bpf: Fix OOB in pcpu_init_value
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · High
- Fix status
- Partial Red Hat: 3 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: Fix OOB in pcpu_init_value An out-of-bounds read occurs when copying element from a BPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the same value_size that is not rounded up to 8 bytes. The issue happens when: 1. A CGROUP_STORAGE map is created with value_size not aligned to 8 bytes (e.g., 4 bytes) 2. A pcpu map is created with the same value_size (e.g., 4 bytes) 3. Update element in 2 with data in 1 pcpu_init_value assumes that all sources are rounded up to 8 bytes, and invokes copy_map_value_long to make a data copy, However, the assumption doesn't stand since there are some cases where the source may not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data. the verifier verifies exactly the size that the source claims, not the size rounded up to 8 bytes by kernel, an OOB happens when the source has only 4 bytes while the copy size(4) is rounded up to 8.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
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 | 5.4.78 to before 5.5; 5.9.9 to before 5.10 | 5.5, 5.10 | Patch available | CNA |
| Linux | Linux | 5.10 and later | 6.1.191, 6.6.141, 6.12.91, 6.18.33, 7.0.10, 7.1 | Patch available | CNA |
- Linux VendorLinux Affected 5.4.78 to before 5.5; 5.9.9 to before 5.10 Fixed in 5.5, 5.10 Patch available CNA
- Linux VendorLinux Affected 5.10 and later Fixed in 6.1.191, 6.6.141, 6.12.91, 6.18.33, 7.0.10, 7.1 Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 5.4.78 to before 5.5; 5.9.9 to before 5.10; 5.10.1 to before 6.6.141; 6.7 to before 6.12.91; 6.13 to before 6.18.33; 6.19 to before 7.0.10 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.10:-:*:*:*:*:*:* | 5.10 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.10:rc4:*:*:*:*:*:* | 5.10 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.10:rc5:*:*:*:*:*:* | 5.10 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.10:rc6:*:*:*:*:*:* | 5.10 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.10:rc7:*:*:*:*:*:* | 5.10 rc7 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.4.78 to before 5.5; 5.9.9 to before 5.10; 5.10.1 to before 6.6.141; 6.7 to before 6.12.91; 6.13 to before 6.18.33; 6.19 to before 7.0.10 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.10:-:*:*:*:*:*:* Versions 5.10 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.10:rc4:*:*:*:*:*:* Versions 5.10 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.10:rc5:*:*:*:*:*:* Versions 5.10 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.10:rc6:*:*:*:*:*:* Versions 5.10 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.10:rc7:*:*:*:*:*:* Versions 5.10 rc7 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.5, 5.10
- Fix · CNA Linux (Linux) Fixed in 6.1.191, 6.6.141, 6.12.91, 6.18.33, 7.0.10, 7.1
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: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-53076
- 2026-10-03 Alias added: GHSA-645x-23wh-rhvm
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-19 Weakness changed · CISA ADP
- 2026-10-30 Fix available: Linux/[email protected], Linux/Linux@d138ea2fe01c254413d5a6104eb236e0d5c7dd9a · CNA
- 2026-10-30 1 new reference · CNA
- 2026-11-03 CVSS score changed · Red Hat
References
Patch 5
- https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9
- https://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e
- https://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c
- https://git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894c
- https://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2026-53076 · CVE Program
- CVE-2026-53076 · NVD
- FIRST EPSS
- GHSA-645x-23wh-rhvm · GitHub Advisory Database · CC BY 4.0
- CVE-2026-53076 · 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