What’s Vulnerable › Vulnerabilities

CVE-2026-90300: bpf: Clear buf on error in __bpf_get_task_stack

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Clear buf on error in __bpf_get_task_stack Both bpf_get_task_stack and bpf_get_task_stack_sleepable helpers that use __bpf_get_task_stack have buf defined as ARG_PTR_TO_UNINIT_MEM argument and we should initialize the buf on every return path. Adding missing buf memset for __bpf_get_task_stack fail paths. This provides deterministic buffer contents, which is useful when the buffer is used directly as a map key.

Affected products

• Linux: from 5.10.30 before 5.11; from 5.11.14 before 5.12; from 5.10.96 before 5.11 — fixed in 5.11, 5.12

How to fix

Upgrade to a fixed version: Linux 5.11, 5.12. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1f0f61573ba4cb899105b5cef65be3ca02205f93
• https://git.kernel.org/stable/c/4acc761b4e3feca1eb648d21fc4d665b23c5372d
• https://git.kernel.org/stable/c/5c4c57a277a87ed235183d03b671d346f5101f62
• https://git.kernel.org/stable/c/6f5a7bcc049709af12e403111d5e73e80910dafc
• https://git.kernel.org/stable/c/f523359c4789bb0396d2d642464a6e2fd4f2299d
• https://git.kernel.org/stable/c/f5d242825ca417bb6afe35fde6e8880f97ca43fb

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