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CVE-2026-81002— xdp: fix zero-copy frame layout

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于xdp_convert_zc_to_xdp_frame()将XSK数据包复制到order-0页时，将PAGE_SIZE作为帧大小，导致复制帧占用skb_shared_info所需的页尾空间，且未记录headroom，使通过cpumap重定向的AF_XDP零拷贝数据包可能使skb与skb_shared_info重叠或超出已分配页面，造成越界访问。

CVSS 9.8 · Critical EPSS 0.52% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b0d1beeff2a97a0cf1965ea8f1d13b8973f22582< dcb6db9ca6515fcd3e00c93ec5e27dc7a0a7012f affected
b0d1beeff2a97a0cf1965ea8f1d13b8973f22582< 22092730129077c302d8c947bbe0876f0280c528 affected
b0d1beeff2a97a0cf1965ea8f1d13b8973f22582< ced3e18cd9b9caf630aaa1e1eac305f5192ba896 affected
b0d1beeff2a97a0cf1965ea8f1d13b8973f22582< 6de17275b3ccdf9887568b07e54da2e3597217cf affected
b0d1beeff2a97a0cf1965ea8f1d13b8973f22582< 444216dacdbebd3e52d5e704facafbb230da09e9 affected
b0d1beeff2a97a0cf1965ea8f1d13b8973f22582< 15d1f3c0dbe7a740f779337deb39f23cd8d002c8 affected
b0d1beeff2a97a0cf1965ea8f1d13b8973f22582< 68d7cc5512238693670fc19c7a615df631e10edf affected
b0d1beeff2a97a0cf1965ea8f1d13b8973f22582< 71283aaa6c65b3cec84caf1dc78560985737641f affected
… +10 more rows
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I. Basic Information for CVE-2026-81002

Vulnerability Information
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Vulnerability Title
xdp: fix zero-copy frame layout
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xdp: fix zero-copy frame layout xdp_convert_zc_to_xdp_frame() clones an XSK packet into an order-0 page and advertises PAGE_SIZE as its frame size. It allows the copied frame to occupy the page tail needed by skb_shared_info and records zero headroom even when metadata separates the frame header from packet data. An AF_XDP zero-copy packet redirected through cpumap can therefore make the skb overlap skb_shared_info or place it beyond the allocated page. Limit the copied layout to SKB_WITH_OVERHEAD(PAGE_SIZE) and include the metadata length in frame headroom. Redirect callers already handle a NULL conversion result. BUG: KASAN: slab-out-of-bounds in skb_gro_receive Write of size 4 at addr ffff88800cf37004 by task cpumap/1/map:1/146 Call Trace: skb_gro_receive (net/core/gro.c:174) udp_gro_receive (net/ipv4/udp_offload.c:812) inet_gro_receive (net/ipv4/af_inet.c:1539) dev_gro_receive (net/core/gro.c:515) gro_receive_skb (net/core/gro.c:633) cpu_map_kthread_run (kernel/bpf/cpumap.c:395) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:164) ret_from_fork_asm (arch/x86/entry/entry_64.S:255) Kernel panic - not syncing: KASAN: panic_on_warn set ...
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于xdp_convert_zc_to_xdp_frame()将XSK数据包复制到order-0页时，将PAGE_SIZE作为帧大小，导致复制帧占用skb_shared_info所需的页尾空间，且未记录headroom，使通过cpumap重定向的AF_XDP零拷贝数据包可能使skb与skb_shared_info重叠或超出已分配页面，造成越界访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 ~ dcb6db9ca6515fcd3e00c93ec5e27dc7a0a7012f -
Linux Linux 4.20 -

II. Public POCs for CVE-2026-81002

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III. Intelligence Information for CVE-2026-81002

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Patches & Fixes for CVE-2026-81002 (8)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89688 9.8 CRITICAL nfsd: drop the stateid, not the stateowner, on seqid_op replay retry
CVE-2026-89656 9.8 CRITICAL libceph: reject buckets with mismatched CRUSH ids
CVE-2026-89655 9.8 CRITICAL ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock
CVE-2026-89658 9.8 CRITICAL NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup
CVE-2026-89660 9.8 CRITICAL NFSD: Prevent client use-after-free during admin state revocation
CVE-2026-89659 9.8 CRITICAL NFSD: Prevent client use-after-free during delegation revoke
CVE-2026-89662 9.8 CRITICAL NFSD: Prevent lock owner use-after-free during client teardown
CVE-2026-89669 9.8 CRITICAL nfsd: initialize copy-notify stateid before publishing it
CVE-2026-89674 9.8 CRITICAL nfsd: fix XDR length calculation in nfsd4_ff_encode_layoutget
CVE-2026-89675 9.8 CRITICAL nfsd: fix UAF in async copy cancel and shutdown
CVE-2026-89676 9.8 CRITICAL nfsd: fix stale s2s_cp_stateids IDR entry for async COPY
CVE-2026-89677 9.8 CRITICAL nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file()
CVE-2026-89681 9.8 CRITICAL nfsd: fix layout fence worker double-reference race
CVE-2026-89686 9.8 CRITICAL nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke
CVE-2026-89478 9.8 CRITICAL sctp: drop a chunk if its transport was removed
CVE-2026-89479 9.8 CRITICAL sctp: stop processing a packet once its association is deleted
CVE-2026-89702 9.8 CRITICAL nfsd: size fh_verify server sockaddr slot by xpt_locallen
CVE-2026-89703 9.8 CRITICAL nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations
CVE-2026-89482 9.8 CRITICAL nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89708 9.8 CRITICAL nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

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Same vendor: Linux

V. Comments for CVE-2026-81002

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