214 lines
13 KiB
JSON
214 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-23088",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-01-13T15:37:45.961Z",
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"datePublished": "2026-02-04T16:08:11.717Z",
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"dateUpdated": "2026-05-23T16:03:48.056Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-05-23T16:03:48.056Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix crash on synthetic stacktrace field usage\n\nWhen creating a synthetic event based on an existing synthetic event that\nhad a stacktrace field and the new synthetic event used that field a\nkernel crash occurred:\n\n ~# cd /sys/kernel/tracing\n ~# echo 's:stack unsigned long stack[];' > dynamic_events\n ~# echo 'hist:keys=prev_pid:s0=common_stacktrace if prev_state & 3' >> events/sched/sched_switch/trigger\n ~# echo 'hist:keys=next_pid:s1=$s0:onmatch(sched.sched_switch).trace(stack,$s1)' >> events/sched/sched_switch/trigger\n\nThe above creates a synthetic event that takes a stacktrace when a task\nschedules out in a non-running state and passes that stacktrace to the\nsched_switch event when that task schedules back in. It triggers the\n\"stack\" synthetic event that has a stacktrace as its field (called \"stack\").\n\n ~# echo 's:syscall_stack s64 id; unsigned long stack[];' >> dynamic_events\n ~# echo 'hist:keys=common_pid:s2=stack' >> events/synthetic/stack/trigger\n ~# echo 'hist:keys=common_pid:s3=$s2,i0=id:onmatch(synthetic.stack).trace(syscall_stack,$i0,$s3)' >> events/raw_syscalls/sys_exit/trigger\n\nThe above makes another synthetic event called \"syscall_stack\" that\nattaches the first synthetic event (stack) to the sys_exit trace event and\nrecords the stacktrace from the stack event with the id of the system call\nthat is exiting.\n\nWhen enabling this event (or using it in a historgram):\n\n ~# echo 1 > events/synthetic/syscall_stack/enable\n\nProduces a kernel crash!\n\n BUG: unable to handle page fault for address: 0000000000400010\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: Oops: 0000 [#1] SMP PTI\n CPU: 6 UID: 0 PID: 1257 Comm: bash Not tainted 6.16.3+deb14-amd64 #1 PREEMPT(lazy) Debian 6.16.3-1\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\n RIP: 0010:trace_event_raw_event_synth+0x90/0x380\n Code: c5 00 00 00 00 85 d2 0f 84 e1 00 00 00 31 db eb 34 0f 1f 00 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 <49> 8b 04 24 48 83 c3 01 8d 0c c5 08 00 00 00 01 cd 41 3b 5d 40 0f\n RSP: 0018:ffffd2670388f958 EFLAGS: 00010202\n RAX: ffff8ba1065cc100 RBX: 0000000000000000 RCX: 0000000000000000\n RDX: 0000000000000001 RSI: fffff266ffda7b90 RDI: ffffd2670388f9b0\n RBP: 0000000000000010 R08: ffff8ba104e76000 R09: ffffd2670388fa50\n R10: ffff8ba102dd42e0 R11: ffffffff9a908970 R12: 0000000000400010\n R13: ffff8ba10a246400 R14: ffff8ba10a710220 R15: fffff266ffda7b90\n FS: 00007fa3bc63f740(0000) GS:ffff8ba2e0f48000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000400010 CR3: 0000000107f9e003 CR4: 0000000000172ef0\n Call Trace:\n <TASK>\n ? __tracing_map_insert+0x208/0x3a0\n action_trace+0x67/0x70\n event_hist_trigger+0x633/0x6d0\n event_triggers_call+0x82/0x130\n trace_event_buffer_commit+0x19d/0x250\n trace_event_raw_event_sys_exit+0x62/0xb0\n syscall_exit_work+0x9d/0x140\n do_syscall_64+0x20a/0x2f0\n ? trace_event_raw_event_sched_switch+0x12b/0x170\n ? save_fpregs_to_fpstate+0x3e/0x90\n ? _raw_spin_unlock+0xe/0x30\n ? finish_task_switch.isra.0+0x97/0x2c0\n ? __rseq_handle_notify_resume+0xad/0x4c0\n ? __schedule+0x4b8/0xd00\n ? restore_fpregs_from_fpstate+0x3c/0x90\n ? switch_fpu_return+0x5b/0xe0\n ? do_syscall_64+0x1ef/0x2f0\n ? do_fault+0x2e9/0x540\n ? __handle_mm_fault+0x7d1/0xf70\n ? count_memcg_events+0x167/0x1d0\n ? handle_mm_fault+0x1d7/0x2e0\n ? do_user_addr_fault+0x2c3/0x7f0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe reason is that the stacktrace field is not labeled as such, and is\ntreated as a normal field and not as a dynamic event that it is.\n\nIn trace_event_raw_event_synth() the event is field is still treated as a\ndynamic array, but the retrieval of the data is considered a normal field,\nand the reference is just the meta data:\n\n// Meta data is retrieved instead of a dynamic array\n---truncated---"
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/trace/trace_events_hist.c",
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"kernel/trace/trace_events_synth.c"
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],
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"versions": [
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{
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"version": "00cf3d672a9dd409418647e9f98784c339c3ff63",
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"lessThan": "98ecbfb2598c9c7ca755a29f402da9d36c057077",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "00cf3d672a9dd409418647e9f98784c339c3ff63",
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"lessThan": "327af07dff6ab5650b21491eb4f69694999ff3d1",
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"status": "affected",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "b9453380c1c542fd095a4dbe9251eeba4022bbce",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5f52389bdd9eafb63b3a2f804e02aeb17b6a5f55",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f3baa42afeea0d5f04ad31525e861199d02210cc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5.10.237",
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"lessThan": "5.11",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.15.124",
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"lessThan": "5.16",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.1.43",
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"lessThan": "6.2",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/trace/trace_events_hist.c",
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"kernel/trace/trace_events_synth.c"
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],
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"versions": [
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{
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"version": "6.3",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.3",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.122",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.68",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.8",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.19",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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]
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"references": [
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"url": "https://git.kernel.org/stable/c/98ecbfb2598c9c7ca755a29f402da9d36c057077"
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},
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{
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"url": "https://git.kernel.org/stable/c/327af07dff6ab5650b21491eb4f69694999ff3d1"
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},
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{
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"url": "https://git.kernel.org/stable/c/3b90d099efa2b67239bd3b3dc3521ec584261748"
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},
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{
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"url": "https://git.kernel.org/stable/c/90f9f5d64cae4e72defd96a2a22760173cb3c9ec"
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}
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],
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"title": "tracing: Fix crash on synthetic stacktrace field usage",
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