In 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.

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00172.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

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Vendors Products
References
Link Providers
https://git.kernel.org/stable/c/10627ddc0167aab5c1c390a10ef461e9937aba08 cve-icon cve-icon
https://git.kernel.org/stable/c/1c762d28698483ce7c372091f34d86e4d4828652 cve-icon cve-icon
https://git.kernel.org/stable/c/46fbafe3d2d569d828e8d24a7dbe1659f63685cf cve-icon cve-icon
https://git.kernel.org/stable/c/87177497cca90bf4fcfb759eb898560eb5b46a10 cve-icon cve-icon
https://git.kernel.org/stable/c/9ca06849c4239aa2d580c54651f8588c51cb398b cve-icon cve-icon
https://git.kernel.org/stable/c/cb22dc79528eb26a46d346c3118dbd6b14c70609 cve-icon cve-icon
https://git.kernel.org/stable/c/eb73056ce2a6f101ddd3bdba89af6b24ebffff85 cve-icon cve-icon
History

Sat, 15 Aug 2026 17:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-665
CWE-730

Sat, 15 Aug 2026 06:15:00 +0000

Type Values Removed Values Added
Description In 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.
Title bpf: Tighten cgroup storage cookie checks for prog arrays
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-15T05:58:06.654Z

Reserved: 2026-08-15T05:44:03.882Z

Link: CVE-2026-74305

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-15T06:22:30.190

Modified: 2026-08-15T06:22:30.190

Link: CVE-2026-74305

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-15T17:00:12Z