{"id":"CVE-2026-97971","revision":null,"records":[{"revision":"f4a694d3455a4ac4ac27e569390336cb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97971","aliases":[],"title":"nstree: check listing permission before taking a namespace reference","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnstree: check listing permission before taking a namespace reference\n\nlegitimize_ns() takes a reference on the candidate namespace before\nmay_list_ns() has decided whether the caller may see it. The\n__free(ns_put) cleanup on the denied path can drop the last reference to a\nmount namespace while we still hold the rcu read lock, and put_mnt_ns()\nmay sleep there. This is the same problem commit 2ec2aff3c8e2 (\"ns: make\nsure reference are dropped outside of rcu lock\") fixed for the put_user()\npath. Neither ns_requested() nor may_list_ns() needs a reference, both\nonly look at the namespace type and at the caller's own namespaces, so do\nthe checks first and take the reference last.\n\nSplat:\n\n Voluntary context switch within RCU read-side critical section!\n WARNING: kernel/rcu/tree_plugin.h:332 at rcu_note_context_switch+0x238/0x2a0, CPU#5: a/3442\n CPU: 5 UID: 1000 PID: 3442 Comm: a Not tainted 7.0.0-30-generic #30-Ubuntu PREEMPT(lazy)\n RIP: 0010:rcu_note_context_switch+0x238/0x2a0\n Call Trace:\n \n __schedule+0xcf/0x650\n schedule+0x27/0x90\n schedule_preempt_disabled+0x15/0x30\n __mutex_lock.constprop.0+0x550/0xaf0\n __mutex_lock_slowpath+0x13/0x20\n mutex_lock+0x3b/0x50\n exp_funnel_lock+0xb2/0x260\n synchronize_rcu_expedited+0xe7/0x220\n namespace_unlock+0x26a/0x320\n put_mnt_ns+0xd3/0x120\n mntns_put+0xe/0x20\n do_listns+0x13e/0x560\n __do_sys_listns+0x126/0x2d0\n __x64_sys_listns+0x20/0x30\n x64_sys_call+0x2366/0x2390\n do_syscall_64+0x105/0x5a0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n ","state":0,"publishedAt":"2026-09-25T10:23:11.539+00:00","modifiedAt":"2026-10-19T09:11:37.164+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"kernel/nstree.c\"\n ],\n \"versions\": [\n {\n \"version\": \"76b6f5dfb3fda76fce1f9990d6fa58adc711122b\",\n \"lessThan\": \"9e673bf5d88aa898e52cef5c87058c3fa845bc71\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"76b6f5dfb3fda76fce1f9990d6fa58adc711122b\",\n \"lessThan\": \"56ea4e86832d8abe8930394473566c194d189f85\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"kernel/nstree.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.19\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.19\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.7\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/9e673bf5d88aa898e52cef5c87058c3fa845bc71","https://git.kernel.org/stable/c/56ea4e86832d8abe8930394473566c194d189f85"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97971","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97971","identifiers":["CVE-2026-97971"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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