{"id":2876,"date":"2026-05-01T00:33:37","date_gmt":"2026-04-30T16:33:37","guid":{"rendered":"https:\/\/airy.cn\/WordPress\/?p=2876"},"modified":"2026-05-01T00:33:37","modified_gmt":"2026-04-30T16:33:37","slug":"%e7%b4%a7%e6%80%a5%e9%a2%84%e8%ad%a6%ef%bd%9clinux%e5%8f%b2%e8%af%97%e7%ba%a7%e6%8f%90%e6%9d%83%e6%bc%8f%e6%b4%9ecopy-fail%e6%9b%9dcve-2026-31431%e6%bc%8f%e6%b4%9e%e5%85%81%e8%ae%b8%e4%bd%8e%e6%9d%83","status":"publish","type":"post","link":"https:\/\/airy.cn\/WordPress\/?p=2876","title":{"rendered":"\u7d27\u6025\u9884\u8b66\uff5cLinux\u53f2\u8bd7\u7ea7\u63d0\u6743\u6f0f\u6d1eCopy Fail\u66ddCVE-2026-31431\u6f0f\u6d1e\u5141\u8bb8\u4f4e\u6743\u9650\u7528\u6237\u901a\u8fc7Python\u811a\u672c\u83b7\u53d6root\u6743\u9650"},"content":{"rendered":"\n

\u7d27\u6025\u9884\u8b66\uff5cLinux\u53f2\u8bd7\u7ea7\u63d0\u6743\u6f0f\u6d1eCopy Fail\u66dd
CVE-2026-31431\u6f0f\u6d1e\u5141\u8bb8\u4f4e\u6743\u9650\u7528\u6237\u901a\u8fc7Python\u811a\u672c\u83b7\u53d6root\u6743\u9650\uff0c\u5f71\u54cd\u5e7f\u6cdb\u3002\u5efa\u8bae\u7acb\u5373\u66f4\u65b0\u5185\u6838\u6216\u7981\u7528\u76f8\u5173\u6a21\u5757\uff0c\u786e\u4fdd\u7cfb\u7edf\u5b89\u5168\u3002<\/p>\n\n\n\n

Linux Kernel \u88ab\u62ab\u9732\u5176\u5b58\u5728\u672c\u5730\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\uff0c\u6f0f\u6d1e\u7f16\u53f7CVE-2026-31431\uff0c\u4ee3\u53f7 \u201cCopy Fail\u201d\u3002\u53ef\u5bfc\u81f4\u672c\u5730\u4f4e\u6743\u9650\u653b\u51fb\u8005\u5229\u7528 AF_ALG \u52a0\u5bc6\u63a5\u53e3\u4e0e splice() \u7cfb\u7edf\u8c03\u7528\uff0c\u5b9e\u73b0\u5411\u4efb\u610f\u53ef\u8bfb\u6587\u4ef6\u7684\u9875\u7f13\u5b58\u4e2d\u5199\u5165\u53d7\u63a7\u76844\u5b57\u8282\u6570\u636e\uff0c\u8fdb\u800c\u901a\u8fc7\u7be1\u6539 setuid \u4e8c\u8fdb\u5236\u6587\u4ef6\u83b7\u5f97 root \u6743\u9650\u7b49\u5371\u5bb3\u3002\u4e3a\u907f\u514d\u60a8\u7684\u4e1a\u52a1\u53d7\u5f71\u54cd\uff0c\u817e\u8baf\u4e91\u5b89\u5168\u5efa\u8bae\u60a8\u53ca\u65f6\u5f00\u5c55\u5b89\u5168\u81ea\u67e5\uff0c\u5982\u5728\u53d7\u5f71\u54cd\u8303\u56f4\uff0c\u8bf7\u60a8\u53ca\u65f6\u8fdb\u884c\u66f4\u65b0\u4fee\u590d\uff0c\u907f\u514d\u88ab\u5916\u90e8\u653b\u51fb\u8005\u5165\u4fb5\u3002\u6f0f\u6d1e\u8be6\u60c5Linux Kernel \u662f\u5168\u7403\u6700\u5e7f\u6cdb\u4f7f\u7528\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\uff0c\u5b83\u662f Linux \u7cfb\u7edf\u7684\u6838\u5fc3\u7ec4\u4ef6\uff0c\u8d1f\u8d23\u7ba1\u7406\u786c\u4ef6\u8d44\u6e90\u3001\u8fdb\u7a0b\u8c03\u5ea6\u3001\u5185\u5b58\u7ba1\u7406\u3001\u6587\u4ef6\u7cfb\u7edf\u548c\u7f51\u7edc\u529f\u80fd\u7b49\u5e95\u5c42\u4efb\u52a1\u3002\u636e\u63cf\u8ff0\uff0c\u5728 Linux \u5185\u6838\u7684 authencesn \u52a0\u5bc6\u6a21\u677f\u4e0e algif_aead \u6a21\u5757\u7684\u7ec4\u5408\u5b9e\u73b0\u4e2d\uff0c\u7531\u4e8e AF_ALG \u5957\u63a5\u5b57\u7684 AEAD \u89e3\u5bc6\u8def\u5f84\u5728 2017 \u5e74\u5f15\u5165\u4e86\u4e00\u4e2a\u5c31\u5730\uff08in-place\uff09\u64cd\u4f5c\u4f18\u5316\uff08\u63d0\u4ea4 72548b093ee3\uff09\uff0c\u5c06 splice() \u4f20\u9012\u8fc7\u6765\u7684\u76ee\u6807\u6587\u4ef6\u9875\u7f13\u5b58\u9875\u9762\u76f4\u63a5\u94fe\u5165\u53ef\u5199\u7684\u8f93\u51fa\u6563\u5217\u8868\uff08scatterlist\uff09\u3002\u800c authencesn \u7b97\u6cd5\u5728\u5b9e\u73b0 IPsec \u6269\u5c55\u5e8f\u5217\u53f7\uff08ESN\uff09\u652f\u6301\u65f6\uff0c\u4e3a\u4e86\u91cd\u6392\u8ba4\u8bc1\u6570\u636e\u4e2d\u7684\u5e8f\u5217\u53f7\u5b57\u8282\uff0c\u4f1a\u5728\u89e3\u5bc6\u8fc7\u7a0b\u4e2d\u5c06\u63a5\u6536\u7f13\u51b2\u533a\u504f\u79fb assoclen + cryptlen \u4f4d\u7f6e\u4f5c\u4e3a\u4e34\u65f6\u5b58\u50a8\u7a7a\u95f4\u5199\u5165 4 \u5b57\u8282\u6570\u636e\u3002\u5f53 AF_ALG \u901a\u8fc7 recvmsg() \u89e6\u53d1\u89e3\u5bc6\u64cd\u4f5c\u65f6\uff0c\u8be5\u5199\u5165\u4f1a\u8de8\u8d8a\u63a5\u6536\u7f13\u51b2\u533a\u8fb9\u754c\uff0c\u76f4\u63a5\u8986\u76d6\u94fe\u5728\u540e\u9762\u7684\u9875\u7f13\u5b58\u9875\u9762\uff0c\u4ece\u800c\u5b9e\u73b0\u5bf9\u4efb\u610f\u5df2\u6253\u5f00\u7684\u53ef\u8bfb\u6587\u4ef6\u7684\u9875\u7f13\u5b58\u8fdb\u884c\u53d7\u63a7\u7684 4 \u5b57\u8282\u7be1\u6539\uff0c\u6700\u7ec8\u5bfc\u81f4\u672c\u5730\u4f4e\u6743\u9650\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u7be1\u6539\u7cfb\u7edf\u4e0a\u4efb\u610f\u53ef\u8bfb\u6587\u4ef6\uff08\u5982 \/usr\/bin\/su \u7b49 setuid \u7a0b\u5e8f\uff09\u7684\u9875\u7f13\u5b58\u5185\u5bb9\uff0c\u65e0\u9700\u7ade\u4e89\u6761\u4ef6\u6216\u91cd\u8bd5\u5373\u53ef\u76f4\u63a5\u83b7\u5f97 root \u6743\u9650\uff0c\u4e14\u8be5\u5199\u5165\u4e0d\u4f1a\u89e6\u53d1\u78c1\u76d8\u810f\u9875\u56de\u5199\uff0c\u53ef\u5b9e\u73b0\u6301\u4e45\u5316\u63d0\u6743\u7b49\u5371\u5bb3\u3002\u76ee\u524d\u8be5\u6f0f\u6d1e\u7684\u6f0f\u6d1e\u7ec6\u8282\u3001POC\u5df2\u516c\u5f00\u3002\u98ce\u9669\u7b49\u7ea7\u9ad8\u98ce\u9669\u6f0f\u6d1e\u98ce\u9669\u672c\u5730\u653b\u51fb\u8005\u5229\u7528\u8be5\u6f0f\u6d1e\u53ef\u5728\u65e0\u9700\u7ade\u4e89\u6761\u4ef6\u3001\u65e0\u9700\u91cd\u8bd5\u7684\u60c5\u51b5\u4e0b\uff0c\u901a\u8fc7\u7be1\u6539\u7cfb\u7edf\u4e0a\u4efb\u610f\u53ef\u8bfb\u6587\u4ef6\uff08\u5982 \/usr\/bin\/su \u7b49 setuid \u7a0b\u5e8f\uff09\u7684\u9875\u7f13\u5b58\u5185\u5bb9\uff0c\u76f4\u63a5\u83b7\u5f97 root \u6743\u9650\uff0c\u4e14\u8be5\u5199\u5165\u4e0d\u4f1a\u89e6\u53d1\u78c1\u76d8\u810f\u9875\u56de\u5199\uff0c\u53ef\u5b9e\u73b0\u6301\u4e45\u5316\u63d0\u6743\u7b49\u5371\u5bb3\u3002\u5f71\u54cd\u7248\u672c72548b093ee3 <= commit < a664bf3d603d\u76ee\u524d\u5df2\u77e5\u53d7\u5f71\u54cd\u64cd\u4f5c\u7cfb\u7edf\u53ca\u7248\u672c\uff1aUbuntu 25.10Ubuntu 24.04 LTSUbuntu 22.04 LTSUbuntu 20.04 LTSUbuntu 18.04 LTSAmazon Linux 2023Red Hat Enterprise Linux 10Red Hat Enterprise Linux 9Red Hat Enterprise Linux 8SUSE 16\u5b89\u5168\u7248\u672ccommit >= a664bf3d603d\u6392\u67e5\u65b9\u6cd5# \u68c0\u67e5\u5185\u6838\u7248\u672cuname -r# \u68c0\u67e5\u5185\u6838\u914d\u7f6e\u662f\u5426\u542f\u7528\uff08\u63a8\u8350\uff09grep CONFIG_CRYPTO_USER_API_AEAD \/boot\/config-$(uname -r)\u6ce8\uff1a\u4f1a\u51fa\u73b0\u4ee5\u4e0b\u4e09\u79cd\u60c5\u51b5\uff1aCONFIG_CRYPTO_USER_API_AEAD=n \u5f7b\u5e95\u5173\u95ed\uff0c\u4e0d\u53d7\u5f71\u54cd\uff0c\u65e0\u9700\u5904\u7406CONFIG_CRYPTO_USER_API_AEAD=y \u9759\u6001\u7f16\u8bd1\u8fdb\u5185\u6838\uff0cIsmod \u67e5\u4e0d\u5230\uff0c\u4f46\u53d7\u5f71\u54cd\uff0c\u6682\u65e0\u7f13\u89e3\u63aa\u65bd\uff0c\u53ea\u80fd\u5347\u7ea7\u5185\u6838\uff08\u4f8b\u5982\uff1aRHEL\/CentOS\/Rocky Linux\/AlmaLinux 8, 9, 10 \u4e09\u4ee3\u4ea7\u54c1\uff09CONFIG_CRYPTO_USER_API_AEAD=m \u6a21\u5757\u65b9\u5f0f\uff0cIsmod \u53ef\u67e5\uff0c\u52a0\u8f7d\u5c31\u6709\u98ce\u9669\uff0c\u53d7\u5f71\u54cd\uff0c\u53ef\u901a\u8fc7\u4ee5\u4e0b\u7f13\u89e3\u63aa\u65bd\u7f13\u89e3# \u68c0\u67e5\u6a21\u5757\u662f\u5426\u5df2\u52a0\u8f7d\u53d7\u5f71\u54cd\u6a21\u5757lsmod | grep algif# \u68c0\u67e5 AF_ALG socket \u662f\u5426\u53ef\u521b\u5efapython3 -c “import socket; socket.socket(38,5,0); print(‘VULNERABLE’)”\u4fee\u590d\u5efa\u8bae1. \u5b98\u65b9\u5df2\u53d1\u5e03\u6f0f\u6d1e\u8865\u4e01\u53ca\u4fee\u590d\u7248\u672c\uff0c\u8bf7\u8bc4\u4f30\u4e1a\u52a1\u662f\u5426\u53d7\u5f71\u54cd\u540e\uff0c\u5347\u7ea7\u81f3\u5b89\u5168\u7248\u672chttps:\/\/git.kernel.org\/stable\/c\/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a52. \u9488\u5bf9 Ubuntu\u3001Debian\u3001RHEL\/CentOS\u3001SUSE \u7b49\u7528\u6237\uff0c\u5b98\u65b9\u6682\u672a\u53d1\u5e03\u5b89\u5168\u66f4\u65b0\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u5b98\u65b9\u5b89\u5168\u516c\u544a\uff1aUbuntu\uff1ahttps:\/\/ubuntu.com\/security\/CVE-2026-31431Debian\uff1ahttps:\/\/security-tracker.debian.org\/tracker\/CVE-2026-31431RHEL\/CentOS\uff1ahttps:\/\/access.redhat.com\/security\/cve\/cve-2026-31431SUSE\uff1ahttps:\/\/www.suse.com\/security\/cve\/CVE-2026-31431.html3. \u7f13\u89e3\u63aa\u65bd\uff1a# \u7981\u7528\u5185\u6838\u6a21\u5757echo “install algif_aead \/bin\/false” > \/etc\/modprobe.d\/disable-algif-aead.conf# \u5378\u8f7d\u5df2\u52a0\u8f7d\u6a21\u5757rmmod algif_aead 2>\/dev\/null\u6ce8\uff1a\u9488\u5bf9\u9759\u6001\u7f16\u8bd1\u8fdb\u5185\u6838\u7684\u7cfb\u7edf\uff08\u4f8b\u5982\uff1aRHEL\/CentOS\/Rocky Linux\/AlmaLinux 8, 9, 10 \u4e09\u4ee3\u4ea7\u54c1\uff09\uff0c\u6b64\u7f13\u89e3\u63aa\u65bd\u53ef\u80fd\u65e0\u6cd5\u751f\u6548\uff0c\u5efa\u8bae\u66f4\u65b0\u5b98\u65b9\u5185\u6838\u8865\u4e01\u3002# \u9a8c\u8bc1python3 -c ‘import socket; s=socket.socket(38,5,0); (s.bind((“aead”, “authencesn(hmac(sha256),cbc(aes))”)) or print(“\u672a\u7f13\u89e3”)) if s else None’ 2>\/dev\/null || echo “\u5df2\u7f13\u89e3”4. \u5bb9\u5668\u73af\u5883\u52a0\u56fa\u901a\u8fc7 seccomp \u7981\u6b62 AF_ALG socket \u521b\u5efa\uff08family=38\uff09\uff1a”syscalls”: [{ “names”: [“socket”], “action”: “SCMP_ACT_ERRNO”, “args”: [{“index”: 0, “value”: 38, “op”: “SCMP_CMP_EQ”}]}]\u3010\u5907\u6ce8\u3011\uff1a\u5efa\u8bae\u60a8\u5728\u5347\u7ea7\u524d\u505a\u597d\u6570\u636e\u5907\u4efd\u5de5\u4f5c\uff0c\u907f\u514d\u51fa\u73b0\u610f\u5916\u6f0f\u6d1e\u53c2\u8003https:\/\/copy.fail\/https:\/\/xint.io\/blog\/copy-fail-linux-distributionshttps:\/\/github.com\/theori-io\/copy-fail-CVE-2026-31431\/https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2026-31431<\/p>\n","protected":false},"excerpt":{"rendered":"

\u7d27\u6025\u9884\u8b66\uff5cLinux\u53f2\u8bd7\u7ea7\u63d0\u6743\u6f0f\u6d1eCopy Fail\u66ddCVE-2026-31431\u6f0f\u6d1e\u5141\u8bb8\u4f4e\u6743\u9650\u7528\u6237\u901a\u8fc7Pyt … \u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kadence_starter_templates_imported_post":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-2876","post","type-post","status-publish","format-standard","hentry","category-airy-tech"],"_links":{"self":[{"href":"https:\/\/airy.cn\/WordPress\/index.php?rest_route=\/wp\/v2\/posts\/2876","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/airy.cn\/WordPress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/airy.cn\/WordPress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/airy.cn\/WordPress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/airy.cn\/WordPress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2876"}],"version-history":[{"count":1,"href":"https:\/\/airy.cn\/WordPress\/index.php?rest_route=\/wp\/v2\/posts\/2876\/revisions"}],"predecessor-version":[{"id":2877,"href":"https:\/\/airy.cn\/WordPress\/index.php?rest_route=\/wp\/v2\/posts\/2876\/revisions\/2877"}],"wp:attachment":[{"href":"https:\/\/airy.cn\/WordPress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2876"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/airy.cn\/WordPress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2876"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/airy.cn\/WordPress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2876"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}