GHSA-6WG8-P2J3-RXG8
Vulnerability from github – Published: 2026-09-17 18:31 – Updated: 2026-09-17 18:31In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix sleepable check for tracing/lsm prog
When CONFIG_FUNCTION_ERROR_INJECTION is disabled, a sleepable tracing prog is allowed to attach to '__x64_'-alike prefix symbols.
It is because the verifier does not verify whether the symbol is a kernel function or a bpf prog. That said, a sleepable tracing prog is allowed to attach to a bpf prog target whose name has '__x64_'-alike prefix.
For example, a sleepable fentry prog attaches to a '__x64_sys_nop' XDP prog, and copies buffer from a user pointer with bpf_copy_from_user() helper. After attaching the XDP prog to lo interface, the kernel BUG could be triggered by 'ping -c 1 -W 1 127.0.0.1':
[ 3.460756] BUG: sleeping function called from invalid context at kernel/bpf/trampoline.c:1324
Fix it by disallowing sleepable prog always when its target btf is not a kernel's btf.
{
"affected": [],
"aliases": [
"CVE-2026-90299"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:17:27Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix sleepable check for tracing/lsm prog\n\nWhen CONFIG_FUNCTION_ERROR_INJECTION is disabled, a sleepable tracing prog\nis allowed to attach to \u0027__x64_\u0027-alike prefix symbols.\n\nIt is because the verifier does not verify whether the symbol is a kernel\nfunction or a bpf prog. That said, a sleepable tracing prog is allowed to\nattach to a bpf prog target whose name has \u0027__x64_\u0027-alike prefix.\n\nFor example, a sleepable fentry prog attaches to a \u0027__x64_sys_nop\u0027 XDP\nprog, and copies buffer from a user pointer with bpf_copy_from_user()\nhelper. After attaching the XDP prog to lo interface, the kernel BUG\ncould be triggered by \u0027ping -c 1 -W 1 127.0.0.1\u0027:\n\n[ 3.460756] BUG: sleeping function called from invalid context at kernel/bpf/trampoline.c:1324\n\nFix it by disallowing sleepable prog always when its target\nbtf is not a kernel\u0027s btf.",
"id": "GHSA-6wg8-p2j3-rxg8",
"modified": "2026-09-17T18:31:59Z",
"published": "2026-09-17T18:31:59Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90299"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/00244bdaa423d93f4571f3f6854378ce3365e524"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/976f1be72740cfbc351d3841fd21186dda3ea723"
}
],
"schema_version": "1.4.0",
"severity": []
}
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.
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.
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.