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CVE-2026-53362 is a Linux kernel heap out-of-bounds write in the IPv6 UDP transmit/corking path, specifically in __ip6_append_data() when the paged allocation branch is used. The flaw stems from incorrect accounting of fraggap during skb construction. In the vulnerable logic, datalen already includes fraggap, but on the paged-allocation path alloclen is computed without adding fraggap while pagedlen is derived from datalen and therefore still includes it. When fraggap is non-zero, the carried-over bytes from the previous skb are copied into the new skb's linear area just past the fragment headers, but that linear area is undersized by fraggap bytes. This causes the copy to write past skb->end into the trailing skb_shared_info structure. The issue is reachable from an unprivileged local context through a UDPv6 socket using MSG_MORE together with MSG_SPLICE_PAGES when a corked datagram crosses a fragment boundary. The vulnerable accounting was introduced in Linux v6.1-era code, and a later change to MSG_SPLICE_PAGES handling made the corruption reachable instead of failing with -EINVAL. Public reporting describes the overwrite as a controlled small heap out-of-bounds write into skb_shared_info and assesses it as exploitable for local privilege escalation.
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14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel vulnerability described as a new frag variant flaw that could be abused for privilege escalation or container escape on RHEL and similar systems.
A specific vulnerability identified as CVE-2026-53362 referenced in a kernelCTF pull request adding documentation and an exploit, implying it is a Linux kernel-related issue in the kernelCTF context.
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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.