{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-38385", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-24T13:54:11.033Z", "datePublished": "2024-06-25T14:22:37.560Z", "dateUpdated": "2026-08-05T11:32:35.260Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:32:35.260Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/irq/irqdesc.c" ], "versions": [ { "version": "721255b9826bd11c7a38b585905fc2dd0fb94e52", "lessThan": "1c7891812d85500ae2ca4051fa5683fcf29930d8", "status": "affected", "versionType": "git" }, { "version": "721255b9826bd11c7a38b585905fc2dd0fb94e52", "lessThan": "d084aa022f84319f8079e30882cbcbc026af9f21", "status": "affected", "versionType": "git" }, { "version": "721255b9826bd11c7a38b585905fc2dd0fb94e52", "lessThan": "b84a8aba806261d2f759ccedf4a2a6a80a5e55ba", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/irq/irqdesc.c" ], "versions": [ { "version": "6.5", "status": "affected" }, { "version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.34", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.5", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.6.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.9.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1c7891812d85500ae2ca4051fa5683fcf29930d8" }, { "url": "https://git.kernel.org/stable/c/d084aa022f84319f8079e30882cbcbc026af9f21" }, { "url": "https://git.kernel.org/stable/c/b84a8aba806261d2f759ccedf4a2a6a80a5e55ba" } ], "title": "genirq/irqdesc: Prevent use-after-free in irq_find_at_or_after()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T04:04:25.138Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/1c7891812d85500ae2ca4051fa5683fcf29930d8", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/d084aa022f84319f8079e30882cbcbc026af9f21", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/b84a8aba806261d2f759ccedf4a2a6a80a5e55ba", "tags": [ "x_transferred" ] } ] }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-38385", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T17:08:17.872806Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:34:42.745Z" } } ] } }