CVE-2026-99055

In the Linux kernel, the following vulnerability has been resolved: tcp: reject net_iov in zerocopy receive mapping hints After copying a readable prefix, receive_fallback_to_copy() asks tcp_zerocopy_set_hint_for_skb() where page mapping can resume. If the next skb is unreadable, find_next_mappable_frag() passes its net_iov fragment to can_map_frag(). skb_frag_page() returns NULL for a net_iov, but can_map_frag() dereferences it in PageCompound(). A v7.2 KASAN run on a connected TCP socket with 64 readable bytes followed by a 4096-byte NET_IOV_DMABUF fragment reported: BUG: KASAN: null-ptr-deref in can_map_frag tcp_zerocopy_receive -> can_map_frag Kernel panic - not syncing: KASAN: panic_on_warn set The diagnostic inserted the net_iov directly because the test host has no devmem-capable NIC. Hardware end-to-end reachability remains untested and requires CONFIG_NET_DEVMEM plus a supported DMA-buf-bound RX queue. Reject all net_iov fragments before skb_frag_page(). This covers both DMABUF and IOURING net_iov types while leaving page-backed checks unchanged. With the guard, the same queue copied the readable prefix, returned a 4096-byte skip hint, and completed without a fault.

• https://git.kernel.org/stable/c/1c7463ac0e99cc91c4eecc1b69a740ef1a619932
• https://git.kernel.org/stable/c/3aa6f536a95eb0617c313ae2eb76fdfa85331f85
• https://git.kernel.org/stable/c/563d3564513496b9ce3b3ba7a5154427554d0f06
• https://git.kernel.org/stable/c/8b1f0af1fd5fd113432233ed8a3862ee7c30a84f

Published

Oct 23, 2026

Last Modified

Oct 23, 2026

Status

Received

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-9905Use after free in Accessibility in Google Chrome on Windows …8.3
• CVE-2026-99050In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-99051In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-99052In the Linux kernel, the following vulnerability has been re…
• CVE-2026-99053In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-99054In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-99056In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-99057In the Linux kernel, the following vulnerability has been re…
• CVE-2026-99058In the Linux kernel, the following vulnerability has been re…
• CVE-2026-99059In the Linux kernel, the following vulnerability has been re…7.7
• CVE-2026-9906Out of bounds write in GPU in Google Chrome prior to 148.0.7…8.3
• CVE-2026-99060In the Linux kernel, the following vulnerability has been re…