221 lines
12 KiB
JSON
221 lines
12 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-2024-38385",
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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": "2024-06-24T13:54:11.033Z",
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"datePublished": "2024-06-25T14:22:37.560Z",
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"dateUpdated": "2026-08-05T11:32:35.260Z"
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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": "2026-08-05T11:32:35.260Z"
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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\ngenirq/irqdesc: Prevent use-after-free in irq_find_at_or_after()\n\nirq_find_at_or_after() dereferences the interrupt descriptor which is\nreturned by mt_find() while neither holding sparse_irq_lock nor RCU read\nlock, which means the descriptor can be freed between mt_find() and the\ndereference:\n\n CPU0 CPU1\n desc = mt_find()\n delayed_free_desc(desc)\n irq_desc_get_irq(desc)\n\nThe use-after-free is reported by KASAN:\n\n Call trace:\n irq_get_next_irq+0x58/0x84\n show_stat+0x638/0x824\n seq_read_iter+0x158/0x4ec\n proc_reg_read_iter+0x94/0x12c\n vfs_read+0x1e0/0x2c8\n\n Freed by task 4471:\n slab_free_freelist_hook+0x174/0x1e0\n __kmem_cache_free+0xa4/0x1dc\n kfree+0x64/0x128\n irq_kobj_release+0x28/0x3c\n kobject_put+0xcc/0x1e0\n delayed_free_desc+0x14/0x2c\n rcu_do_batch+0x214/0x720\n\nGuard the access with a RCU read lock section."
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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 - The vulnerable path is reached by a local `read()` syscall on `/proc/stat` (`show_stat()` → `for_each_active_irq()` → `irq_get_next_irq()`), with no network-facing consumer of this helper.\nAC:L - The attacker fully controls the racing reader and can poll `/proc/stat` continuously at negligible cost, so any concurrent `free_desc()`/`delayed_free_desc()` from routine driver, MSI-X, or hotplug activity is hit without needing to win a timed window; `irq_desc` is a kmalloc'd object whose freed contents are groomable by heap spray.\nPR:L - `/proc/stat` is world-readable, so any unprivileged local account or container process reaches the use-after-free with no capabilities and no namespace tricks required.\nUI:N - The attacker triggers the entire path themselves with a `read()` loop; no victim action or interaction is needed.\nS:U - The stale dereference and its consequences stay entirely within the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - This is a use-after-free read of a reallocated kernel heap object, and the recovered 32-bit value is directly observable from userspace — the count of zero entries `show_irq_gap()` emits before the next IRQ statistic encodes it, leaking freed kernel heap contents.\nI:H - The use-after-free lets the attacker control the freed object's contents through heap grooming and thereby the IRQ index driving `for_each_active_irq()` iteration across genirq, cpuhotplug and io_apic consumers; per UAF scoring this memory-safety violation is treated as exploitable for integrity loss.\nA:H - The stale value makes `i - next` underflow in `show_irq_gap()`, spinning ~268 million `seq_write()` iterations inside a single unprivileged `read()`, and can stall `for_each_active_irq()` from advancing; combined with the UAF itself this yields repeatable soft lockups and oopses."
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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/irq/irqdesc.c"
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],
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"versions": [
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{
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"version": "721255b9826bd11c7a38b585905fc2dd0fb94e52",
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"lessThan": "1c7891812d85500ae2ca4051fa5683fcf29930d8",
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"status": "affected",
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"lessThan": "d084aa022f84319f8079e30882cbcbc026af9f21",
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"status": "affected",
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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/irq/irqdesc.c"
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],
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"versions": [
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{
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"version": "6.5",
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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": "6.5",
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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": "6.6.34",
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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": "6.9.5",
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"lessThanOrEqual": "6.9.*",
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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": "6.10",
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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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"versionStartIncluding": "6.5",
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"versionEndExcluding": "6.6.34"
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"references": [
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"url": "https://git.kernel.org/stable/c/1c7891812d85500ae2ca4051fa5683fcf29930d8"
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"title": "genirq/irqdesc: Prevent use-after-free in irq_find_at_or_after()",
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