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CVE-2026-23204 is an out-of-bounds memory-access vulnerability in the Linux kernel traffic-control u32 classifier. The classifier uses skb_header_pointer() on an offset that can be negative; that helper does not fully validate negative offsets. A crafted condition can consequently cause u32_classify() to access memory outside the intended packet buffer, producing a KASAN-detected slab out-of-bounds fault. The fix replaces the unsafe helper with skb_header_pointer_careful(), which performs the required validation.
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49 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel vulnerability in net/sched cls_u32 related to safer skb header pointer handling.
A Linux kernel net/sched cls_u32 vulnerability referenced by the advisory as requiring skb_header_pointer_careful().
A Linux kernel vulnerability in net/sched cls_u32 where insufficient validation of negative offset values in skb_header_pointer() can lead to a slab out-of-bounds condition in u32_classify().
A Linux kernel vulnerability in net/sched cls_u32 addressed by safer skb header pointer handling.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.