CVE-2026-98383— bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL
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.
在 Linux 内核中，以下漏洞已得到修复： BPF：禁止 LWT_SEG6LOCAL 程序调用 bpf_skb_pull_data() LWT_SEG6LOCAL 程序可以通过调用 bpf_lwt_seg6_adjust_srh() 使其缓存的 SRH（Seg6 Route Header）失效，随后再调用 bpf_skb_pull_data()。后者可能会重新分配 skb->head，导致每 CPU 变量的 SRH 指针变为悬空指针（dangling pointer）。在程序执行结束后进行 SRH 验证时，会通过
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-98383
Vulnerability Information
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Vulnerability Title
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL
An LWT_SEG6LOCAL program can invalidate its cached SRH with
bpf_lwt_seg6_adjust_srh() and then call bpf_skb_pull_data(). The latter
may reallocate skb->head, leaving the per-CPU SRH pointer dangling.
Post-program SRH validation then writes through that pointer.
Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL programs so the verifier
rejects this unsafe helper combination. Other LWT program types continue
to expose the helper through lwt_out_func_proto().
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-98383
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Patches & Fixes for CVE-2026-98383 (8)
Same Patch Batch · Linux · 2026-10-09 · 10 CVEs total
| CVE-2026-98384 | bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destroy() | |
| CVE-2026-98382 | bpf: Reject dev-bound-only programs on other devices | |
| CVE-2026-98381 | veth: manage XDP program pointers during channel resize | |
| CVE-2026-98380 | net/sched: reject IDR error pointers when deleting actions | |
| CVE-2026-98378 | bpf: Skip unsettled links in link iterator | |
| CVE-2026-98379 | netfilter: ip6t_rpfilter: reject routes without inet6_dev | |
| CVE-2026-98377 | vlan: require the MAC header to be present in __vlan_insert_inner_tag() | |
| CVE-2026-98376 | bpf: Use array_map_meta_equal for percpu array inner map replacement | |
| CVE-2026-98375 | xen/netfront: drop RX packets with a short Ethernet header |
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions -
CVE-2026-98378
bpf: Skip unsettled links in link iterator
Same vendor: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions -
CVE-2026-98378
bpf: Skip unsettled links in link iterator
V. Comments for CVE-2026-98383
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