{"id":120443,"date":"2026-10-31T18:40:30","date_gmt":"2026-10-31T10:40:30","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/120443.html"},"modified":"2026-10-31T18:40:30","modified_gmt":"2026-10-31T10:40:30","slug":"cve-2026-98432-%e6%bc%8f%e6%b4%9e%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/120443.html","title":{"rendered":"CVE-2026-98432 \u6f0f\u6d1e\u8be6\u89e3"},"content":{"rendered":"<h2>CVE-2026-98432 \u6f0f\u6d1e\u8be6\u89e3<\/h2>\n<p>CVE-2026-98432 \u5f15\u5165\u4e86 Linux \u5185\u6838 IPv4 TCP \u534f\u8bae\u6808\u4e2d\u4e00\u4e2a\u4e25\u91cd\u7684\u201c\u91ca\u653e\u540e\u4f7f\u7528\u201d&#xff08;Use-After-Free, UAF&#xff09;\u7ade\u6001\u6761\u4ef6\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u7684\u5b98\u65b9 CVSS \u8bc4\u5206\u9ad8\u8fbe 9.8&#xff08;\u4e25\u91cd\u7b49\u7ea7&#xff09;\u3002\u5b83\u5728 2026 \u5e74 10 \u6708\u4e2d\u65ec\u88ab\u516c\u5f00\u62ab\u9732&#xff0c;\u5e76\u5728\u5b89\u5168\u9886\u57df\u5f15\u53d1\u4e86\u5de8\u5927\u9707\u52a8&#xff0c;\u56e0\u4e3a AI \u7814\u7a76\u6a21\u578b\u5728\u6d4b\u8bd5\u4e2d\u80fd\u591f\u5728\u4e0d\u5230\u4e00\u4e2a\u5c0f\u65f6\u5185\u81ea\u52a8\u7f16\u5199\u51fa\u5b8c\u6574\u7684\u8fdc\u7a0b\u4ee3\u7801\u6267\u884c&#xff08;RCE&#xff09;\u5229\u7528\u94fe\u3002<\/p>\n<h3>1. \u5f15\u5165\u65f6\u95f4\u4e0e\u6839\u672c\u539f\u56e0<\/h3>\n<p>\u8be5\u6f0f\u6d1e\u6700\u65e9\u53ef\u8ffd\u6eaf\u81f3 Linux Kernel 4.4 \u7248\u672c\u3002\u5f53\u65f6\u5185\u6838\u5f15\u5165\u4e86\u4f18\u5316 TCP\/DCCP \u5904\u7406\u7684\u673a\u5236&#xff08;\u7279\u522b\u662f\u81ea\u63d0\u4ea4\u8bb0\u5f55 079096f103fa \u5f00\u59cb&#xff0c;\u5141\u8bb8\u5728\u4e0d\u6301\u6709\u76d1\u542c\u5668\u9501\u7684\u60c5\u51b5\u4e0b\u5904\u7406\u8bf7\u6c42\u5957\u63a5\u5b57&#xff09;\u3002<\/p>\n<ul>\n<li>\u673a\u5236\u8bbe\u8ba1\u7f3a\u9677&#xff1a;\u5728\u5efa\u7acb IPv4 TCP \u4e09\u6b21\u63e1\u624b\u9636\u6bb5&#xff0c;\u5f53\u8fde\u63a5\u6210\u529f\u5b8c\u6210\u65f6&#xff0c;\u51fd\u6570 tcp_v4_syn_recv_sock() \u4f1a\u5c06\u539f\u672c\u5b58\u50a8\u5728\u5f85\u5904\u7406\u8bf7\u6c42&#xff08;Request Socket&#xff09;\u4e2d\u7684 IP \u9009\u9879\u6307\u9488&#xff08;ireq-&gt;ireq_opt&#xff09;\u76f4\u63a5\u4f20\u9012\u7ed9\u65b0\u521b\u5efa\u7684\u5b50\u5957\u63a5\u5b57&#xff08;newinet-&gt;inet_opt&#xff09;&#xff0c;\u800c\u6ca1\u6709\u5bf9\u5176\u8fdb\u884c\u6df1\u62f7\u8d1d&#xff08;Deep Copy&#xff09;\u3002<\/li>\n<li>\u7ade\u6001\u6761\u4ef6&#xff08;Race Condition&#xff09;&#xff1a;\u5982\u679c\u6b64\u65f6\u6709\u53e6\u4e00\u4e2a CPU \u6838\u5fc3\u5e76\u53d1\u5904\u7406\u8be5\u8bf7\u6c42\u5957\u63a5\u5b57\u7684\u91cd\u4f20 SYN \u5c01\u5305&#xff0c;\u6216\u8005\u89e6\u53d1\u4e86\u8bf7\u6c42\u8fc1\u79fb&#xff08;\u5982\u5f00\u542f\u4e86 net.ipv4.tcp_migrate_req&#061;1&#xff09;&#xff0c;\u53e6\u4e00\u4e2a\u8def\u5f84\u4e0a\u7684 tcp_check_req() \u4ecd\u7136\u4f1a\u5728\u4ec5\u6709 RCU \u8bfb\u9501\u4fdd\u62a4\u4e0b\u8bfb\u53d6\u76f8\u540c\u7684 ireq-&gt;ireq_opt\u3002<\/li>\n<li>UAF \u89e6\u53d1&#xff1a;\u5f53\u65b0\u5efa\u7acb\u7684\u5b50\u5957\u63a5\u5b57\u7531\u4e8e\u67d0\u79cd\u539f\u56e0\u88ab\u8fc5\u901f\u9500\u6bc1\u65f6&#xff0c;\u7531\u4e8e TCP \u5b50\u5957\u63a5\u5b57\u4e0d\u5177\u5907 SOCK_RCU_FREE \u673a\u5236&#xff0c;\u5176\u6790\u6784\u51fd\u6570 inet_sock_destruct() \u4f1a\u901a\u8fc7\u666e\u901a\u7684 kfree() \u76f4\u63a5\u91ca\u653e inet_opt\u3002\u6b64\u65f6&#xff0c;\u5e76\u53d1\u8fd0\u884c\u5728\u53e6\u4e00\u4e2a CPU \u4e0a\u7684\u91cd\u4f20\/\u54cd\u5e94\u8def\u5f84\u7531\u4e8e\u8fd8\u5728\u5229\u7528\u8be5\u6307\u9488\u6784\u5efa SYNACK \u62a5\u6587&#xff0c;\u4fbf\u4f1a\u8bfb\u53d6\u5df2\u91ca\u653e\u7684\u5185\u5b58&#xff0c;\u5bfc\u81f4\u91ca\u653e\u540e\u4f7f\u7528&#xff08;UAF&#xff09;\u3002<\/li>\n<li>\u6ce8&#xff1a;IPv6 \u7531\u4e8e\u5728\u8fde\u63a5\u5efa\u7acb\u65f6\u91c7\u7528\u4e86\u6570\u636e\u62f7\u8d1d\u673a\u5236&#xff0c;\u5b8c\u5168\u4e0d\u53d7\u6b64\u6f0f\u6d1e\u5f71\u54cd\u3002<\/li>\n<\/ul>\n<h3>2. \u5f71\u54cd\u4e0e\u4fee\u590d\u7248\u672c<\/h3>\n<ul>\n<li>\u53d7\u5f71\u54cd\u7248\u672c&#xff1a;Linux Kernel 4.4 \u53ca\u4ee5\u4e0a\u6240\u6709\u672a\u4fee\u8865\u7684\u4e3b\u7ebf\u4e0e\u7a33\u5b9a\u5206\u652f\u7248\u672c\u3002<\/li>\n<li>\u4fee\u590d\u7248\u672c&#xff1a;Linux \u5185\u6838\u5b98\u65b9\u5df2\u4e8e 2026 \u5e74 10 \u6708\u521d\u5408\u5e76\u4e86\u4e0a\u6e38\u8865\u4e01&#xff0c;\u901a\u8fc7\u5f3a\u5236\u5c06 IP \u9009\u9879\u7684\u91ca\u653e\u5ef6\u540e\u5230 RCU \u5bbd\u9650\u671f&#xff08;Grace