CVE-2026-63865 (GCVE-0-2026-63865)
Vulnerability from cvelistv5 – Published: 2026-07-19 14:04 – Updated: 2026-08-05 12:36
VLAI
EPSS
VEX
Title
bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks
Summary
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.
Severity
8.8 (High)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
423f16108c9d832bd96059d5c882c8ef6d76eb96 , < 452a927cddcd67478d030e646f41cb904a93156f
(git)
Affected: 423f16108c9d832bd96059d5c882c8ef6d76eb96 , < f0fc2a9828171205244a28013f02889f50b71c9f (git) Affected: 423f16108c9d832bd96059d5c882c8ef6d76eb96 , < 26b380a3ca0b605fd8860995ed6a208f276dd316 (git) Affected: 423f16108c9d832bd96059d5c882c8ef6d76eb96 , < 0d918263c9bfc86078edb2e2f7302a0c6ce42b7c (git) Affected: 423f16108c9d832bd96059d5c882c8ef6d76eb96 , < 281f2a214565a5cbf8b7355a65738d80bd19b8c5 (git) Affected: 423f16108c9d832bd96059d5c882c8ef6d76eb96 , < 989f1b93907de1753a814996222da375f07e579b (git) Affected: 423f16108c9d832bd96059d5c882c8ef6d76eb96 , < beaf0e96b1da74549a6cabd040f9667d83b2e97e (git) |
guessed | |
| Linux | Linux |
Affected:
5.11
Unaffected: 0 , < 5.11 (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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"containers": {
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"programFiles": [
"kernel/bpf/bpf_lsm.c"
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"versionType": "semver"
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"status": "unaffected",
"version": "5.15.209",
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},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.141",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.91",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.33",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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"versionEndExcluding": "5.15.209",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
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{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
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{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0.10",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1",
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}
],
"negate": false,
"operator": "OR"
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}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks\n\nbpf_lsm_task_to_inode() is called under rcu_read_lock() and\nbpf_lsm_inet_conn_established() is called from softirq context, so\nneither hook can be used by sleepable LSM programs."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires loading and attaching a sleepable BPF LSM program via bpf() syscalls; per kernel CNA guidance BPF subsystem issues are Local even though inet_conn_established fires during TCP receive processing.\nAC:L - Once a sleepable BPF LSM program is attached, the attacker reliably triggers the bug by making outbound TCP connections (inet_conn_established in softirq) or accessing /proc entries (task_to_inode under rcu_read_lock) without race-dependent conditions.\nPR:L - Loading BPF_PROG_TYPE_LSM programs requires CAP_BPF and CAP_PERFMON, both obtainable by an unprivileged user inside a user namespace (unshare -Ur) on typical Linux deployments with CONFIG_BPF_LSM enabled.\nUI:N - No victim user interaction is required; triggering occurs automatically from normal outbound TCP handshakes or /proc filesystem access after the sleepable BPF program is loaded.\nS:C - A container tenant with namespace CAP_BPF can load a sleepable BPF LSM on inet_conn_established or task_to_inode, and hook execution in host kernel softirq/RCU context can crash or corrupt the entire host, crossing the container-to-host security boundary.\nC:H - Executing sleepable BPF helpers (e.g. bpf_copy_from_user, GFP_KERNEL allocations) inside rcu_read_lock or softirq can corrupt kernel memory before detection, and such context violations are classifiable as exploitable memory-safety failures.\nI:H - Sleeping while holding TCP stack or RCU-protected locks can corrupt kernel data structures and potentially be leveraged for arbitrary kernel write or control-flow hijack, not merely a clean crash.\nA:H - Invoking might_sleep operations from softirq or RCU-critical sections reliably causes kernel BUG/oops/panic (\"sleeping function called from invalid context\"), producing complete host denial of service."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:36:41.333Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
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"url": "https://git.kernel.org/stable/c/452a927cddcd67478d030e646f41cb904a93156f"
},
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"url": "https://git.kernel.org/stable/c/f0fc2a9828171205244a28013f02889f50b71c9f"
},
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"url": "https://git.kernel.org/stable/c/26b380a3ca0b605fd8860995ed6a208f276dd316"
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"url": "https://git.kernel.org/stable/c/0d918263c9bfc86078edb2e2f7302a0c6ce42b7c"
},
{
"url": "https://git.kernel.org/stable/c/281f2a214565a5cbf8b7355a65738d80bd19b8c5"
},
{
"url": "https://git.kernel.org/stable/c/989f1b93907de1753a814996222da375f07e579b"
},
{
"url": "https://git.kernel.org/stable/c/beaf0e96b1da74549a6cabd040f9667d83b2e97e"
}
],
"title": "bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks",
"x_generator": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-63865",
"datePublished": "2026-07-19T14:04:51.215Z",
"dateReserved": "2026-07-19T07:54:57.017Z",
"dateUpdated": "2026-08-05T12:36:41.333Z",
"state": "PUBLISHED"
},
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"date": "2026-09-29",
"epss": "0.00127",
"percentile": "0.02035"
},
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"cve": {
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"product": "Linux",
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"versions": [
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{
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"version": "6.12.91",
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},
{
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"version": "7.0.10",
"versionType": "semver"
},
{
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"versionType": "original_commit_for_fix"
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks\n\nbpf_lsm_task_to_inode() is called under rcu_read_lock() and\nbpf_lsm_inet_conn_established() is called from softirq context, so\nneither hook can be used by sleepable LSM programs."
}
],
"id": "CVE-2026-63865",
"lastModified": "2026-07-27T17:44:23.777",
"metrics": {
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{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
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"impactScore": 6.0,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
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"published": "2026-07-19T15:16:53.400",
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}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-21T19:20:46+00:00",
"cve": "CVE-2026-63865",
"id": "CVE-2026-63865",
"initial_release_date": "2026-07-19T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63865.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-18T00:47:14Z",
"cve": "CVE-2026-63865",
"id": "CVE-2026-63865",
"initial_release_date": "2026-07-24T16:21:42Z",
"product_status:known_affected": "423",
"product_status:known_not_affected": "310",
"product_status:recommended": "107",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-63865",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63865.json",
"version": "9"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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