks… (CVE-2026-63865)
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.
AI Analysis
Technical Summary
The Linux kernel vulnerability CVE-2026-63865 involves the BPF subsystem's use of two functions, bpf_lsm_task_to_inode() and bpf_lsm_inet_conn_established(), in Linux Security Module (LSM) hooks that are sleepable. Since bpf_lsm_task_to_inode() is called under rcu_read_lock() and bpf_lsm_inet_conn_established() is called from softirq context, neither function is suitable for sleepable LSM programs. The vulnerability was resolved by removing these functions from sleepable LSM hooks to prevent improper usage.
Potential Impact
The vulnerability could lead to incorrect behavior or instability in the kernel when sleepable LSM programs invoke these hooks, potentially causing system reliability issues. No known exploits in the wild have been reported. The exact impact on security or system compromise is not detailed in the available information.
Mitigation Recommendations
A fix has been implemented in the Linux kernel by dropping the problematic functions from sleepable LSM hooks. No additional mitigation steps are indicated. Users should apply the official Linux kernel updates that include this fix once available. Patch status is not explicitly confirmed in the provided data; check the vendor or Linux kernel advisories for current remediation guidance.
In the Linux kernel, the following vulnerability has been resolved: bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks… (CVE-2026-63865)
Description
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 v3.1
Score 8.8high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel vulnerability CVE-2026-63865 involves the BPF subsystem's use of two functions, bpf_lsm_task_to_inode() and bpf_lsm_inet_conn_established(), in Linux Security Module (LSM) hooks that are sleepable. Since bpf_lsm_task_to_inode() is called under rcu_read_lock() and bpf_lsm_inet_conn_established() is called from softirq context, neither function is suitable for sleepable LSM programs. The vulnerability was resolved by removing these functions from sleepable LSM hooks to prevent improper usage.
Potential Impact
The vulnerability could lead to incorrect behavior or instability in the kernel when sleepable LSM programs invoke these hooks, potentially causing system reliability issues. No known exploits in the wild have been reported. The exact impact on security or system compromise is not detailed in the available information.
Mitigation Recommendations
A fix has been implemented in the Linux kernel by dropping the problematic functions from sleepable LSM hooks. No additional mitigation steps are indicated. Users should apply the official Linux kernel updates that include this fix once available. Patch status is not explicitly confirmed in the provided data; check the vendor or Linux kernel advisories for current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-cx6c-jx3r-hwpq
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-63865"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a5d27ac2a4a8d5989130618
Added to database: 07/19/2026, 19:38:20 UTC
Last enriched: 07/19/2026, 20:14:14 UTC
Last updated: 08/31/2026, 18:21:19 UTC
Views: 85
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.