{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2024-43882", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-43882", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-08-21T00:10:49.556Z", "updatedAt": "2026-10-15T00:48:49.093Z", "importedAt": "2026-10-24T01:57:16.009Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "exec: Fix ToCToU between perm check and set-uid/gid usage", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nexec: Fix ToCToU between perm check and set-uid/gid usage\n\nWhen opening a file for exec via do_filp_open(), permission checking is\ndone against the file's metadata at that moment, and on success, a file\npointer is passed back. Much later in the execve() code path, the file\nmetadata (specifically mode, uid, and gid) is used to determine if/how\nto set the uid and gid. However, those values may have changed since the\npermissions check, meaning the execution may gain unintended privileges.\n\nFor example, if a file could change permissions from executable and not\nset-id:\n\n---------x 1 root root 16048 Aug 7 13:16 target\n\nto set-id and non-executable:\n\n---S------ 1 root root 16048 Aug 7 13:16 target\n\nit is possible to gain root privileges when execution should have been\ndisallowed.\n\nWhile this race condition is rare in real-world scenarios, it has been\nobserved (and proven exploitable) when package managers are updating\nthe setuid bits of installed programs. Such files start with being\nworld-executable but then are adjusted to be group-exec with a set-uid\nbit. For example, \"chmod o-x,u+s target\" makes \"target\" executable only\nby uid \"root\" and gid \"cdrom\", while also becoming setuid-root:\n\n-rwxr-xr-x 1 root cdrom 16048 Aug 7 13:16 target\n\nbecomes:\n\n-rwsr-xr-- 1 root cdrom 16048 Aug 7 13:16 target\n\nBut racing the chmod means users without group \"cdrom\" membership can\nget the permission to execute \"target\" just before the chmod, and when\nthe chmod finishes, the exec reaches brpm_fill_uid(), and performs the\nsetuid to root, violating the expressed authorization of \"only cdrom\ngroup members can setuid to root\".\n\nRe-check that we still have execute permissions in case the metadata\nhas changed. It would be better to keep a copy from the perm-check time,\nbut until we can do that refactoring, the least-bad option is to do a\nfull inode_permission() call (under inode lock). It is understood that\nthis is safe against dead-locks, but hardly optimal.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "status": "affected", "versionType": "git", "lessThan": "d5c3c7e26275a2d83b894d30f7582a42853a958f" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "status": "affected", "versionType": "git", "lessThan": "368f6985d46657b8b466a421dddcacd4051f7ada" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "status": "affected", "versionType": "git", "lessThan": "15469d46ba34559bfe7e3de6659115778c624759" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "status": "affected", "versionType": "git", "lessThan": "9b424c5d4130d56312e2a3be17efb0928fec4d64" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "status": "affected", "versionType": "git", "lessThan": "f6cfc6bcfd5e1cf76115b6450516ea4c99897ae1" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "status": "affected", "versionType": "git", "lessThan": "d2a2a4714d80d09b0f8eb6438ab4224690b7121e" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "status": "affected", "versionType": "git", "lessThan": "90dfbba89ad4f0d9c9744ecbb1adac4aa2ff4f3e" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "status": "affected", "versionType": "git", "lessThan": "f50733b45d865f91db90919f8311e2127ce5a0cb" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.18", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.18" }, { "version": "4.19.320", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.282", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.224", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.165", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.106", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.47", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.10.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.10.*" }, { "version": "6.11", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }