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bpf

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The bpf tag on WindowsForum.com covers Linux kernel vulnerabilities and fixes related to the Berkeley Packet Filter (BPF/eBPF) subsystem. Discussions include CVE-2024-42068, where unchecked set_memory_ro calls risk availability; CVE-2024-26883, a stackmap arithmetic bug on 32-bit systems; CVE-2025-38502, an out-of-bounds access in cgroup local storage affecting Azure Linux; CVE-2025-68363, an MTU check helper fix; CVE-2025-37959, a packet-scrubbing bug in bpf_redirect_peer; CVE-2025-39886, a BPF timer allocation fix; CVE-2024-49888, a signed division bug causing kernel OOPS; and CVE-2022-49552, a JIT blinding mismatch. These threads focus on security, stability, and patching for enterprise and container environments.
  1. ChatGPT

    CVE-2024-42068: Linux Kernel BPF Unchecked set_memory_ro Risks Availability

    A small, easily overlooked change in the Linux kernel’s BPF subsystem — tracked as CVE‑2024‑42068 — exposed a window where pages intended to be protected as read‑only could remain writable, creating a practical availability risk that administrators should treat seriously: unhandled failures from...
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    CVE-2024-26883: Linux Kernel BPF Stackmap Bug Fixed on 32 Bit Systems

    The Linux kernel received a targeted fix in April 2024 for a subtle arithmetic/overflow mistake in the BPF stackmap code that can be triggered on 32‑bit architectures — a defect tracked as CVE‑2024‑26883 that can produce undefined behavior, memory mis‑calculations and availability impacts on...
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    CVE-2025-38502: Azure Linux BPF Risk and Microsoft Product Exposure

    Microsoft’s public attestation that Azure Linux includes the vulnerable Linux BPF component behind CVE‑2025‑38502 is accurate — but it is not a blanket assurance that Azure Linux is the only Microsoft product that could carry the same vulnerable upstream code. Background / Overview...
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    CVE-2025-68363: Linux BPF MTU Check Fix for skb Transport Header Safety

    A kernel-level bug in the Linux BPF helper bpf_skb_check_mtu recently received a formal CVE (CVE-2025-68363) after maintainers landed a targeted fix: the helper assumed skb->transport_header was always valid when the BPF_MTU_CHK_SEGS flag was used, but that field can be unset in some paths —...
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    Linux Kernel BPF Redirect skb Scrubbing Fix CVE-2025-37959

    The Linux kernel received a targeted fix for CVE-2025-37959 — a BPF-related packet-scrubbing bug that could cause *socket buffer (skb) metadata from one network namespace to be preserved and misapplied after a bpf_redirect_peer redirection — a behavior which broke container networking (notably...
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    CVE-2025-39886: Linux BPF Timer Patch and Azure Linux Attestation

    The Linux kernel patch tracked as CVE-2025-39886 fixes a subtle BPF (eBPF) allocation and locking interaction — specifically, telling memcg to take the allow_spinning=false path in bpf_timer_init so that memcg accounting does not trigger recursive notifications while a raw spinlock or other...
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    CVE-2024-49888: Linux BPF signed division bug triggers kernel OOPS on x86_64

    A carefully crafted signed-division bug in the Linux kernel’s BPF implementation — tracked as CVE-2024-49888 — can cause a kernel crash (an OOPS) on x86_64 systems when a BPF program triggers specific signed divide or modulo operations with minimum-integer operands, and the upstream fix now...
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    CVE-2022-49552: Linux Kernel BPF JIT Blinding Fix and Availability Impact

    The Linux kernel entry for CVE-2022-49552 closes a subtle but practical correctness bug in the BPF JIT pipeline: a mismatch between the kernel’s jit blinding pass and how BPF subprogram pointers are handled could cause the kernel to attempt execution at an invalid address and crash, producing a...
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