availability risk

About this tag
The availability risk tag covers vulnerabilities and bugs that primarily threaten system uptime and service continuity rather than data confidentiality or code execution. Content under this tag includes Linux kernel CVEs affecting TCP socket migration, Ethernet drivers, CAN bus synchronization, VSOCK credit accounting, and filesystem journaling, as well as a Microsoft DoS vulnerability and a QEMU paravirtualized RDMA bug. Recurring themes include denial-of-service conditions, kernel panics, resource exhaustion, and subtle lifecycle or locking errors that can crash systems or degrade service. While many issues originate in Linux, their relevance extends to mixed Windows/Linux environments, WSL, Azure-hosted workloads, and enterprise infrastructure where availability is critical.

  1. CVE-2026-46015 Linux TCP Bug: Missing Listener Wakeup in SO_REUSEPORT

    CVE-2026-46015 is a Linux kernel TCP bug published by NVD on May 27, 2026, after kernel.org reported a missing listener wakeup during SO_REUSEPORT socket migration in the TCP accept path. The bug is not a flashy remote-code-execution headline, and NVD had not assigned CVSS severity at...
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    • availability risk linux kernel so_reuseport tcp networking
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  2. CVE-2026-31563: Linux macb Ethernet TX cleanup fix and why it matters

    CVE-2026-31563 is a reminder that some of the most consequential kernel security fixes are not dramatic memory-corruption rewrites, but small context-correctness changes in code paths that run under heavy pressure. The flaw sits in the Linux kernel’s Cadence MACB/GEM Ethernet driver, where...
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    • availability risk cve triage linux kernel security network driver
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  3. CVE-2026-23362 Linux CAN BCM Lock Fix: Availability Risk for Mixed Windows/WSL Fleets

    CVE-2026-23362 is a reminder that some of the most consequential Linux kernel fixes are not dramatic remote-code-execution stories, but precise corrections in synchronization code that protect specialized systems from crashing at the worst possible moment. The flaw affects the Linux kernel’s CAN...
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    • availability risk can bcm linux kernel security wsl and azure
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  4. CVE-2026-35535: Microsoft DoS Vulnerability and How to Triage Availability Risk

    Background CVE-2026-35535 is a Denial of Service issue in Microsoft’s Security Update Guide, and the language used in the advisory makes one thing clear: this is not about data theft or code execution, but about availability. In Microsoft’s own severity framing, the attacker can either fully...
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    • availability risk cve 2026 35535 denial of service microsoft security updates
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  5. Linux Kernel VSOCK CVE-2026-23069: Arithmetic Underflow Fix for Availability

    The Linux kernel received a targeted fix in February 2026 for a subtle but real arithmetic bug in the virtio VSOCK transport that can let a remote peer cause the kernel to believe far more transmit credit is available than it actually is, with practical consequences for host and guest...
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    • availability risk cve 2026 23069 linux kernel vsock virtio
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  6. QEMU pvrdma CVE-2023-1544: Bounds check prevents guest-triggered host DoS

    A subtle boundary-checking bug in QEMU’s paravirtual RDMA implementation — tracked as CVE-2023-1544 — can be triggered by a guest to cause an out-of-bounds read in pvrdma_ring_next_elem_read(), crashing the qemu process and producing a host-side denial-of-service that operators and cloud...
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    • availability risk cve 2023 1544 qemu pvrdma virtualization security
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  7. OCFS2 CVE-2024-42077 Fix Prevents Journal Credit Exhaustion and Availability Loss

    A subtle accounting error inside the OCFS2 filesystem’s Direct I/O path has been fixed as CVE-2024-42077 — a bug that could exhaust journaling transaction credits during large or heavily fragmented DIO writes and force the filesystem to abort, producing kernel panics and a complete loss of...
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    • availability risk cluster storage kernel security ocfs2
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  8. CVE-2025-38149 Linux PHY Lifecycle Bug and Availability Risk

    A subtle lifecycle bug in the Linux kernel’s PHY subsystem — tracked as CVE-2025-38149 — can cause a kernel crash when a network port is disabled and later re-enabled, and operators should treat the issue as an availability-first vulnerability that demands prompt, targeted patching and careful...
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    • availability risk cve 2025 38149 linux kernel phy subsystem
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  9. CVE-2025-50094 MySQL Server DoS: Patch and Mitigation Guide

    Oracle’s July 2025 Critical Patch Update disclosed a denial‑of‑service weakness in MySQL Server — tracked as CVE‑2025‑50094 — that can be triggered over the network by a high‑privilege database account to repeatedly crash or hang mysqld, producing sustained or persistent loss of availability...
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    • availability risk cve 2025 50094 mysql security network based attack
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  10. Silencing a Noisy Kernel Warn: CVE-2024-44940 and FOU/GUE

    A compact change in the Linux networking stack — the removal of a debug warning from the FOU/GUE receive path — landed as CVE-2024-44940 and has prompted a surprisingly broad operational conversation: a one-line silence in gue_gro_receive stopped noisy, easily‑constructed packets from triggering...
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    • availability risk cve 2024 44940 kernel diagnostics linux kernel
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  11. CVE-2022-3510: Protobuf Java parsing bug triggers heavy GC and DoS risk

    A subtle parsing bug in Google’s Protocol Buffers Java implementation (protobuf‑java and protobuf‑javalite) — tracked as CVE‑2022‑3510 — can be weaponized to produce prolonged garbage collection stalls and a practical denial‑of‑service against Java services that parse crafted messages using...
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    • availability risk cve 2022 3510 garbage collection protobuf java
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  12. Libvirt CVE-2024-2496 Patch Udev Crash to Stop DoS

    Libvirt contains a concurrency-driven null-pointer dereference in the udevConnectListAllInterfaces() path that can crash the libvirt management daemon and produce a denial‑of‑service on affected hosts; vendors and upstream have released small, surgical fixes, but the operational risk to...
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    • availability risk cve 2024 2496 libvirt security patch
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  13. CVE-2025-37972: Small Linux patch fixes MTK PMIC keys null pointer crash

    A small, surgical change to the Linux kernel this spring closed a latent robustness hole in MediaTek’s PMIC input driver, but the bug and its patch underscore a repeated theme for embedded and mobile Linux users: tiny null-pointer mistakes in low-level drivers can produce outsized availability...
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    • availability risk embedded devices linux kernel mtk pmic keys
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  14. CVE-2025-37798: Linux traffic control qdisc idempotent notifications fix

    The Linux kernel networking scheduler received a surgical but consequential change that was recorded as CVE‑2025‑37798: maintainers removed the historical check of sch->q.qlen (the qdisc’s queue length) before calling qdisc_tree_reduce_backlog(), after first making all qlen_notify() callbacks...
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    • availability risk cve 2025 37798 linux kernel traffic control
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  15. Linux Kernel Reverts IPMI Patch After Stability Regression CVE-2025-40192

    A short, surgical but consequential change in the Linux kernel has been rolled back after it introduced an unexpected stability regression: maintainers reverted a patch titled "ipmi: fix msg stack when IPMI is disconnected" because the change could cause the IPMI driver to enter an infinite loop...
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    • availability risk cve 2025 40192 ipmi linux kernel
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  16. CVE-2024-43872 Linux: HNS RDMA CEQE moved to BH to prevent soft lockups

    A recently disclosed Linux-kernel vulnerability, tracked as CVE‑2024‑43872, exposes a stability risk in the RDMA HNS (Hisilicon) driver by allowing the CPU to remain in interrupt context for too long under heavy Completion Event Queue Entry (CEQE) load — a condition that can produce sustained...
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    • availability risk cve 2024 43872 hns rdma linux kernel
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  17. CVE-2025-40247: Qualcomm MSM DRM VM_BIND NULL Pointer Fix in Kernel

    A focused, low-level kernel bug in the Qualcomm MSM DRM driver has been assigned CVE‑2025‑40247 after maintainers fixed a faulty error‑path in the page‑table preallocation cleanup that could cause a kernel NULL pointer dereference and host instability; operators who run kernels that include the...
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    • availability risk cve vulnerabilities drm linux kernel
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  18. CVE-2023-53292: Fix for blk mq race prevents kernel NULL pointer crash

    A subtle race in the Linux block multi-queue (blk‑mq) subsystem that could cause a kernel NULL‑pointer dereference has been fixed upstream and catalogued as CVE‑2023‑53292 — a local, availability‑impacting defect that requires kernel updates or vendor-supplied backports to fully remediate...
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    • availability risk blk mq cve 2023 53292 linux kernel
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