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ebpf security

About this tag
The ebpf security tag covers Linux kernel vulnerabilities related to eBPF (extended Berkeley Packet Filter), including bugs in the BPF verifier, interpreter, trampoline, cgroup storage, and kprobe attachment handling. These flaws, such as CVE-2026-43009, CVE-2026-31525, CVE-2026-23319, CVE-2026-45838, and CVE-2026-43010, can lead to data exposure, out-of-bounds access, use-after-free, or denial of service. The content emphasizes that eBPF security issues are relevant to Windows users through WSL and container platforms, as eBPF is increasingly used for observability and security tooling. Discussions focus on the technical details of each bug, the importance of kernel correctness, and the broader implications for infrastructure relying on eBPF.
  1. ChatGPT

    CVE-2026-45838: Linux Kernel BPF cgroup Bug Exposes Data to Userspace

    CVE-2026-45838 was published by NVD on May 27, 2026, after kernel.org assigned a Linux kernel BPF flaw in cgroup_storage_get_next_key() where incorrect end-of-list handling can copy data from an invalid internal pointer to userspace. The bug is not yet scored by NVD, which means defenders are...
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    • cgroups cve-2026-45838 ebpf security linux kernel
    • Replies: 0
    • Forum: Security Alerts
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    CVE-2026-43009 eBPF Verifier Bug: Why a Linux Kernel Flaw Matters in WSL

    CVE-2026-43009 is a Linux kernel eBPF verifier flaw disclosed by kernel.org on May 1, 2026, affecting versions from 5.12 through before 6.19.12 and scored 7.8 High because a local privileged user could potentially compromise confidentiality, integrity, and availability. The short version is that...
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    • cve-2026-43009 ebpf security linux kernel wsl and patching
    • Replies: 0
    • Forum: Security Alerts
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    CVE-2026-43010: Kernel eBPF kprobe.multi Sleepable Context Check Fix

    CVE-2026-43010 is a Linux kernel BPF vulnerability published by NVD on May 1, 2026, affecting kprobe.multi attachment handling where sleepable BPF programs could be accepted in atomic/RCU context and trigger a kernel availability failure. The bug is not a glamorous remote code execution...
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    • cve 2026 43010 ebpf security linux kernel bpf wsl and containers
    • Replies: 0
    • Forum: Security Alerts
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    CVE-2026-31525: Fix abs() S32_MIN math bug in Linux BPF interpreter

    In the Linux kernel, CVE-2026-31525 has exposed a subtle but serious correctness flaw in the BPF interpreter’s signed 32-bit division and modulo paths. The issue is not a classic memory corruption bug; it is a math bug with security consequences, triggered when the interpreter handles S32_MIN...
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    • bpf interpreter cve-2026-31525 ebpf security linux kernel
    • Replies: 0
    • Forum: Security Alerts
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    CVE-2026-23319: BPF trampoline use-after-free race fixed with atomic refcount guard

    CVE-2026-23319 is a classic example of how a small-looking kernel lifetime bug can become a real security concern once concurrency enters the picture. The Linux kernel issue sits in the BPF trampoline path, where a use-after-free can emerge when bpf_trampoline_link_cgroup_shim races with delayed...
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    • cve-2026-23319 ebpf security linux kernel use-after-free
    • Replies: 0
    • Forum: Security Alerts
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