CVE-2026-93173 (GCVE-0-2026-93173)
Vulnerability from cvelistv5 – Published: 2026-09-17 16:12 – Updated: 2026-09-17 16:12
VLAI
EPSS
VEX
Title
bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks
__bpf_prog_put_rcu() is the call_rcu() callback for non-sleepable programs.
security_bpf_prog_free() called from there fires bpf_prog_free in softirq;
if a sleepable LSM prog is attached to that hook, might_fault() BUGs:
BUG: sleeping function called from invalid context
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5038
preempt_count: 101, expected: 0
Call Trace:
<IRQ>
__bpf_prog_enter_sleepable+0x1cd/0x320 kernel/bpf/trampoline.c:1255
bpf_trampoline_6442549705+0x53/0xd7
security_bpf_prog_free+0xde/0x130 security/security.c:5465
__bpf_prog_put_rcu+0xab/0xd0 kernel/bpf/syscall.c:2365
rcu_do_batch kernel/rcu/tree.c:2617 [inline]
handle_softirqs+0x236/0x800 kernel/softirq.c:622
</IRQ>
The call_rcu/call_rcu_tasks_trace split reflects the freed program's
sleepability, not that of any attached observer.
security_bpf_prog_free() also frees prog->aux->security, which has to stay
after the grace period, so drop bpf_prog_free from sleepable_lsm_hooks
rather than move the call. Non-sleepable observers still run there.
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1b67772e4e3f16cd647b229cae95fc06d120be08 , < 2135f661fae7160a7fc603cab43cbc7999e8bfce
(git)
Affected: 1b67772e4e3f16cd647b229cae95fc06d120be08 , < d5f2f741a900123fbcb7c7c0a002b81306fbe242 (git) Affected: 1b67772e4e3f16cd647b229cae95fc06d120be08 , < 915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62 (git) Affected: 1b67772e4e3f16cd647b229cae95fc06d120be08 , < 2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8 (git) |
guessed | |
| Linux | Linux |
Affected:
6.9
Unaffected: 0 , < 6.9 (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/bpf/bpf_lsm.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "2135f661fae7160a7fc603cab43cbc7999e8bfce",
"status": "affected",
"version": "1b67772e4e3f16cd647b229cae95fc06d120be08",
"versionType": "git"
},
{
"lessThan": "d5f2f741a900123fbcb7c7c0a002b81306fbe242",
"status": "affected",
"version": "1b67772e4e3f16cd647b229cae95fc06d120be08",
"versionType": "git"
},
{
"lessThan": "915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62",
"status": "affected",
"version": "1b67772e4e3f16cd647b229cae95fc06d120be08",
"versionType": "git"
},
{
"lessThan": "2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8",
"status": "affected",
"version": "1b67772e4e3f16cd647b229cae95fc06d120be08",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"kernel/bpf/bpf_lsm.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"lessThan": "6.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.110",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.52",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.6",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3-rc1",
"versionStartIncluding": "6.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks\n\n__bpf_prog_put_rcu() is the call_rcu() callback for non-sleepable programs.\nsecurity_bpf_prog_free() called from there fires bpf_prog_free in softirq;\nif a sleepable LSM prog is attached to that hook, might_fault() BUGs:\n\n BUG: sleeping function called from invalid context\n in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5038\n preempt_count: 101, expected: 0\n Call Trace:\n \u003cIRQ\u003e\n __bpf_prog_enter_sleepable+0x1cd/0x320 kernel/bpf/trampoline.c:1255\n bpf_trampoline_6442549705+0x53/0xd7\n security_bpf_prog_free+0xde/0x130 security/security.c:5465\n __bpf_prog_put_rcu+0xab/0xd0 kernel/bpf/syscall.c:2365\n rcu_do_batch kernel/rcu/tree.c:2617 [inline]\n handle_softirqs+0x236/0x800 kernel/softirq.c:622\n \u003c/IRQ\u003e\n\nThe call_rcu/call_rcu_tasks_trace split reflects the freed program\u0027s\nsleepability, not that of any attached observer.\n\nsecurity_bpf_prog_free() also frees prog-\u003eaux-\u003esecurity, which has to stay\nafter the grace period, so drop bpf_prog_free from sleepable_lsm_hooks\nrather than move the call. Non-sleepable observers still run there."
}
],
"providerMetadata": {
"dateUpdated": "2026-09-17T16:12:03.229Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/2135f661fae7160a7fc603cab43cbc7999e8bfce"
},
{
"url": "https://git.kernel.org/stable/c/d5f2f741a900123fbcb7c7c0a002b81306fbe242"
},
{
"url": "https://git.kernel.org/stable/c/915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62"
},
{
"url": "https://git.kernel.org/stable/c/2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8"
}
],
"title": "bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-93173",
"datePublished": "2026-09-17T16:12:03.229Z",
"dateReserved": "2026-09-17T16:02:15.090Z",
"dateUpdated": "2026-09-17T16:12:03.229Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-93173\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-17T17:18:13.057\",\"lastModified\":\"2026-09-17T17:18:13.057\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks\\n\\n__bpf_prog_put_rcu() is the call_rcu() callback for non-sleepable programs.\\nsecurity_bpf_prog_free() called from there fires bpf_prog_free in softirq;\\nif a sleepable LSM prog is attached to that hook, might_fault() BUGs:\\n\\n BUG: sleeping function called from invalid context\\n in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5038\\n preempt_count: 101, expected: 0\\n Call Trace:\\n \u003cIRQ\u003e\\n __bpf_prog_enter_sleepable+0x1cd/0x320 kernel/bpf/trampoline.c:1255\\n bpf_trampoline_6442549705+0x53/0xd7\\n security_bpf_prog_free+0xde/0x130 security/security.c:5465\\n __bpf_prog_put_rcu+0xab/0xd0 kernel/bpf/syscall.c:2365\\n rcu_do_batch kernel/rcu/tree.c:2617 [inline]\\n handle_softirqs+0x236/0x800 kernel/softirq.c:622\\n \u003c/IRQ\u003e\\n\\nThe call_rcu/call_rcu_tasks_trace split reflects the freed program\u0027s\\nsleepability, not that of any attached observer.\\n\\nsecurity_bpf_prog_free() also frees prog-\u003eaux-\u003esecurity, which has to stay\\nafter the grace period, so drop bpf_prog_free from sleepable_lsm_hooks\\nrather than move the call. Non-sleepable observers still run there.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/bpf/bpf_lsm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1b67772e4e3f16cd647b229cae95fc06d120be08\",\"lessThan\":\"2135f661fae7160a7fc603cab43cbc7999e8bfce\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1b67772e4e3f16cd647b229cae95fc06d120be08\",\"lessThan\":\"d5f2f741a900123fbcb7c7c0a002b81306fbe242\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1b67772e4e3f16cd647b229cae95fc06d120be08\",\"lessThan\":\"915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1b67772e4e3f16cd647b229cae95fc06d120be08\",\"lessThan\":\"2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/bpf/bpf_lsm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.110\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.52\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.6\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2135f661fae7160a7fc603cab43cbc7999e8bfce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d5f2f741a900123fbcb7c7c0a002b81306fbe242\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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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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