CVE-2026-63865 — bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks
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.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.1% (30-day exploitation probability)+0
- Technical severity (high)+6
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Search available logs for exploit probes, errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Linux | Linux | ≥ 423f16108c9d832bd96059d5c882c8ef6d76eb96 and < 452a927cddcd67478d030e646f41cb904a93156f≥ 423f16108c9d832bd96059d5c882c8ef6d76eb96 and < f0fc2a9828171205244a28013f02889f50b71c9f≥ 423f16108c9d832bd96059d5c882c8ef6d76eb96 and < 26b380a3ca0b605fd8860995ed6a208f276dd316≥ 423f16108c9d832bd96059d5c882c8ef6d76eb96 and < 0d918263c9bfc86078edb2e2f7302a0c6ce42b7c≥ 423f16108c9d832bd96059d5c882c8ef6d76eb96 and < 281f2a214565a5cbf8b7355a65738d80bd19b8c5≥ 423f16108c9d832bd96059d5c882c8ef6d76eb96 and < 989f1b93907de1753a814996222da375f07e579b≥ 423f16108c9d832bd96059d5c882c8ef6d76eb96 and < beaf0e96b1da74549a6cabd040f9667d83b2e97eversion 5.11 | Vulnerable | CVE Program (cve.org) e CISA ADP |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 8.8 | CVSS 3.1 | High | 2.0 | 6.0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database |
| 8.8 | CVSS 3.1 | High | — | — | Linux via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H (score shown at the top: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · linux/linux
- Record published
- CVSS changed · 8.8
- Source status changed · → Awaiting Analysis
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 15, 2026 – Oct 15, 2026
References
7 on the record
- git.kernel.org/stable/c/989f1b93907de1753a814996222da375f07e579b
- git.kernel.org/stable/c/beaf0e96b1da74549a6cabd040f9667d83b2e97e
- git.kernel.org/stable/c/26b380a3ca0b605fd8860995ed6a208f276dd316
- git.kernel.org/stable/c/f0fc2a9828171205244a28013f02889f50b71c9f
- git.kernel.org/stable/c/452a927cddcd67478d030e646f41cb904a93156f
- git.kernel.org/stable/c/0d918263c9bfc86078edb2e2f7302a0c6ce42b7c
- git.kernel.org/stable/c/281f2a214565a5cbf8b7355a65738d80bd19b8c5
Elsewhere on this site
Related CVEs (same products)
- Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 23h
- Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 23h
- Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
- Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
- Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
- Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No fixed version, patch or mitigation documented.
- No CISA SSVC assessment.
- No CWE classification.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-63865 is "bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks", rated High. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 8.8 describes technical severity. EPSS 0.13% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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