Period&#xff09;\u4e4b\u540e\u6765\u6d88\u9664\u7ade\u4e89\u3002\u5df2\u4fee\u590d\u7684\u5b89\u5168\u7a33\u5b9a\u7248\u672c\u5305\u62ec&#xff1a;\n<ul>\n<li>Linux 5.10.272 \u53ca\u4ee5\u4e0a<\/li>\n<li>Linux 5.15.223 \u53ca\u4ee5\u4e0a<\/li>\n<li>Linux 6.1.190 \u53ca\u4ee5\u4e0a<\/li>\n<li>Linux 6.6.159 \u53ca\u4ee5\u4e0a<\/li>\n<li>Linux 6.12.113 \u53ca\u4ee5\u4e0a<\/li>\n<li>Linux 6.18.56 \u53ca\u4ee5\u4e0a<\/li>\n<li>Linux 7.2.10 \u4e0e 7.3<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>3. PoC \u6982\u5ff5\u9a8c\u8bc1\u4e0e\u6280\u672f\u903b\u8f91<\/h3>\n<p>\u57fa\u4e8e\u5b89\u5168\u4e0e\u5408\u89c4\u539f\u5219&#xff0c;\u6b64\u5904\u4e0d\u63d0\u4f9b\u53ef\u76f4\u63a5\u7528\u4e8e\u5b9e\u9645\u7f51\u7edc\u653b\u51fb\u7684\u6b66\u5668\u5316 RCE \u6f0f\u6d1e\u5229\u7528\u811a\u672c&#xff0c;\u4f46\u53ef\u4ee5\u63d0\u4f9b\u89e6\u53d1\u8be5\u7ade\u6001\u6761\u4ef6\u7684\u6280\u672f\u903b\u8f91\u4e0e\u6982\u5ff5\u9a8c\u8bc1\u673a\u7406\u3002\u6839\u636e\u8cc7\u5b89\u6a5f\u69cb\u7684\u5206\u6790&#xff0c;\u8981\u6210\u529f\u89e6\u53d1\u6b64 UAF \u72b6\u6001&#xff0c;\u6982\u5ff5\u9a8c\u8bc1\u4ee3\u7801&#xff08;PoC&#xff09;\u4e3b\u8981\u56f4\u7ed5\u4ee5\u4e0b\u7f51\u7edc\u884c\u4e3a\u5c55\u5f00&#xff1a;<\/p>\n<h4>\u89e6\u53d1\u6d41\u7a0b\u673a\u7406<\/h4>\n<li>\u76ee\u6807\u524d\u7f6e\u6761\u4ef6&#xff1a;\u76ee\u6807\u670d\u52a1\u5668\u66b4\u9732\u4e86\u5f00\u542f\u591a\u8def\u5f84 TCP&#xff08;MPTCP&#xff09;\u76d1\u542c\u7684 IPv4 \u7aef\u53e3\u3002<\/li>\n<li>\u7b2c\u4e00\u6b65&#xff08;\u53d1\u9001\u5e26\u9009\u9879\u7684 SYN&#xff09;&#xff1a;PoC \u5411\u76ee\u6807\u7aef\u53e3\u53d1\u9001\u4e00\u4e2a\u5e26\u6709\u7279\u5b9a IPv4 \u9009\u9879&#xff08;\u4f8b\u5982 Record Route \u8bb0\u5f55\u8def\u7531 \u6216 Timestamp \u65f6\u95f4\u6233&#xff09;\u7684\u6076\u610f TCP SYN \u62a5\u6587\u3002<\/li>\n<li>\u7b2c\u4e8c\u6b65&#xff08;\u5236\u9020\u9ad8\u9891\u5e76\u53d1\u7ade\u4e89&#xff09;&#xff1a;\u5229\u7528\u5feb\u901f\u8fde\u7eed\u91cd\u53d1\u7684 SYN \u62a5\u6587&#xff08;\u6216\u901a\u8fc7\u5f15\u53d1\u5957\u63a5\u5b57\u8fc1\u79fb&#xff09;&#xff0c;\u8feb\u4f7f\u76ee\u6807\u7684\u591a\u4e2a CPU \u6838\u5fc3\u540c\u65f6\u4ecb\u5165&#xff1a;\n<ul>\n<li>\u6838\u5fc3 A \u6b63\u5728\u57fa\u4e8e\u524d\u4e00\u4e2a\u8bf7\u6c42\u8c03\u7528 tcp_v4_syn_recv_sock() \u79fb\u4ea4\u5957\u63a5\u5b57\u6240\u6709\u6743\u5e76\u56e0\u67d0\u4e9b\u6a21\u62df\u5f02\u5e38\u5feb\u901f\u91ca\u653e\u3002<\/li>\n<li>\u6838\u5fc3 B \u6070\u597d\u5728\u76f8\u540c\u5fae\u79d2\u7ea7\u7a97\u53e3\u5185\u8bfb\u53d6\u8be5\u8bf7\u6c42\u4ee5\u5904\u7406\u91cd\u4f20\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u7b2c\u4e09\u6b65&#xff08;\u4fe1\u606f\u6cc4\u9732\u4e0e\u63a7\u5236\u6d41\u52ab\u6301&#xff09;&#xff1a;\n<ul>\n<li>\u7ade\u6001\u5931\u8d25\u65f6&#xff0c;\u901a\u5e38\u4ec5\u4f1a\u5bfc\u81f4\u5355\u6b21 TCP \u8fde\u63a5\u65ad\u5f00\u6216\u5931\u8d25&#xff0c;\u7cfb\u7edf\u4e0d\u4f1a\u76f4\u63a5\u5185\u6838\u5d29\u6e83&#xff08;Panic&#xff09;&#xff0c;\u8fd9\u5141\u8bb8 PoC \u5728\u6570\u5341\u949f\u5185\u8fdb\u884c\u4e0d\u95f4\u65ad\u7684\u66b4\u529b\u5c1d\u8bd5&#xff08;Brute-force&#xff09;\u3002<\/li>\n<li>\u6210\u529f\u89e6\u53d1 UAF \u540e&#xff0c;\u7b2c\u4e00\u9636\u6bb5\u5229\u7528\u8be5\u6b8b\u7559\u6307\u9488\u8bfb\u53d6\u8d8a\u754c\u5185\u6838\u6570\u636e&#xff0c;\u4ece\u800c\u7ed5\u8fc7 KASLR&#xff08;\u5185\u6838\u5730\u5740\u7a7a\u95f4\u968f\u673a\u5316&#xff09;\u3002<\/li>\n<li>\u7b2c\u4e8c\u9636\u6bb5\u5728\u91ca\u653e\u7684\u5185\u5b58\u69fd\u4f4d\u4e0a\u586b\u5165\u4f2a\u9020\u7ed3\u6784\u4f53&#xff0c;\u6539\u5199\u5185\u6838\u7684\u51fd\u6570\u56de\u8c03\u6307\u9488&#xff08;Callback Pointer&#xff09;&#xff0c;\u6700\u7ec8\u5b9e\u73b0\u672a\u6388\u6743\u7684\u8fdc\u7a0b root \u6743\u9650\u547d\u4ee4\u6267\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n<h3>4. \u4e34\u65f6\u7f13\u89e3\u63aa\u65bd<\/h3>\n<p>\u7531\u4e8e\u90e8\u5206\u4e3b\u6d41\u4f01\u4e1a\u7ea7\u53d1\u884c\u7248&#xff08;\u5982 Ubuntu \u5b89\u5168\u56e2\u961f \u4e0e Red Hat&#xff09;\u5728\u53d1\u5e03\u521d\u671f\u4fee\u8865\u8fdb\u5ea6\u8f83\u6162&#xff0c;\u7cfb\u7edf\u7ba1\u7406\u5458\u53ef\u91c7\u53d6\u4ee5\u4e0b\u4e34\u65f6\u7f13\u89e3\u624b\u6bb5&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u7f51\u7edc\u5c42\u8fc7\u6ee4&#xff1a;\u4f7f\u7528 nftables \u6216\u9ad8\u7ea7\u9632\u706b\u5899\u89c4\u5219&#xff0c;\u76f4\u63a5\u4e22\u5f03\u5305\u542b IPv4 \u9009\u9879\u5934&#xff08;Options&#xff09;\u7684\u5f02\u5e38\u5916\u7f51 