CVE-2024-43853

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-43853", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-17T09:11:59.277Z", "datePublished": "2024-08-17T09:22:10.534Z", "dateUpdated": "2026-08-05T11:36:48.073Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:36:48.073Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup/cpuset: Prevent UAF in proc_cpuset_show()\n\nAn UAF can happen when /proc/cpuset is read as reported in [1].\n\nThis can be reproduced by the following methods:\n1.add an mdelay(1000) before acquiring the cgroup_lock In the\n cgroup_path_ns function.\n2.$cat /proc/<pid>/cpuset repeatly.\n3.$mount -t cgroup -o cpuset cpuset /sys/fs/cgroup/cpuset/\n$umount /sys/fs/cgroup/cpuset/ repeatly.\n\nThe race that cause this bug can be shown as below:\n\n(umount)\t\t|\t(cat /proc/<pid>/cpuset)\ncss_release\t\t|\tproc_cpuset_show\ncss_release_work_fn\t|\tcss = task_get_css(tsk, cpuset_cgrp_id);\ncss_free_rwork_fn\t|\tcgroup_path_ns(css->cgroup, ...);\ncgroup_destroy_root\t|\tmutex_lock(&cgroup_mutex);\nrebind_subsystems\t|\ncgroup_free_root \t|\n\t\t\t|\t// cgrp was freed, UAF\n\t\t\t|\tcgroup_path_ns_locked(cgrp,..);\n\nWhen the cpuset is initialized, the root node top_cpuset.css.cgrp\nwill point to &cgrp_dfl_root.cgrp. In cgroup v1, the mount operation will\nallocate cgroup_root, and top_cpuset.css.cgrp will point to the allocated\n&cgroup_root.cgrp. When the umount operation is executed,\ntop_cpuset.css.cgrp will be rebound to &cgrp_dfl_root.cgrp.\n\nThe problem is that when rebinding to cgrp_dfl_root, there are cases\nwhere the cgroup_root allocated by setting up the root for cgroup v1\nis cached. This could lead to a Use-After-Free (UAF) if it is\nsubsequently freed. The descendant cgroups of cgroup v1 can only be\nfreed after the css is released. However, the css of the root will never\nbe released, yet the cgroup_root should be freed when it is unmounted.\nThis means that obtaining a reference to the css of the root does\nnot guarantee that css.cgrp->root will not be freed.\n\nFix this problem by using rcu_read_lock in proc_cpuset_show().\nAs cgroup_root is kfree_rcu after commit d23b5c577715\n(\"cgroup: Make operations on the cgroup root_list RCU safe\"),\ncss->cgroup won't be freed during the critical section.\nTo call cgroup_path_ns_locked, css_set_lock is needed, so it is safe to\nreplace task_get_css with task_css.\n\n[1] https://syzkaller.appspot.com/bug?extid=9b1ff7be974a403aa4cd"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path is reached by reading /proc/<pid>/cpuset, and the freeing side is the mount/umount syscall path for a cgroup-v1 cpuset hierarchy; both require local access to the system with no network exposure.\nAC:H - The unprivileged attacker controls only the read side of the race (looping on /proc/self/cpuset); the cgroup_destroy_root()/cgroup_free_root() side requires a cgroup-v1 umount that CAP_SYS_ADMIN checks in cgroup1_get_tree() and the init_cgroup_ns restriction put beyond the attacker's control, so the attacker must wait for privileged mount/umount activity.\nPR:L - proc_cpuset_show is registered S_IRUGO and any unprivileged local user can read /proc/self/cpuset to enter the vulnerable function; no capability is needed to trigger the use-after-free dereference itself.\nUI:N - No victim action is needed for the attacker's own operations \u2014 the attacker simply reads a world-readable procfs file in a loop; the concurrent umount is a system/administrative event modeled under attack complexity, not a targeted user interaction.\nS:U - The use-after-free occurs in kernel memory and its impact stays within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - kernfs_path_from_node() dereferences freed cgroup_root/kernfs_node memory and copies the resulting name strings directly into the buffer emitted to userspace via /proc/<pid>/cpuset, so a reallocated/sprayed slab yields kernel memory disclosure to the attacker.\nI:H - This is a use-after-free on a kfree_rcu'd cgroup_root plus torn-down kernfs nodes; controlling the reallocated object gives pointer-controlled dereferences that can be leveraged with heap grooming for corruption and control-flow influence.\nA:H - The freed cgrp_cset_link list makes cset_cgroup_from_root() return NULL, leading to a NULL/wild dereference in kernfs_path_from_node(), and the UAF reliably produces an oops or panic (this is exactly how syzkaller reported it)."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", 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"5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.103", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.44", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.3", "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": "4.6", "versionEndExcluding": "4.19.321"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.4.283"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": 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"https://git.kernel.org/stable/c/688325078a8b5badd6e07ae22b27cd04e9947aec"}, {"url": "https://git.kernel.org/stable/c/4e8d6ac8fc9f843e940ab7389db8136634e07989"}, {"url": "https://git.kernel.org/stable/c/29a8d4e02fd4840028c38ceb1536cc8f82a257d4"}, {"url": "https://git.kernel.org/stable/c/96226fbed566f3f686f53a489a29846f2d538080"}, {"url": "https://git.kernel.org/stable/c/29ac1d238b3bf126af36037df80d7ecc4822341e"}, {"url": "https://git.kernel.org/stable/c/1be59c97c83ccd67a519d8a49486b3a8a73ca28a"}], "title": "cgroup/cpuset: Prevent UAF in proc_cpuset_show()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-43853", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T16:07:17.671649Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": 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"vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "lessThan": "27d6dbdc6485d68075a0ebf8544d6425c1ed84bb", "versionType": "git"}, {"status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "lessThan": "10aeaa47e4aa2432f29b3e5376df96d7dac5537a", "versionType": "git"}, {"status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "lessThan": "688325078a8b5badd6e07ae22b27cd04e9947aec", "versionType": "git"}, {"status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "lessThan": "4e8d6ac8fc9f843e940ab7389db8136634e07989", "versionType": "git"}, {"status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "lessThan": "29a8d4e02fd4840028c38ceb1536cc8f82a257d4", "versionType": "git"}, {"status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "lessThan": "96226fbed566f3f686f53a489a29846f2d538080", "versionType": "git"}, 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"5.15.166", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.103", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.44", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.10.3", "versionType": "semver", "lessThanOrEqual": "6.10.*"}, {"status": "unaffected", "version": "6.11", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["kernel/cgroup/cpuset.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/27d6dbdc6485d68075a0ebf8544d6425c1ed84bb"}, {"url": "https://git.kernel.org/stable/c/10aeaa47e4aa2432f29b3e5376df96d7dac5537a"}, {"url": "https://git.kernel.org/stable/c/688325078a8b5badd6e07ae22b27cd04e9947aec"}, {"url": "https://git.kernel.org/stable/c/4e8d6ac8fc9f843e940ab7389db8136634e07989"}, {"url": "https://git.kernel.org/stable/c/29a8d4e02fd4840028c38ceb1536cc8f82a257d4"}, {"url": "https://git.kernel.org/stable/c/96226fbed566f3f686f53a489a29846f2d538080"}, {"url": "https://git.kernel.org/stable/c/29ac1d238b3bf126af36037df80d7ecc4822341e"}, {"url": "https://git.kernel.org/stable/c/1be59c97c83ccd67a519d8a49486b3a8a73ca28a"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup/cpuset: Prevent UAF in proc_cpuset_show()\n\nAn UAF can happen when /proc/cpuset is read as reported in [1].\n\nThis can be reproduced by the following methods:\n1.add an mdelay(1000) before acquiring the cgroup_lock In the\n cgroup_path_ns function.\n2.$cat /proc/<pid>/cpuset repeatly.\n3.$mount -t cgroup -o cpuset cpuset /sys/fs/cgroup/cpuset/\n$umount /sys/fs/cgroup/cpuset/ repeatly.\n\nThe race that cause this bug can be shown as below:\n\n(umount)\t\t|\t(cat /proc/<pid>/cpuset)\ncss_release\t\t|\tproc_cpuset_show\ncss_release_work_fn\t|\tcss = task_get_css(tsk, cpuset_cgrp_id);\ncss_free_rwork_fn\t|\tcgroup_path_ns(css->cgroup, ...);\ncgroup_destroy_root\t|\tmutex_lock(&cgroup_mutex);\nrebind_subsystems\t|\ncgroup_free_root \t|\n\t\t\t|\t// cgrp was freed, UAF\n\t\t\t|\tcgroup_path_ns_locked(cgrp,..);\n\nWhen the cpuset is initialized, the root node top_cpuset.css.cgrp\nwill point to &cgrp_dfl_root.cgrp. In cgroup v1, the mount operation will\nallocate cgroup_root, and top_cpuset.css.cgrp will point to the allocated\n&cgroup_root.cgrp. When the umount operation is executed,\ntop_cpuset.css.cgrp will be rebound to &cgrp_dfl_root.cgrp.\n\nThe problem is that when rebinding to cgrp_dfl_root, there are cases\nwhere the cgroup_root allocated by setting up the root for cgroup v1\nis cached. This could lead to a Use-After-Free (UAF) if it is\nsubsequently freed. The descendant cgroups of cgroup v1 can only be\nfreed after the css is released. However, the css of the root will never\nbe released, yet the cgroup_root should be freed when it is unmounted.\nThis means that obtaining a reference to the css of the root does\nnot guarantee that css.cgrp->root will not be freed.\n\nFix this problem by using rcu_read_lock in proc_cpuset_show().\nAs cgroup_root is kfree_rcu after commit d23b5c577715\n(\"cgroup: Make operations on the cgroup root_list RCU safe\"),\ncss->cgroup won't be freed during the critical section.\nTo call cgroup_path_ns_locked, css_set_lock is needed, so it is safe to\nreplace task_get_css with task_css.\n\n[1] https://syzkaller.appspot.com/bug?extid=9b1ff7be974a403aa4cd"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.321", "versionStartIncluding": "4.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.283", "versionStartIncluding": "4.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.225", "versionStartIncluding": "4.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.166", "versionStartIncluding": "4.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.103", "versionStartIncluding": "4.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.44", "versionStartIncluding": "4.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.10.3", "versionStartIncluding": "4.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.11", "versionStartIncluding": "4.6"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:31:05.140Z"}}}, "cveMetadata": {"cveId": "CVE-2024-43853", "state": "PUBLISHED", "dateUpdated": "2026-05-11T20:31:05.140Z", "dateReserved": "2024-08-17T09:11:59.277Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-08-17T09:22:10.534Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/cgroup/cpuset.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "27d6dbdc6485d68075a0ebf8544d6425c1ed84bb", "status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "versionType": "git"}, {"lessThan": "10aeaa47e4aa2432f29b3e5376df96d7dac5537a", "status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "versionType": "git"}, {"lessThan": "688325078a8b5badd6e07ae22b27cd04e9947aec", "status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "versionType": "git"}, {"lessThan": "4e8d6ac8fc9f843e940ab7389db8136634e07989", "status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "versionType": "git"}, {"lessThan": "29a8d4e02fd4840028c38ceb1536cc8f82a257d4", "status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "versionType": "git"}, {"lessThan": "96226fbed566f3f686f53a489a29846f2d538080", "status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "versionType": "git"}, {"lessThan": "29ac1d238b3bf126af36037df80d7ecc4822341e", "status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "versionType": "git"}, {"lessThan": "1be59c97c83ccd67a519d8a49486b3a8a73ca28a", "status": "affected", "version": "a79a908fd2b080977b45bf103184b81c9d11ad07", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/cgroup/cpuset.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.6"}, {"lessThan": "4.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "4.19.*", "status": "unaffected", "version": "4.19.321", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.283", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.225", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.166", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.103", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.44", "versionType": "semver"}, {"lessThanOrEqual": "6.10.*", "status": "unaffected", "version": "6.10.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.11", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B8828E57-70E4-428D-BC12-F89414C8715F", "versionEndExcluding": "6.1.103", "versionStartIncluding": "4.6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CC912330-6B41-4C6B-99AF-F3857FBACB6A", "versionEndExcluding": "6.6.44", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "92D388F2-1EAF-4CFA-AC06-5B26D762EA7D", "versionEndExcluding": "6.10.3", "versionStartIncluding": "6.7", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup/cpuset: Prevent UAF in proc_cpuset_show()\n\nAn UAF can happen when /proc/cpuset is read as reported in [1].\n\nThis can be reproduced by the following methods:\n1.add an mdelay(1000) before acquiring the cgroup_lock In the\n cgroup_path_ns function.\n2.$cat /proc/<pid>/cpuset repeatly.\n3.$mount -t cgroup -o cpuset cpuset /sys/fs/cgroup/cpuset/\n$umount /sys/fs/cgroup/cpuset/ repeatly.\n\nThe race that cause this bug can be shown as below:\n\n(umount)\t\t|\t(cat /proc/<pid>/cpuset)\ncss_release\t\t|\tproc_cpuset_show\ncss_release_work_fn\t|\tcss = task_get_css(tsk, cpuset_cgrp_id);\ncss_free_rwork_fn\t|\tcgroup_path_ns(css->cgroup, ...);\ncgroup_destroy_root\t|\tmutex_lock(&cgroup_mutex);\nrebind_subsystems\t|\ncgroup_free_root \t|\n\t\t\t|\t// cgrp was freed, UAF\n\t\t\t|\tcgroup_path_ns_locked(cgrp,..);\n\nWhen the cpuset is initialized, the root node top_cpuset.css.cgrp\nwill point to &cgrp_dfl_root.cgrp. In cgroup v1, the mount operation will\nallocate cgroup_root, and top_cpuset.css.cgrp will point to the allocated\n&cgroup_root.cgrp. When the umount operation is executed,\ntop_cpuset.css.cgrp will be rebound to &cgrp_dfl_root.cgrp.\n\nThe problem is that when rebinding to cgrp_dfl_root, there are cases\nwhere the cgroup_root allocated by setting up the root for cgroup v1\nis cached. This could lead to a Use-After-Free (UAF) if it is\nsubsequently freed. The descendant cgroups of cgroup v1 can only be\nfreed after the css is released. However, the css of the root will never\nbe released, yet the cgroup_root should be freed when it is unmounted.\nThis means that obtaining a reference to the css of the root does\nnot guarantee that css.cgrp->root will not be freed.\n\nFix this problem by using rcu_read_lock in proc_cpuset_show().\nAs cgroup_root is kfree_rcu after commit d23b5c577715\n(\"cgroup: Make operations on the cgroup root_list RCU safe\"),\ncss->cgroup won't be freed during the critical section.\nTo call cgroup_path_ns_locked, css_set_lock is needed, so it is safe to\nreplace task_get_css with task_css.\n\n[1] https://syzkaller.appspot.com/bug?extid=9b1ff7be974a403aa4cd"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cgroup/cpuset: Prevenir UAF en proc_cpuset_show() Puede ocurrir un UAF cuando se lee /proc/cpuset como se informa en [1]. Esto se puede reproducir mediante los siguientes m\u00e9todos: 1.Agregue un mdelay(1000) antes de adquirir cgroup_lock en la funci\u00f3n cgroup_path_ns. 2.$cat /proc//cpuset repetidamente. 3.$mount -t cgroup -o cpuset cpuset /sys/fs/cgroup/cpuset/ $umount /sys/fs/cgroup/cpuset/ repetidamente. La ejecuci\u00f3n que causa este error se puede mostrar a continuaci\u00f3n: (umount) | (cat /proc//cpuset) css_release | proc_cpuset_show css_release_work_fn | css = task_get_css(tsk, cpuset_cgrp_id); css_free_rwork_fn | cgroup_path_ns(css-&gt;cgroup, ...); cgroup_destroy_root | mutex_lock(&amp;cgroup_mutex); rebind_subsistemas | cgroup_free_root | | // cgrp fue liberado, UAF | cgroup_path_ns_locked(cgrp,..); Cuando se inicializa cpuset, el nodo ra\u00edz top_cpuset.css.cgrp apuntar\u00e1 a &amp;cgrp_dfl_root.cgrp. En cgroup v1, la operaci\u00f3n de montaje asignar\u00e1 cgroup_root y top_cpuset.css.cgrp apuntar\u00e1 al &amp;cgroup_root.cgrp asignado. Cuando se ejecuta la operaci\u00f3n desmontaje, top_cpuset.css.cgrp se rebotar\u00e1 en &amp;cgrp_dfl_root.cgrp. El problema es que al volver a vincular a cgrp_dfl_root, hay casos en los que el cgroup_root asignado al configurar la ra\u00edz para cgroup v1 se almacena en cach\u00e9. Esto podr\u00eda dar lugar a un use-after-free (UAF) si se libera posteriormente. Los cgroups descendientes de cgroup v1 solo se pueden liberar despu\u00e9s de que se publique el CSS. Sin embargo, el CSS de la ra\u00edz nunca se liberar\u00e1, pero cgroup_root debe liberarse cuando se desmonta. Esto significa que obtener una referencia al CSS de la ra\u00edz no garantiza que css.cgrp-&gt;root no se libere. Solucione este problema usando rcu_read_lock en proc_cpuset_show(). Como cgroup_root es kfree_rcu despu\u00e9s del commit d23b5c577715 (\"cgroup: hacer que las operaciones en la RCU cgroup root_list sean seguras\"), css-&gt;cgroup no se liberar\u00e1 durante la secci\u00f3n cr\u00edtica. Para llamar a cgroup_path_ns_locked, se necesita css_set_lock, por lo que es seguro reemplazar task_get_css con task_css. [1] https://syzkaller.appspot.com/bug?extid=9b1ff7be974a403aa4cd"}], "id": "CVE-2024-43853", "lastModified": "2026-08-04T11:19:55.060", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-43853", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T16:07:17.671649Z", "version": "2.0.3"}}]}, "published": "2024-08-17T10:15:10.383", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/10aeaa47e4aa2432f29b3e5376df96d7dac5537a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1be59c97c83ccd67a519d8a49486b3a8a73ca28a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/27d6dbdc6485d68075a0ebf8544d6425c1ed84bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/29a8d4e02fd4840028c38ceb1536cc8f82a257d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/29ac1d238b3bf126af36037df80d7ecc4822341e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4e8d6ac8fc9f843e940ab7389db8136634e07989"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/688325078a8b5badd6e07ae22b27cd04e9947aec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/96226fbed566f3f686f53a489a29846f2d538080"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2025:6966", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:6966", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}], "bugzilla": {"description": "kernel: cgroup/cpuset: Prevent UAF in proc_cpuset_show()", "id": "2305511", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2305511"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncgroup/cpuset: Prevent UAF in proc_cpuset_show()\nAn UAF can happen when /proc/cpuset is read as reported in [1].\nThis can be reproduced by the following methods:\n1.add an mdelay(1000) before acquiring the cgroup_lock In the\ncgroup_path_ns function.\n2.$cat /proc/<pid>/cpuset repeatly.\n3.$mount -t cgroup -o cpuset cpuset /sys/fs/cgroup/cpuset/\n$umount /sys/fs/cgroup/cpuset/ repeatly.\nThe race that cause this bug can be shown as below:\n(umount)|(cat /proc/<pid>/cpuset)\ncss_release|proc_cpuset_show\ncss_release_work_fn|css = task_get_css(tsk, cpuset_cgrp_id);\ncss_free_rwork_fn|cgroup_path_ns(css->cgroup, ...);\ncgroup_destroy_root|mutex_lock(&cgroup_mutex);\nrebind_subsystems|\ncgroup_free_root |\n|// cgrp was freed, UAF\n|cgroup_path_ns_locked(cgrp,..);\nWhen the cpuset is initialized, the root node top_cpuset.css.cgrp\nwill point to &cgrp_dfl_root.cgrp. In cgroup v1, the mount operation will\nallocate cgroup_root, and top_cpuset.css.cgrp will point to the allocated\n&cgroup_root.cgrp. When the umount operation is executed,\ntop_cpuset.css.cgrp will be rebound to &cgrp_dfl_root.cgrp.\nThe problem is that when rebinding to cgrp_dfl_root, there are cases\nwhere the cgroup_root allocated by setting up the root for cgroup v1\nis cached. This could lead to a Use-After-Free (UAF) if it is\nsubsequently freed. The descendant cgroups of cgroup v1 can only be\nfreed after the css is released. However, the css of the root will never\nbe released, yet the cgroup_root should be freed when it is unmounted.\nThis means that obtaining a reference to the css of the root does\nnot guarantee that css.cgrp->root will not be freed.\nFix this problem by using rcu_read_lock in proc_cpuset_show().\nAs cgroup_root is kfree_rcu after commit d23b5c577715\n(\"cgroup: Make operations on the cgroup root_list RCU safe\"),\ncss->cgroup won't be freed during the critical section.\nTo call cgroup_path_ns_locked, css_set_lock is needed, so it is safe to\nreplace task_get_css with task_css.\n[1] https://syzkaller.appspot.com/bug?extid=9b1ff7be974a403aa4cd", "A use-after-free (UAF) flaw was found in the proc_cpuset_show() function. This issue can allow an attacker to access the css of the root caused by a race condition when the cgroup_root should be freed when it is unmounted from the resource."], "mitigation": {"lang": "en:us", "value": "No mitigation is available for this issue other than updating the affected package to the version containing the fix."}, "name": "CVE-2024-43853", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-08-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-43853\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-43853\nhttps://lore.kernel.org/linux-cve-announce/2024081734-CVE-2024-43853-da5b@gregkh/T"], "statement": "The cpuset resource can only impact the availability of the system by skipping limitations from the CPU and causing a Denial of Service attack.", "threat_severity": "Moderate"}

{}