122 lines
7.0 KiB
JSON
122 lines
7.0 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-2026-64451",
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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": "2026-07-19T15:36:31.788Z",
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"datePublished": "2026-07-25T08:51:21.020Z",
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"dateUpdated": "2026-08-17T04:55:55.128Z"
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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": "2026-08-17T04:55:55.128Z"
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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 NULL pointer dereference in func_set_flag()\n\nfunc_set_flag() dereferences tr->current_trace_flags before verifying\nthat the current tracer is actually the function tracer. When the active\ntracer has been switched away from \"function\" (e.g., to \"wakeup_rt\"),\ntr->current_trace_flags can be NULL, leading to a NULL pointer\ndereference and kernel crash.\n\nThe call chain that triggers this is:\n\n trace_options_write()\n -> __set_tracer_option()\n -> trace->set_flag() /* func_set_flag */\n\nIn func_set_flag(), the first operation is:\n\n if (!!set == !!(tr->current_trace_flags->val & bit))\n\nThis dereferences tr->current_trace_flags unconditionally. The safety\ncheck that guards against a non-function tracer:\n\n if (tr->current_trace != &function_trace)\n return 0;\n\nis placed *after* the dereference, which is too late.\n\nThis was observed with the following crash dump:\n\n BUG: unable to handle page fault at 0000000000000000\n RIP: func_set_flag+0xd\n\n Call Trace:\n __set_tracer_option+0x27\n trace_options_write+0x75\n vfs_write+0x12a\n ksys_write+0x66\n do_syscall_64+0x5b\n\n RIP: ffffffff914c973d RSP: ff67ec88b01dfdf0 RFLAGS: 00010202\n RAX: 0000000000000000 RBX: ff3a826e80354580 RCX: 0000000000000001\n RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffffff93918080\n\nThe disassembly confirms the fault:\n\n func_set_flag+0: mov 0x1f08(%rdi), %rax ; RAX = tr->current_trace_flags = NULL\n func_set_flag+13: mov (%rax), %eax ; page fault: dereference NULL\n\nAt the time of the crash:\n tr->current_trace_flags = 0x0 (NULL)\n tr->current_trace = wakeup_rt_tracer (not function_trace)\n\nThe scenario is that a process opens a function tracer option file (such\nas \"func_stack_trace\"), then the current tracer is switched to another\ntracer (e.g., \"wakeup_rt\"), which sets current_trace_flags to NULL. When\nthe process subsequently writes to the option file, func_set_flag() is\ninvoked and crashes on the NULL dereference.\n\nFix this by moving the current_trace check before the\ncurrent_trace_flags dereference, so that func_set_flag() returns early\nwhen the function tracer is not active."
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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_functions.c"
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],
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"versions": [
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{
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"version": "76680d0d2825900f23bf35290ab2b80bdf3a8e4a",
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"lessThan": "69f17ac132a38974cf1defb480cef6b79d1ab768",
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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": "76680d0d2825900f23bf35290ab2b80bdf3a8e4a",
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"lessThan": "c3e94604675e3db186111b8942650d86577df9b0",
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"status": "affected",
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"versionType": "git"
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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_functions.c"
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],
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"versions": [
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{
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"version": "6.19",
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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": "6.19",
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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": "7.1.4",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19",
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"versionEndExcluding": "7.1.4"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19",
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"versionEndExcluding": "7.2"
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}
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]
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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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{
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"url": "https://git.kernel.org/stable/c/69f17ac132a38974cf1defb480cef6b79d1ab768"
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},
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{
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"url": "https://git.kernel.org/stable/c/c3e94604675e3db186111b8942650d86577df9b0"
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}
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],
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"title": "tracing: Fix NULL pointer dereference in func_set_flag()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |