{"id":134101,"date":"2026-04-30T10:54:29","date_gmt":"2026-04-30T01:54:29","guid":{"rendered":"https:\/\/softantenna.com\/blog\/?p=134101"},"modified":"2026-04-30T10:54:29","modified_gmt":"2026-04-30T01:54:29","slug":"linux-vulnerability-copy-fail","status":"publish","type":"post","link":"https:\/\/softantenna.com\/blog\/linux-vulnerability-copy-fail\/","title":{"rendered":"Linux\u3092\u63fa\u308b\u304c\u3059\u8106\u5f31\u6027\u300cCopy Fail\u300d\u304c\u767a\u898b\u3002\u308f\u305a\u304b732\u30d0\u30a4\u30c8\u3067root\u6a29\u9650\u304c\u596a\u53d6\u3055\u308c\u308b\u885d\u6483"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/softantenna.com\/blog\/wp-content\/uploads\/2026\/04\/copyfail.webp\" alt=\"\" width=\"1200\" height=\"630\" class=\"aligncenter size-full wp-image-134102\" \/><\/p>\n<p>Linux\u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u306e\u6839\u5e79\u3092\u63fa\u308b\u304c\u3059\u65b0\u305f\u306a\u8106\u5f31\u6027\u304c\u5831\u544a\u3055\u308c\u307e\u3057\u305f\u3002<a href=\"https:\/\/xint.io\/blog\/copy-fail-linux-distributions\">Xint Code\u304c\u516c\u958b<\/a>\u3057\u305f\u65b0\u3057\u3044\u8106\u5f31\u6027\u3001\u901a\u79f0\u300cCopy Fail(CVE-2026-31431)\u300d\u306f\u3001\u308f\u305a\u304b732\u30d0\u30a4\u30c8\u306e\u77ed\u3044Python\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u5b9f\u884c\u3059\u308b\u3060\u3051\u3067\u3001\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\u304c\u6700\u9ad8\u6a29\u9650(root)\u3092\u596a\u53d6\u3067\u304d\u308b\u3068\u3044\u3046\u885d\u6483\u306e\u5185\u5bb9\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Ubuntu\u3001RHEL\u3001Amazon Linux\u3001SUSE\u3068\u3044\u3063\u305f\u4e3b\u8981\u306a\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\u306e\u3059\u3079\u3066\u304c\u5f71\u97ff\u3092\u53d7\u3051\u30012017\u5e74\u4ee5\u964d\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u305f\u307b\u307c\u3059\u3079\u3066\u306e\u30b7\u30b9\u30c6\u30e0\u3067\u60aa\u7528\u304c\u53ef\u80fd\u3068\u3044\u3046\u3001\u6975\u3081\u3066\u5e83\u7bc4\u56f2\u304b\u3064\u5371\u967a\u306a\u30d0\u30b0\u3068\u3057\u3066\u6ce8\u76ee\u3092\u96c6\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u8106\u5f31\u6027\u306e\u6838\u5fc3\uff1a\u30da\u30fc\u30b8\u30ad\u30e3\u30c3\u30b7\u30e5\u3078\u306e\u4fb5\u5165<\/h2>\n<p>\u3053\u306e\u554f\u984c\u306e\u6839\u672c\u7684\u306a\u539f\u56e0\u306f\u3001Linux\u30ab\u30fc\u30cd\u30eb\u306e\u6697\u53f7\u5316\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0(AF_ALG)\u3068\u3001\u30c7\u30fc\u30bf\u3092\u52b9\u7387\u7684\u306b\u8ee2\u9001\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3042\u308b<code>splice()<\/code>\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u901a\u5e38\u3001Linux\u3067\u306f\u30d5\u30a1\u30a4\u30eb\u306e\u8aad\u307f\u8fbc\u307f\u3092\u9ad8\u901f\u5316\u3059\u308b\u305f\u3081\u306b\u3001\u30c7\u30a3\u30b9\u30af\u4e0a\u306e\u30c7\u30fc\u30bf\u3092\u30e1\u30e2\u30ea(\u30da\u30fc\u30b8\u30ad\u30e3\u30c3\u30b7\u30e5)\u306b\u4fdd\u6301\u3057\u307e\u3059\u3002<code>splice()<\/code>\u306f\u3053\u306e\u30da\u30fc\u30b8\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u76f4\u63a5\u53c2\u7167\u3057\u3066\u30c7\u30fc\u30bf\u3092\u8ee2\u9001\u3057\u307e\u3059\u304c\u3001\u300cCopy