{"id":25022,"date":"2025-11-06T14:50:23","date_gmt":"2025-11-06T14:50:23","guid":{"rendered":"http:\/\/localhost\/?p=25022"},"modified":"2025-11-06T14:50:23","modified_gmt":"2025-11-06T14:50:23","slug":"runc-lsm-labels-can-be-bypassed-with-malicious-config-using-dummy-procfs-files","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=25022","title":{"rendered":"runc: LSM labels can be bypassed with malicious config using dummy procfs files_CVE-2025-52881"},"content":{"rendered":"

{“lastseen”:””,”description”:”runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7, 1.3.2 and 1.4.0-rc.2, an attacker can trick runc into misdirecting writes to \/proc to other procfs files through the use of a racing container with shared mounts (we have also verified this attack is possible to exploit using a standard Dockerfile with docker buildx build as that also permits triggering parallel execution of containers with custom shared mounts configured). This redirect could be through symbolic links in a tmpfs or theoretically other methods such as regular bind-mounts. While similar, the mitigation applied for the related CVE, CVE-2019-19921, was fairly limited and effectively only caused runc to verify that when LSM labels are written they are actually procfs files. This issue is fixed in versions 1.2.8, 1.3.3, and 1.4.0-rc.3.”,”published”:”2025-11-06T20:23:36.237Z”,”modified”:”2025-11-06T20:23:36.237Z”,”type”:”cve”,”title”:”runc: LSM labels can be bypassed with malicious config using dummy procfs files”,”source”:”GitHub_M”,”references”:”https:\/\/github.com\/opencontainers\/runc\/security\/advisories\/GHSA-cgrx-mc8f-2prm\\nhttps:\/\/github.com\/opencontainers\/runc\/security\/advisories\/GHSA-qw9x-cqr3-wc7r\\nhttps:\/\/github.com\/opencontainers\/runc\/security\/advisories\/GHSA-9493-h29p-rfm2\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/ff94f9991bd32076c871ef0ad8bc1b763458e480\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/ff6fe1324663538167eca8b3d3eec61e1bd4fa51\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/ed6b1693b8b3ae7eb0250a7e76fc888cdacf98c1\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/db19bbed5348847da433faa9d69e9f90192bfa64\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/d61fd29d854b416feaaf128bf650325cd2182165\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/d40b3439a9614a86e87b81a94c6811ec6fa2d7d2\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/b3dd1bc562ed9996d1a0f249e056c16624046d28\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/77d217c7c3775d8ca5af89e477e81568ef4572db\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/77889b56db939c323d29d1130f28f9aea2edb544\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/6fc191449109ea14bb7d61238f24a33fe08c651f\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/4b37cd93f86e72feac866442988b549b5b7bf3e6\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/44a0fcf685db051c80b8c269812bb177f5802c58\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/435cc81be6b79cdec73b4002c0dae549b2f6ae6d\\nhttps:\/\/github.com\/opencontainers\/runc\/commit\/3f925525b44d247e390e529e772a0dc0c0bc3557\\nhttps:\/\/github.com\/opencontainers\/runc\/blob\/v1.4.0-rc.2\/RELEASES.md\\nhttp:\/\/github.com\/opencontainers\/runc\/commit\/a41366e74080fa9f26a2cd3544e2801449697322\\nhttp:\/\/github.com\/opencontainers\/runc\/commit\/fdcc9d3cad2f85954a241ccb910a61aaa1ef47f3″,”id”:”CVE-2025-52881″,”bulletinFamily”:””,”cwe”:[“CWE-61″,”CWE-363″],”cvelist”:null,”sourceData”:”opencontainers runc \\u003c= 1.2.7, \\u003c 1.2.8\\nopencontainers runc \\u003c= 1.3.2, \\u003c 1.3.3\\nopencontainers runc \\u003c= 1.4.0-rc.2, \\u003c 1.4.0-rc.3″,”sourceHref”:””,”cvss”:{“score”:7.3,”severity”:”HIGH”,”vector”:”CVSS:4.0\/AV:L\/AC:L\/AT:P\/PR:L\/UI:A\/VC:H\/VI:H\/VA:H\/SC:H\/SI:H\/SA:H”,”version”:”4.0″},”cvss2″:{},”cvss3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””,”cvssV3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””}},”href”:””,”category_name”:”CVE”,”post_link”:””,”product”:”runc”,”version”:”\\u003c= 1.2.7, \\u003c 1.2.8″,”vendor”:”opencontainers”,”ai_description”:””,”ai_severity”:””,”ai_vendor”:””,”ai_product”:””,”ai_version”:””,”ai_score”:0}<\/p>\n","protected":false},"excerpt":{"rendered":"

{“lastseen”:””,”description”:”runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7, 1.3.2 and 1.4.0-rc.2, an attacker can trick…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[6,8,47,12,15,13,7,11,5],"class_list":["post-25022","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-cve","tag-cvss","tag-cvss-73","tag-exploit","tag-high","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\nrunc: LSM labels can be bypassed with malicious config using dummy procfs files_CVE-2025-52881 - zero redgem<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zero.redgem.net\/?p=25022\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"runc: LSM labels can be bypassed with malicious config using dummy procfs files_CVE-2025-52881 - zero redgem\" \/>\n<meta property=\"og:description\" content=\"{“lastseen”:””,”description”:”runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7, 1.3.2 and 1.4.0-rc.2, an attacker can trick...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/zero.redgem.net\/?p=25022\" \/>\n<meta property=\"og:site_name\" content=\"zero redgem\" \/>\n<meta property=\"article:published_time\" content=\"2025-11-06T14:50:23+00:00\" \/>\n<meta name=\"author\" content=\"invoker\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"invoker\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/?p=25022#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/?p=25022\"},\"author\":{\"name\":\"invoker\",\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/#\\\/schema\\\/person\\\/fbfeae8dfad117ac08a7621bee1a1dca\"},\"headline\":\"runc: LSM labels can be bypassed with malicious config using dummy procfs files_CVE-2025-52881\",\"datePublished\":\"2025-11-06T14:50:23+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/?p=25022\"},\"wordCount\":582,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/#organization\"},\"keywords\":[\"CVE\",\"CVSS\",\"CVSS-7.3\",\"exploit\",\"HIGH\",\"news\",\"Security\",\"tapic\",\"Vulnerability\"],\"articleSection\":[\"category_cve\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/zero.redgem.net\\\/?p=25022#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/?p=25022\",\"url\":\"https:\\\/\\\/zero.redgem.net\\\/?p=25022\",\"name\":\"runc: LSM labels can be bypassed with malicious config using dummy procfs files_CVE-2025-52881 - zero redgem\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/#website\"},\"datePublished\":\"2025-11-06T14:50:23+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/?p=25022#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/zero.redgem.net\\\/?p=25022\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/?p=25022#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/zero.redgem.net\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"runc: LSM labels can be bypassed with malicious config using dummy procfs files_CVE-2025-52881\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/#website\",\"url\":\"https:\\\/\\\/zero.redgem.net\\\/\",\"name\":\"zero redgem\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/zero.redgem.net\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/#organization\",\"name\":\"zero redgem\",\"url\":\"https:\\\/\\\/zero.redgem.net\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"\",\"contentUrl\":\"\",\"width\":191,\"height\":188,\"caption\":\"zero redgem\"},\"image\":{\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/zero.redgem.net\\\/#\\\/schema\\\/person\\\/fbfeae8dfad117ac08a7621bee1a1dca\",\"name\":\"invoker\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f17c01d7338e6932bcde121cf83569393df3374625d25afd62677cfb528f2e3e?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f17c01d7338e6932bcde121cf83569393df3374625d25afd62677cfb528f2e3e?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f17c01d7338e6932bcde121cf83569393df3374625d25afd62677cfb528f2e3e?s=96&d=mm&r=g\",\"caption\":\"invoker\"},\"sameAs\":[\"https:\\\/\\\/zero.redgem.net\"],\"url\":\"https:\\\/\\\/zero.redgem.net\\\/?author=1\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"runc: LSM labels can be bypassed with malicious config using dummy procfs files_CVE-2025-52881 - zero redgem","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/zero.redgem.net\/?p=25022","og_locale":"en_US","og_type":"article","og_title":"runc: LSM labels can be bypassed with malicious config using dummy procfs files_CVE-2025-52881 - zero redgem","og_description":"{“lastseen”:””,”description”:”runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7, 1.3.2 and 1.4.0-rc.2, an attacker can trick...","og_url":"https:\/\/zero.redgem.net\/?p=25022","og_site_name":"zero redgem","article_published_time":"2025-11-06T14:50:23+00:00","author":"invoker","twitter_card":"summary_large_image","twitter_misc":{"Written by":"invoker","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/zero.redgem.net\/?p=25022#article","isPartOf":{"@id":"https:\/\/zero.redgem.net\/?p=25022"},"author":{"name":"invoker","@id":"https:\/\/zero.redgem.net\/#\/schema\/person\/fbfeae8dfad117ac08a7621bee1a1dca"},"headline":"runc: LSM labels can be bypassed with malicious config using dummy procfs files_CVE-2025-52881","datePublished":"2025-11-06T14:50:23+00:00","mainEntityOfPage":{"@id":"https:\/\/zero.redgem.net\/?p=25022"},"wordCount":582,"commentCount":0,"publisher":{"@id":"https:\/\/zero.redgem.net\/#organization"},"keywords":["CVE","CVSS","CVSS-7.3","exploit","HIGH","news","Security","tapic","Vulnerability"],"articleSection":["category_cve"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/zero.redgem.net\/?p=25022#respond"]}]},{"@type":"WebPage","@id":"https:\/\/zero.redgem.net\/?p=25022","url":"https:\/\/zero.redgem.net\/?p=25022","name":"runc: LSM labels can be bypassed with malicious config using dummy procfs files_CVE-2025-52881 - zero redgem","isPartOf":{"@id":"https:\/\/zero.redgem.net\/#website"},"datePublished":"2025-11-06T14:50:23+00:00","breadcrumb":{"@id":"https:\/\/zero.redgem.net\/?p=25022#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/zero.redgem.net\/?p=25022"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/zero.redgem.net\/?p=25022#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/zero.redgem.net\/"},{"@type":"ListItem","position":2,"name":"runc: LSM labels can be bypassed with malicious config using dummy procfs files_CVE-2025-52881"}]},{"@type":"WebSite","@id":"https:\/\/zero.redgem.net\/#website","url":"https:\/\/zero.redgem.net\/","name":"zero redgem","description":"","publisher":{"@id":"https:\/\/zero.redgem.net\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/zero.redgem.net\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/zero.redgem.net\/#organization","name":"zero redgem","url":"https:\/\/zero.redgem.net\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/zero.redgem.net\/#\/schema\/logo\/image\/","url":"","contentUrl":"","width":191,"height":188,"caption":"zero redgem"},"image":{"@id":"https:\/\/zero.redgem.net\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/zero.redgem.net\/#\/schema\/person\/fbfeae8dfad117ac08a7621bee1a1dca","name":"invoker","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/f17c01d7338e6932bcde121cf83569393df3374625d25afd62677cfb528f2e3e?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/f17c01d7338e6932bcde121cf83569393df3374625d25afd62677cfb528f2e3e?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/f17c01d7338e6932bcde121cf83569393df3374625d25afd62677cfb528f2e3e?s=96&d=mm&r=g","caption":"invoker"},"sameAs":["https:\/\/zero.redgem.net"],"url":"https:\/\/zero.redgem.net\/?author=1"}]}},"_links":{"self":[{"href":"https:\/\/zero.redgem.net\/index.php?rest_route=\/wp\/v2\/posts\/25022","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zero.redgem.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zero.redgem.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zero.redgem.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zero.redgem.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=25022"}],"version-history":[{"count":0,"href":"https:\/\/zero.redgem.net\/index.php?rest_route=\/wp\/v2\/posts\/25022\/revisions"}],"wp:attachment":[{"href":"https:\/\/zero.redgem.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=25022"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zero.redgem.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25022"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zero.redgem.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25022"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}