CVE-2026-64554— Linux netfilter 桥接模块 br_ip6_fragment() 悬垂指针漏洞
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一、 漏洞 CVE-2026-64554 基础信息
漏洞信息
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Vulnerability Title
netfilter: bridge: fix stale prevhdr pointer in br_ip6_fragment()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: fix stale prevhdr pointer in br_ip6_fragment() br_ip6_fragment() gets prevhdr, a pointer into the skb head, from ip6_find_1stfragopt(), then calls skb_checksum_help(). For a cloned skb skb_checksum_help() reallocates the head via pskb_expand_head(), leaving prevhdr dangling. It is later dereferenced in ip6_frag_next(), causing a use-after-free write. Save prevhdr's offset before skb_checksum_help() and recompute it after, like commit ef0efcd3bd3f ("ipv6: Fix dangling pointer when ipv6 fragment"). BUG: KASAN: slab-use-after-free in ip6_frag_next (net/ipv6/ip6_output.c:857) Write of size 1 at addr ffff888013ff5016 by task exploit/141 Call Trace: ... kasan_report (mm/kasan/report.c:595) ip6_frag_next (net/ipv6/ip6_output.c:857) br_ip6_fragment (net/ipv6/netfilter.c:212) nf_ct_bridge_post (net/bridge/netfilter/nf_conntrack_bridge.c:407) nf_hook_slow (net/netfilter/core.c:619) br_forward_finish (net/bridge/br_forward.c:66) __br_forward (net/bridge/br_forward.c:115) maybe_deliver (net/bridge/br_forward.c:191) br_flood (net/bridge/br_forward.c:245) br_handle_frame_finish (net/bridge/br_input.c:229) br_handle_frame (net/bridge/br_input.c:442) ... packet_sendmsg (net/packet/af_packet.c:3114) ... do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Kernel panic - not syncing: Fatal exception in interrupt
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-64554 的公开POC
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CVE-2026-64554 补丁与修复 (8)
同批安全公告 · Linux · 2026-07-27 · 共 25 条
| CVE-2026-64542 | IPv6 网络发现 accept_untracked_na() NULL 解引用漏洞 | |
| CVE-2026-64532 | NTFS3 更新记录数据越界访问漏洞 | |
| CVE-2026-64531 | OpenvSwitch 拒绝超大嵌套动作属性漏洞 | |
| CVE-2026-64533 | ntfs3：日志回放转换中lcns_follow验证缺失 | |
| CVE-2026-64534 | Linux nvmet-tcp digest错误处理漏洞 | |
| CVE-2026-64535 | nvmet-tcp 远程代码执行漏洞 | |
| CVE-2026-64536 | rtl8723bs 驱动 is_ap_in_tkip() 函数存在越界读取漏洞 | |
| CVE-2026-64537 | bridge cfm 配置时拒绝无效 CCM 间隔 | |
| CVE-2026-64538 | IPv6 fib6_nh_mtu_change()空指针解引用漏洞 | |
| CVE-2026-64539 | 蓝牙 EIR 标志 AD 预写栈溢出漏洞 | |
| CVE-2026-64540 | USBNet gl620a泛林rx_fixup()越界读取漏洞 | |
| CVE-2026-64541 | net/smc：修复smc_cdc_rx_handler()中的UAF漏洞 | |
| CVE-2026-64555 | KVM ARM64 SPSR_EL2恢复漏洞 | |
| CVE-2026-64543 | TIPC discoverer use-after-free漏洞 | |
| CVE-2026-64544 | crypto: 不对称密钥 pefile_digest_pe_contents 越界读取漏洞 | |
| CVE-2026-64546 | drm/edid: drm_parse_tiled_block()越界读取漏洞 | |
| CVE-2026-64545 | Linux内核BPF模块xpd_master_redirect()空指针解引用漏洞 | |
| CVE-2026-64547 | net1080 驱动 rx_fixup 函数漏洞 | |
| CVE-2026-64548 | bpf sockmap: bpf_msg_push_data() 溢出复制长度拒绝 | |
| CVE-2026-64550 | Qualcomm RMNET MAP帧长度验证漏洞 |
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IV. Related Vulnerabilities
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