180 lines
10 KiB
JSON
180 lines
10 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-2026-99238",
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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": "2026-09-25T10:25:14.403Z",
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"datePublished": "2026-11-02T16:06:42.810Z",
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"dateUpdated": "2026-11-03T19:13:05.949Z"
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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": "2026-11-03T19:13:05.949Z"
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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: Hold trace_types_lock when updating modules in persistent instances\n\ntrace_module_record() walks ftrace_trace_arrays from the module notifier\nwithout trace_types_lock. A concurrent rmdir of an instance removes it\nfrom the list and frees it under that lock, so a module load or unload\ncan walk into a freed trace_array."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - trace_module_record() is reached only from trace_module_notify() on MODULE_STATE_COMING/GOING via load_module()->prepare_coming_module() or delete_module(), i.e. local finit_module/init_module/delete_module or __sock_create()'s request_module(\"net-pf-%d\"). The concurrent free is rmdir(2) on tracefs instances (tracefs_syscall_rmdir()->instance_rmdir()). No protocol message carries the list pointer.\nAC:L - The attacker mkdir()s an instance, then concurrently rmdir()s it so __remove_instance() list_del()+kfree()s the trace_array while another thread loads or unloads a module and trace_module_record() walks ftrace_trace_arrays unlocked. They drive both sides and can retry; a boot/persistent instance is unnecessary because the walk visits every trace_array before checking TRACE_ARRAY_FL_BOOT.\nPR:L - instance_mkdir()/instance_rmdir() (via tracefs_syscall_rmdir) check only VFS DAC on the 0750 instances directory and LOCKDOWN_TRACEFS, not capable(). tracefs_parse_param() uid=/gid= makes a non-root owner of that directory. The COMING notifier also runs after __sock_create()'s request_module(\"net-pf-%d\"), which is not gated by CAP_SYS_MODULE.\nUI:N - The attacker mkdir/rmdir their own /sys/kernel/tracing/instances/<name> and starts the module load or unload (socket() autoload, finit_module, or delete_module) on their own threads. No other user must mount media, open a file, or confirm the action.\nS:U - __remove_instance() kfree()s a host-kernel struct trace_array that trace_module_record() still walks on ftrace_trace_arrays. The resulting heap corruption stays in the tracing subsystem on that host and does not cross a VM, IOMMU, or guest/host boundary.\nC:H - After __remove_instance() kfree()s the kzalloc'd trace_array, trace_module_record() still reads tr->flags and list_for_each_entry follows tr->list.next. Reclaiming that object lets the attacker control those fields and the later tr->scratch/tr->module_delta pointers, which is a use-after-free kernel read.\nI:H - If the reclaimed object's flags include TRACE_ARRAY_FL_BOOT, save_mod() writes mod->name and mod_addr through attacker-controlled tr->scratch; if TRACE_ARRAY_FL_LAST_BOOT is set, make_mod_delta() writes tr->module_delta->delta[]. That use-after-free write is a kernel heap and control-flow primitive.\nA:H - list_for_each_entry on the kfree'd trace_array in trace_module_record(), or save_mod()/make_mod_delta() dereferencing stale tr->scratch, oopses or panics the kernel. The attacker can repeat the rmdir-versus-module-notifier race until that crash hits."
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}
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]
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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.c"
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],
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"versions": [
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{
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"version": "5f3719f697c3fdfae5cd6805f10ac7a04b0f4e43",
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"lessThan": "57408eac99b0d8a005796346d317d31f0ca4e07a",
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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": "5f3719f697c3fdfae5cd6805f10ac7a04b0f4e43",
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"lessThan": "dab2bd4d67ad5eaa95019a9511f8d379401b5021",
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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": "5f3719f697c3fdfae5cd6805f10ac7a04b0f4e43",
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"lessThan": "244c442f54601a24c86ad90572bf36fc3df41c5e",
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"status": "affected",
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},
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{
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"lessThan": "66877a312ae3c2c3d849e82e882f642ffd4ec3e2",
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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.c"
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],
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"versions": [
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{
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"version": "6.15",
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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": "6.15",
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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": "6.18.60",
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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": "7.2.14",
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"lessThanOrEqual": "7.2.*",
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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": "7.3.1",
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"lessThanOrEqual": "7.3.*",
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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": "7.4-rc1",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "6.18.60"
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},
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{
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"vulnerable": true,
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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/57408eac99b0d8a005796346d317d31f0ca4e07a"
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},
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{
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"url": "https://git.kernel.org/stable/c/dab2bd4d67ad5eaa95019a9511f8d379401b5021"
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},
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{
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"url": "https://git.kernel.org/stable/c/244c442f54601a24c86ad90572bf36fc3df41c5e"
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},
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{
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"url": "https://git.kernel.org/stable/c/66877a312ae3c2c3d849e82e882f642ffd4ec3e2"
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}
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],
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"title": "tracing: Hold trace_types_lock when updating modules in persistent instances",
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