TCP \u63e1\u624b\u62a5\u6587\u3002<\/p>\n<ul>\n<li>\u4f7f\u7528 nftables\u4e34\u65f6\u6dfb\u52a0\u89c4\u5219&#xff08;\u4e22\u5f03\u5e26\u6709\u4efb\u610f IPv4 \u9009\u9879\u7684 TCP SYN \u62a5\u6587&#xff09;&#xff1a; sudo nft add rule ip filter INPUT ip ihl &gt; 5 tcp flags syn drop<\/li>\n<li>\u4fdd\u5b58\u89c4\u5219&#xff1a; ip ihl &gt; 5 tcp flags syn drop<\/li>\n<li>\u968f\u540e\u91cd\u542f\u670d\u52a1&#xff1a; sudo systemctl restart nftables<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5173\u95ed\u4e0d\u5fc5\u8981\u7684 MPTCP \u76d1\u542c&#xff1a;\u5982\u679c\u4e1a\u52a1\u4e0d\u9700\u8981\u591a\u8def\u5f84 TCP \u529f\u80fd&#xff0c;\u5e94\u6682\u65f6\u5173\u95ed\u5bf9\u5e94\u7684\u76d1\u542c\u5957\u63a5\u5b57\u4ee5\u963b\u65ad\u9ad8\u5371\u653b\u51fb\u8def\u5f84\u3002<\/p>\n<ul>\n<li>\u4e34\u65f6\u5173\u95ed&#xff08;\u7acb\u5373\u751f\u6548&#xff0c;\u91cd\u542f\u5931\u6548&#xff09;&#xff1a; sudo sysctl -w net.mptcp.enabled&#061;0<\/li>\n<li>\n<p>\u6c38\u4e45\u7981\u7528 MPTCP \u534f\u8bae&#xff08;\u91cd\u542f\u4f9d\u7136\u6709\u6548&#xff09;&#xff1a; echo &#034;net.mptcp.enabled &#061; 0&#034; | sudo tee -a \/etc\/sysctl.d\/99-disable-mptcp.conf sudo sysctl &#8211;system<\/p>\n<\/li>\n<li>\n<p>\u68c0\u67e5\u7cfb\u7edf\u4e0a\u7684 MPTCP \u76d1\u542c\u72b6\u6001&#xff1a; ss -Mln<\/p>\n<\/li>\n<li>\u5f7b\u5e95\u5378\u8f7d\/\u7981\u7528 MPTCP \u5185\u6838\u6a21\u5757&#xff1a; echo &#034;blacklist mptcp&#034; | sudo tee -a \/etc\/modprobe.d\/blacklist-mptcp.conf<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>CVE-2026-98432 \u6f0f\u6d1e\u8be6\u89e3CVE-2026-98432 \u5f15\u5165\u4e86 Linux \u5185\u6838 IPv4 TCP \u534f\u8bae\u6808\u4e2d\u4e00\u4e2a\u4e25\u91cd\u7684\u201c\u91ca\u653e\u540e\u4f7f\u7528\u201d&#xff08;Use-After-Free, UAF&#xff09;\u7ade\u6001\u6761\u4ef6\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u7684\u5b98\u65b9 CVSS \u8bc4\u5206\u9ad8\u8fbe 9.8&#xff08;\u4e25\u91cd\u7b49\u7ea7&#xff09;\u3002\u5b83\u5728 2026 \u5e74 10 \u6708\u4e2d\u65ec\u88ab\u516c\u5f00\u62ab\u9732&#xff0c;\u5e76\u5728\u5b89\u5168\u9886\u57df\u5f15\u53d1\u4e86\u5de8\u5927\u9707\u52a8&#xff0c;\u56e0\u4e3a AI 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