GHSA-7P9J-GMGX-G4FV
Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33In the Linux kernel, the following vulnerability has been resolved:
bpf: Tighten cgroup storage cookie checks for prog arrays
The fix in commit abad3d0bad72 ("bpf: Fix oob access in cgroup local storage") is still incomplete. The prog-array compatibility check treats a program with no cgroup storage as compatible with any stored storage cookie. This allows a storage-less program to bridge a tail call chain between an entry program and a storage-using callee even though cgroup local storage at runtime still follows the caller's context, that is, A -> B(no storage) -> C(storage) path.
Requiring exact cookie equality would break the legitimate case of a storage-less leaf program being tail called from a storage-using one. Instead, only accept a zero storage cookie if the program cannot perform tail calls itself. This keeps A -> B(no storage) working while rejecting the A -> B(no storage) -> C(storage) bridge.
{
"affected": [],
"aliases": [
"CVE-2026-74305"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T06:22:30Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Tighten cgroup storage cookie checks for prog arrays\n\nThe fix in commit abad3d0bad72 (\"bpf: Fix oob access in cgroup local\nstorage\") is still incomplete. The prog-array compatibility check\ntreats a program with no cgroup storage as compatible with any stored\nstorage cookie. This allows a storage-less program to bridge a tail\ncall chain between an entry program and a storage-using callee even\nthough cgroup local storage at runtime still follows the caller\u0027s\ncontext, that is, A -\u003e B(no storage) -\u003e C(storage) path.\n\nRequiring exact cookie equality would break the legitimate case of a\nstorage-less leaf program being tail called from a storage-using one.\nInstead, only accept a zero storage cookie if the program cannot\nperform tail calls itself. This keeps A -\u003e B(no storage) working\nwhile rejecting the A -\u003e B(no storage) -\u003e C(storage) bridge.",
"id": "GHSA-7p9j-gmgx-g4fv",
"modified": "2026-08-17T06:33:37Z",
"published": "2026-08-15T06:32:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74305"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/10627ddc0167aab5c1c390a10ef461e9937aba08"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1c762d28698483ce7c372091f34d86e4d4828652"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/46fbafe3d2d569d828e8d24a7dbe1659f63685cf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/87177497cca90bf4fcfb759eb898560eb5b46a10"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9ca06849c4239aa2d580c54651f8588c51cb398b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cb22dc79528eb26a46d346c3118dbd6b14c70609"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/eb73056ce2a6f101ddd3bdba89af6b24ebffff85"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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