Fail\u300d\u3067\u306f\u3053\u306e\u4ed5\u7d44\u307f\u3092\u60aa\u7528\u3057\u3001\u672c\u6765\u8aad\u307f\u53d6\u308a\u5c02\u7528\u3067\u3042\u308b\u306f\u305a\u306e\u3001\u30d5\u30a1\u30a4\u30eb\u306b\u5bfe\u5fdc\u3059\u308b\u30e1\u30e2\u30ea\u9818\u57df\u3092\u3001\u66f8\u304d\u8fbc\u307f\u53ef\u80fd\u306a\u72b6\u614b\u3067\u6697\u53f7\u5316\u51e6\u7406\u306e\u30d0\u30c3\u30d5\u30a1\u3068\u3057\u3066\u6271\u308f\u305b\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<p>\u7279\u5b9a\u306e\u6697\u53f7\u5316\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8(authencesn)\u304c\u3001\u51e6\u7406\u4e2d\u306b\u4f5c\u696d\u7528\u9818\u57df\u3068\u3057\u3066\u3053\u306e\u30d0\u30c3\u30d5\u30a1\u306e\u672b\u5c3e4\u30d0\u30a4\u30c8\u3092\u4e0a\u66f8\u304d\u3057\u3066\u3057\u307e\u3046\u4ed5\u69d8\u306b\u306a\u3063\u3066\u3044\u3066\u3001\u3053\u306e\u300c\u610f\u56f3\u3057\u306a\u30444\u30d0\u30a4\u30c8\u306e\u66f8\u304d\u8fbc\u307f\u300d\u304c\u3001\u7279\u6a29\u6607\u683c\u306e\u30c8\u30ea\u30ac\u30fc\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u300cCopy Fail\u300d\u304c\u904e\u53bb\u306e\u8106\u5f31\u6027\u3068\u4e00\u7dda\u3092\u753b\u3059\u306e\u306f\u3001\u300c\u78ba\u5b9f\u6027\u300d\u3068\u300c\u96a0\u5bc6\u6027\u300d\u306e\u9ad8\u3055\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\n<p><b>\u6210\u529f\u7387100%\u306e\u5b89\u5b9a\u6027<\/b><br \/>\n\u904e\u53bb\u306b\u6709\u540d\u306b\u306a\u3063\u305f\u300cDirty COW\u300d\u306a\u3069\u306e\u8106\u5f31\u6027\u306f\u3001\u30bf\u30a4\u30df\u30f3\u30b0\u306b\u4f9d\u5b58\u3059\u308b\u30ec\u30fc\u30b9\u30b3\u30f3\u30c7\u30a3\u30b7\u30e7\u30f3\uff08\u7af6\u5408\u72b6\u614b\uff09\u3092\u5229\u7528\u3059\u308b\u305f\u3081\u3001\u653b\u6483\u306b\u5931\u6557\u3057\u305f\u308a\u30b7\u30b9\u30c6\u30e0\u3092\u30af\u30e9\u30c3\u30b7\u30e5\u3055\u305b\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u4eca\u56de\u306e\u30d0\u30b0\u306f\u30ed\u30b8\u30c3\u30af\u305d\u306e\u3082\u306e\u306e\u6b20\u9665\u3067\u3042\u308b\u305f\u3081\u3001\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u5b9f\u884c\u3059\u308c\u3070\u78ba\u5b9f\u306b\u3001\u304b\u3064\u4e00\u77ac\u3067\u653b\u6483\u304c\u5b8c\u4e86\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><b>\u691c\u77e5\u3092\u9003\u308c\u308b\u30b9\u30c6\u30eb\u30b9\u6027<\/b><br \/>\n\u3053\u306e\u653b\u6483\u306b\u3088\u308b\u66f8\u304d\u8fbc\u307f\u306f\u30e1\u30e2\u30ea\u4e0a\u306e\u30da\u30fc\u30b8\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u5bfe\u3057\u3066\u306e\u307f\u884c\u308f\u308c\u3001\u30c7\u30a3\u30b9\u30af\u4e0a\u306e\u30d5\u30a1\u30a4\u30eb\u81ea\u4f53\u306f\u5909\u66f4\u3055\u308c\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u30cf\u30c3\u30b7\u30e5\u5024\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3088\u3046\u306a\u4e00\u822c\u7684\u306a\u6574\u5408\u6027\u78ba\u8a8d\u30c4\u30fc\u30eb\u3067\u306f\u3001\u6539\u3056\u3093\u3092\u691c\u77e5\u3059\u308b\u3053\u3068\u304c\u4e0d\u53ef\u80fd\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u30b7\u30b9\u30c6\u30e0\u304c\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3059\u308b\u969b\u306f\u30e1\u30e2\u30ea\u4e0a\u306e\u30c7\u30fc\u30bf\uff08\u6c5a\u67d3\u3055\u308c\u305f\u30da\u30fc\u30b8\u30ad\u30e3\u30c3\u30b7\u30e5\uff09\u3092\u53c2\u7167\u3059\u308b\u305f\u3081\u3001\u653b\u6483\u8005\u306froot\u6a29\u9650\u3092\u6301\u3064\u30d0\u30a4\u30ca\u30ea\u306b\u4e0d\u6b63\u306a\u30b3\u30fc\u30c9\u3092\u300c\u6ce8\u5165\u300d\u3057\u305f\u72b6\u614b\u3067\u5b9f\u884c\u3067\u304d\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><b>\u30b3\u30f3\u30c6\u30ca\u306e\u58c1\u3092\u8d8a\u3048\u308b\u5f71\u97ff\u529b<\/b><br \/>\n\u30da\u30fc\u30b8\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u30db\u30b9\u30c8OS\u5168\u4f53\u3067\u5171\u6709\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u3053\u306e\u8106\u5f31\u6027\u306f\u30b3\u30f3\u30c6\u30ca\u74b0\u5883\u306b\u304a\u3044\u3066\u3082\u6a5f\u80fd\u3057\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u4e00\u3064\u306e\u30b3\u30f3\u30c6\u30ca\u5185\u3067\u5b9f\u884c\u3055\u308c\u305f\u653b\u6483\u304c\u3001\u30db\u30b9\u30c8\u30b7\u30b9\u30c6\u30e0\u5168\u4f53\u3084\u4ed6\u306e\u30b3\u30f3\u30c6\u30ca\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u7834\u58ca\u3059\u308b\u300c\u30b3\u30f3\u30c6\u30ca\u8131\u51fa\u300d\u306e\u624b\u6bb5\u3068\u306a\u308a\u5f97\u308b\u306e\u3067\u3059\u3002<\/p>\n<\/li>\n<\/ul>\n<h2>\u4fee\u6b63\u3068\u5bfe\u7b56<\/h2>\n<p>\u3053\u306e\u6df1\u523b\u306a\u30d0\u30b0\u306e\u767a\u898b\u306b\u306fAI\u652f\u63f4\u30c4\u30fc\u30eb\u304c\u6d3b\u7528\u3055\u308c\u307e\u3057\u305f\u3002\u7814\u7a76\u8005\u304c\u300c\u6697\u53f7\u5316\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u3068\u30da\u30fc\u30b8\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u76f8\u4e92\u4f5c\u7528\u300d\u3068\u3044\u3046\u7279\u5b9a\u306e\u8996\u70b9\u3092AI\u306b\u4e0e\u3048\u3066\u30b9\u30ad\u30e3\u30f3\u3057\u305f\u7d50\u679c\u300110\u5e74\u8fd1\u304f\u6f5c\u3093\u3067\u3044\u305f\u3053\u306e\u8ad6\u7406\u7684\u6b20\u9665\u304c\u308f\u305a\u304b1\u6642\u9593\u307b\u3069\u3067\u7279\u5b9a\u3055\u308c\u305f\u3068\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u73fe\u5728\u3001\u3053\u306e\u554f\u984c\u306b\u5bfe\u3059\u308b<a href=\"https:\/\/github.com\/torvalds\/linux\/commit\/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5\">\u4fee\u6b63\u30d1\u30c3\u30c1<\/a>(AF_ALG\u306eAEAD\u51e6\u7406\u3092in-place\u65b9\u5f0f\u304b\u3089out-of-place\u65b9\u5f0f\u306b\u623b\u3059)\u306f\u3059\u3067\u306b\u516c\u958b\u3055\u308c\u3066\u304a\u308a\u3001\u4e3b\u8981\u306a\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u9069\u7528\u304c\u9032\u3093\u3067\u3044\u307e\u3059\u3002\u7ba1\u7406\u8005\u306f\u901f\u3084\u304b\u306b\u30ab\u30fc\u30cd\u30eb\u3092\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u3078\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3059\u308b\u3053\u3068\u304c\u5f37\u304f\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u5373\u6642\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u304c\u56f0\u96e3\u306a\u5834\u5408\u306e\u66ab\u5b9a\u63aa\u7f6e\u3068\u3057\u3066\u3001\u554f\u984c\u306e\u3042\u308b\u30ab\u30fc\u30cd\u30eb\u30e2\u30b8\u30e5\u30fc\u30eb(algif_aead)\u3092\u7121\u52b9\u5316\u3059\u308b\u3053\u3068\u3082\u6709\u52b9\u306a\u5bfe\u7b56\u3068\u306a\u308a\u307e\u3059\u3002algif_aead\u304c\u30ed\u30fc\u30c9\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306f\u3001<code>lsmod | grep algif_aead<\/code>\u3067\u78ba\u8a8d\u3067\u304d\u3001<code>rmmod algif_aead<\/code>\u3067\u30a2\u30f3\u30ed\u30fc\u30c9\u3057\u307e\u3059(\u305f\u3060\u3057\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u30a2\u30f3\u30ed\u30fc\u30c9\u3067\u304d\u306a\u3044\u5834\u5408\u3082)\u3002<\/p>\n<p>\u6b21\u306e\u3088\u3046\u306bdisable-algif-aead.conf\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u30ed\u30fc\u30c9\u3092\u7981\u6b62\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre>\r\necho \"install algif_aead \/bin\/false\" > \/etc\/modprobe.d\/disable-algif-aead.conf\r\nrmmod algif_aead 2>\/dev\/null\r\n<\/pre>\n<p><a href=\"https:\/\/www.reddit.com\/r\/sysadmin\/comments\/1szajkx\/copy_fail_cve202631431_is_a_trivially_exploitable\/\">Reddit<\/a>\u3067\u3082\u3053\u306e\u554f\u984c\u306f\u8a71\u984c\u3068\u306a\u3063\u3066\u304a\u308a\u3001\u653b\u6483\u30b3\u30fc\u30c9\u306e\u30b7\u30f3\u30d7\u30eb\u3055\u3068\u6210\u529f\u7387\u306e\u9ad8\u3055\u304c\u3001\u30d7\u30ed\u30d5\u30a7\u30c3\u30b7\u30e7\u30ca\u30eb\u305f\u3061\u306b\u5f37\u3044\u885d\u6483\u3092\u4e0e\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux\u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u306e\u6839\u5e79\u3092\u63fa\u308b\u304c\u3059\u65b0\u305f\u306a\u8106\u5f31\u6027\u304c\u5831\u544a\u3055\u308c\u307e\u3057\u305f\u3002Xint Code\u304c\u516c\u958b\u3057\u305f\u65b0\u3057\u3044\u8106\u5f31\u6027\u3001\u901a\u79f0\u300cCopy Fail(CVE-2026-31431)\u300d\u306f\u3001\u308f\u305a\u304b732\u30d0\u30a4\u30c8\u306e\u77ed\u3044Python\u30b9\u30af\u30ea\u30d7\u30c8\u3092 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":134102,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[75],"tags":[37],"class_list":["post-134101","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software","tag-linux"],"_links":{"self":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts\/134101","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/comments?post=134101"}],"version-history":[{"count":0,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts\/134101\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/media\/134102"}],"wp:attachment":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/media?parent=134101"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/categories?post=134101"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/tags?post=134101"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}