linux kernel security

In the Linux kernel’s mac80211 wireless stack, a newly assigned vulnerability tracked as CVE-2026-23246 highlights a classic but still dangerous bug class: an out-of-bounds write caused by trusting an unvalidated index in a low-level parser. The issue sits in ieee80211_ml_reconfiguration, where...

The Linux kernel’s nf_tables subsystem is once again in the security spotlight, this time for a flaw that looks subtle on paper but speaks volumes about how tricky transaction handling can be in kernel code. CVE-2026-23278 addresses a bug in catchall element cleanup, where the kernel may need to...

Linux kernel CVE-2026-23274 is a small-looking bug with a very specific failure mode, but it sits in exactly the kind of kernel plumbing that can turn a bookkeeping mistake into a crash. The issue is in the netfilter xt_IDLETIMER path: revision 0 rules can reuse an existing timer object by...

In February 2026, the Linux kernel’s RxRPC subsystem received a small-looking but technically important correction: a data-race warning was eliminated, and a possible load/store tearing problem on 32-bit systems was removed at the same time. The issue landed as CVE-2026-23118, and while it is...

The Linux kernel’s F2FS filesystem has received a security-relevant fix for a race condition that can leave the IS_CHECKPOINTED flag in an inconsistent state when atomic commit and checkpoint writes overlap. The issue was discussed on the F2FS mailing list in late December 2025, then applied to...

The Linux kernel’s /proc/net/ptype path is getting a security-focused fix that looks small on the surface but matters because it closes a classic concurrency hole: iterating packet type handlers without enough read-side protection. The issue is tracked as CVE-2026-23255, and the upstream change...

The Linux kernel’s io_uring subsystem is back in the security spotlight, this time for a bug centered on request cleanup in the read/write path. The issue, now tracked as CVE-2026-23259, is described as a failure to free a potentially allocated iovec when cache insertion fails during teardown...

The Microsoft Security Response Center page for CVE-2026-23269 is unavailable, but the underlying issue appears to be an upstream Linux AppArmor fix involving validation of DFA start-state bounds in unpack_pdb. The kernel-side patch context points to a defensive hardening change in AppArmor’s...

This vulnerability is a reminder that even mature kernel subsystems can still fail in subtle, arithmetic-driven ways when device timing, packet sizing, and buffer math collide. CVE-2026-23208 affects the Linux kernel’s ALSA USB-audio path and was fixed after researchers and fuzzing...

The Microsoft Security Response Center page for CVE-2026-23169 is unavailable, but the title itself tells a clear story: this is a Linux kernel MPTCP fix, not a Windows product flaw, and the issue centers on a race in mptcp_pm_nl_flush_addrs_doit(). The available evidence points to a concurrency...

CVE-2026-23221 is another reminder that small-looking kernel bugs can have large security consequences: Microsoft’s update guide entry appears to have been removed or is temporarily unavailable, but the vulnerability title itself points to a use-after-free in the Linux fsl-mc bus code...

The Linux kernel’s Btrfs filesystem has always lived at an interesting intersection of flexibility and fragility: it is a copy-on-write filesystem built for snapshots, checksumming, and online recovery, yet it must also behave sensibly when the filesystem is damaged, mounted read-only, or being...

The Linux kernel has a new RDMA security fix in the umad userspace MAD access path: ib_umad_write() now rejects negative data_len values. That sounds like a small validation change, but in kernel code these checks often separate a harmless bad input from a memory-safety bug or a broader...

The Linux kernel’s act_gate traffic-control action is getting a focused security fix after maintainers identified a schedule-lifetime race that can appear when the gate is being replaced while either the hrtimer callback or the dump path is still traversing the schedule list. The upstream patch...

The Linux kernel's netfilter subsystem has a new, high-consequence memory-corruption fix that any Linux systems team running nftables must treat as urgent: CVE-2026-23231 patches a race-triggered use-after-free in nf_tables_addchain() that can leave published chain objects accessible to active...

The short answer is: No — Azure Linux is not necessarily the only Microsoft product that could include the vulnerable nf_tables code, but it is the only Microsoft product Microsoft has publicly attested so far as carrying that upstream component. Microsoft’s advisory is a product-level inventory...

A carefully scoped upstream fix for a Linux kernel memory-allocation bug—tracked as CVE-2024-39474—has rekindled an operational question many administrators ask when a vendor publishes a product-scoped vulnerability attestation: when Microsoft says “Azure Linux includes this open‑source library...

Microsoft’s one-line MSRC attestation that “Azure Linux includes this open‑source library and is therefore potentially affected” is accurate as a product-level inventory statement — but it is not a technical guarantee that no other Microsoft product can contain the same vulnerable NFS server...

The short answer is: No — Azure Linux is the Microsoft product that Microsoft has publicly attested as shipping the JFFS2 component and therefore is a confirmed “potentially affected” product for CVE‑2025‑38194, but that wording is a scoped attestation, not a universal guarantee that no other...

A simple missing NULL check inside a Linux kernel serial driver has been assigned CVE-2025-38135 — a low-level bug that can trigger a kernel-level null pointer dereference and, in the worst cases, a denial-of-service crash on affected systems. The fix is straightforward: check the return value...