bpf: Tighten cgroup storage cookie checks for prog arrays
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.15.192 to before 5.15.212; 6.1.151 to before 6.1.178; 6.6.105 to before 6.6.145; 6.12.46 to before 6.12.97; 6.16.1 to before 6.17 | 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.17 | Patch available | CNA |
| Linux | Linux | 6.17 and later | 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2 | Patch available | CNA |
- Linux VendorLinux Affected 5.15.192 to before 5.15.212; 6.1.151 to before 6.1.178; 6.6.105 to before 6.6.145; 6.12.46 to before 6.12.97; 6.16.1 to before 6.17 Fixed in 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.17 Patch available CNA
- Linux VendorLinux Affected 6.17 and later Fixed in 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.17
- Fix · CNA Linux (Linux) Fixed in 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-74305
- 2026-10-03 Alias added: GHSA-7p9j-gmgx-g4fv
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-30 CVSS score changed · Red Hat
References
Other 7
- https://git.kernel.org/stable/c/87177497cca90bf4fcfb759eb898560eb5b46a10
- https://git.kernel.org/stable/c/1c762d28698483ce7c372091f34d86e4d4828652
- https://git.kernel.org/stable/c/eb73056ce2a6f101ddd3bdba89af6b24ebffff85
- https://git.kernel.org/stable/c/9ca06849c4239aa2d580c54651f8588c51cb398b
- https://git.kernel.org/stable/c/46fbafe3d2d569d828e8d24a7dbe1659f63685cf
- https://git.kernel.org/stable/c/cb22dc79528eb26a46d346c3118dbd6b14c70609
- https://git.kernel.org/stable/c/10627ddc0167aab5c1c390a10ef461e9937aba08
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Sources
- CVE-2026-74305 · CVE Program
- CVE-2026-74305 · NVD
- FIRST EPSS
- GHSA-7p9j-gmgx-g4fv · GitHub Advisory Database · CC BY 4.0
- CVE-2026-74305 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences