{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-43882", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-17T09:11:59.287Z", "datePublished": "2024-08-21T00:10:49.556Z", "dateUpdated": "2026-08-05T11:36:57.729Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:36:57.729Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerability is reached through the execve()/execveat() syscall path (do_execveat_common → bprm_execve → bprm_fill_uid), requiring local access to the system. No network protocol or remote data processing is involved.\nAC:L - The attacker fully controls their side of the race and can stall a permission-checked exec indefinitely, because copy_strings() for argv/envp runs after do_open_execat()'s MAY_EXEC check and faults on attacker-owned pages (userfaultfd/FUSE-backed), so the exec can be parked until the setuid-adding chmod is observed via inotify; the exec loop can also simply be run continuously at no cost, and on typical desktop configurations the unprivileged attacker can trigger the package-manager operation themselves via PackageKit/polkit.\nPR:L - Requires only an unprivileged local account able to execute the target file at the moment of open (e.g. while it is still world-executable). No capabilities, no group membership, and no user-namespace tricks are needed.\nUI:N - No human victim action is needed — the triggering chmod is performed by automated package-manager activity (unattended-upgrades/dnf-automatic/dpkg unpack) or can be induced by the attacker via PackageKit, while the attacker's exec loop runs unattended.\nS:U - This is a standard local privilege escalation within the same security authority: an unprivileged user gains root on the same OS instance, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - Successful exploitation yields euid 0 in the initial user namespace, granting unrestricted read access to all files, memory, and secrets on the system.\nI:H - Root privileges allow arbitrary modification of any file, kernel configuration, and system state — a complete loss of integrity, which is precisely the \"unintended privileges\" the commit describes as proven exploitable.\nA:H - With root obtained, the attacker can shut down, panic, or otherwise render the system entirely unavailable." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/exec.c" ], "versions": [ { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "lessThan": "d5c3c7e26275a2d83b894d30f7582a42853a958f", "status": "affected", "versionType": "git" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "lessThan": "368f6985d46657b8b466a421dddcacd4051f7ada", "status": "affected", "versionType": "git" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "lessThan": "15469d46ba34559bfe7e3de6659115778c624759", "status": "affected", "versionType": "git" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "lessThan": "9b424c5d4130d56312e2a3be17efb0928fec4d64", "status": "affected", "versionType": "git" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "lessThan": "f6cfc6bcfd5e1cf76115b6450516ea4c99897ae1", "status": "affected", "versionType": "git" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "lessThan": "d2a2a4714d80d09b0f8eb6438ab4224690b7121e", "status": "affected", "versionType": "git" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "lessThan": "90dfbba89ad4f0d9c9744ecbb1adac4aa2ff4f3e", "status": "affected", "versionType": "git" }, { "version": "9167b0b9a0ab7907191523f5a0528e3b9c288e21", "lessThan": "f50733b45d865f91db90919f8311e2127ce5a0cb", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/exec.c" ], "versions": [ { "version": "2.6.18", "status": "affected" }, { "version": "0", "lessThan": "2.6.18", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.320", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.282", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.224", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.165", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.106", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.47", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.6", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "4.19.320" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "5.4.282" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "5.10.224" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "5.15.165" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "6.1.106" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "6.6.47" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "6.10.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "6.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d5c3c7e26275a2d83b894d30f7582a42853a958f" }, { "url": "https://git.kernel.org/stable/c/368f6985d46657b8b466a421dddcacd4051f7ada" }, { "url": "https://git.kernel.org/stable/c/15469d46ba34559bfe7e3de6659115778c624759" }, { "url": "https://git.kernel.org/stable/c/9b424c5d4130d56312e2a3be17efb0928fec4d64" }, { "url": "https://git.kernel.org/stable/c/f6cfc6bcfd5e1cf76115b6450516ea4c99897ae1" }, { "url": "https://git.kernel.org/stable/c/d2a2a4714d80d09b0f8eb6438ab4224690b7121e" }, { "url": "https://git.kernel.org/stable/c/90dfbba89ad4f0d9c9744ecbb1adac4aa2ff4f3e" }, { "url": "https://git.kernel.org/stable/c/f50733b45d865f91db90919f8311e2127ce5a0cb" } ], "title": "exec: Fix ToCToU between perm check and set-uid/gid usage", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-367", "lang": "en", "description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 8.4, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-12-10T04:55:56.573367Z", "id": "CVE-2024-43882", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-12-10T18:58:31.805Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:06:36.516Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-05-12T11:57:09.220Z" }, "affected": [ { "vendor": "Siemens", "product": "RUGGEDCOM RST2428P", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.1", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "RUGGEDCOM RST2428P", "versions": [ { "status": "unaffected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family", "versions": [ { "status": "unaffected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family", "versions": [ { "status": "unaffected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XCM-/XRM-/XCH-/XRH-300 family", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.1", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XCM-/XRM-/XCH-/XRH-300 family", "versions": [ { "status": "unaffected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html" }, { "url": "https://cert-portal.siemens.com/productcert/html/ssa-613116.html" }, { "url": "https://cert-portal.siemens.com/productcert/html/ssa-355557.html" } ] } ] } }