{"id":"CVE-2026-72385","summary":"tracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry()\n\nfprobe_fgraph_entry() sizes a shadow-stack reservation in one walk of\nthe per-ip fprobe list and fills it in a second walk, both under\nrcu_read_lock() only. A fprobe registered on an already-live ip can\nbecome visible between the two walks, so the fill walk processes an\nexit_handler the sizing walk did not count and used runs past\nreserved_words. If the sizing walk counted nothing, fgraph_data is NULL\nand the first write_fprobe_header() faults:\n\n  Oops: general protection fault, probably for non-canonical address ...\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  RIP: 0010:fprobe_fgraph_entry+0xa38/0xf10 kernel/trace/fprobe.c:167\n  Call Trace:\n   \u003cTASK\u003e\n   function_graph_enter_regs+0x44c/0xa10 kernel/trace/fgraph.c:677\n   ftrace_graph_func+0xc5/0x140 arch/x86/kernel/ftrace.c:671\n   __kernel_text_address+0x9/0x40 kernel/extable.c:78\n   arch_stack_walk+0x117/0x170 arch/x86/kernel/stacktrace.c:26\n   kmem_cache_free+0x188/0x580 mm/slub.c:6378\n   tcp_data_queue+0x18d/0x6550 net/ipv4/tcp_input.c:5590\n   [...]\n   \u003c/TASK\u003e\n\nThe list cannot be frozen across the two walks, so skip a node that does\nnot fit the reservation and count it as missed.","modified":"2026-08-16T03:48:27.807545326Z","published":"2026-08-15T05:56:16.050Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72385.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/367c49d6e283c17b56a31e7a8d964a079244264c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/62988204162fc382cfc7d9a185d40a751261e3a3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d655cca1c6e67eb081214d37eb231a869ead2f97"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72385.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72385"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4346ba1604093305a287e08eb465a9c15ba05b80"},{"fixed":"62988204162fc382cfc7d9a185d40a751261e3a3"},{"fixed":"d655cca1c6e67eb081214d37eb231a869ead2f97"},{"fixed":"367c49d6e283c17b56a31e7a8d964a079244264c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72385.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.14.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72385.json"}}],"schema_version":"1.9.0"}