{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-39292", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-21T11:16:40.627Z", "datePublished": "2024-06-24T13:52:26.769Z", "dateUpdated": "2026-08-05T11:33:22.163Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:33:22.163Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\num: Add winch to winch_handlers before registering winch IRQ\n\nRegistering a winch IRQ is racy, an interrupt may occur before the winch is\nadded to the winch_handlers list.\n\nIf that happens, register_winch_irq() adds to that list a winch that is\nscheduled to be (or has already been) freed, causing a panic later in\nwinch_cleanup().\n\nAvoid the race by adding the winch to the winch_handlers list before\nregistering the IRQ, and rolling back if um_request_irq() fails." } ], "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 code is UML console/tty setup reached by opening a UML console or serial device (`/dev/tty*`, `/dev/ttyS*`) inside the guest, i.e. via a local `open()` syscall. Although the `con=port:` telnet channel type can have its setup triggered by an incoming connection, the standard and reliable reach is local.\nAC:L - The attacker creates and repeats the race themselves — closing and reopening the line clears `line->sigio` and re-runs `register_winch_irq()`, so the tiny window between `um_request_irq()` and `list_add()` can be attacked in an unbounded retry loop. Once the early interrupt lands, the freed object stays linked in the global `winch_handlers` list deterministically, and the later dereference is delayed long enough for reliable heap grooming.\nPR:L - No capability or credential check exists anywhere on the path from `open()` through `line_open()` → `line_activate()` → `register_winch_irq()`; only device-node permissions gate it, and a plain unprivileged guest user is sufficient both to open a console/serial line and to spray the `kmalloc-96` slab that reclaims the freed `struct winch`.\nUI:N - Winch registration happens automatically when a configured console line is first opened (including at boot), and the attacker can drive that open themselves. No action by any other user is required.\nS:U - The corruption and its impact are confined to the UML kernel's own memory and the process it already fully controls, which is standard in-kernel privilege escalation. No hypervisor, IOMMU, or sandbox authority boundary is crossed by the vulnerable component.\nC:H - This is a use-after-free on a small, easily reclaimed slab object; the later walk of `winch_handlers` calls `tty_port_tty_get(winch->port)` on an attacker-controlled pointer, giving an arbitrary-dereference read primitive usable to disclose kernel memory.\nI:H - The stale `list_add()` writes two pointers into freed (reclaimable) memory, and the later `free_winch()` performs `free_stack(winch->stack, 0)` on an attacker-controlled address plus a double `kfree()` and `os_kill_process(winch->pid, 1)`, yielding write/free primitives suitable for control-flow hijack.\nA:H - The commit itself states the dangling list entry causes a panic in `winch_cleanup()`, and any use-after-free of this kind reliably produces an oops or kernel panic in the UML instance." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/um/drivers/line.c" ], "versions": [ { "version": "42a359e31a0e438b5b978a8f0fecdbd3c86bb033", "lessThan": "66ea9a7c6824821476914bed21a476cd20094f33", "status": "affected", "versionType": "git" }, { "version": "42a359e31a0e438b5b978a8f0fecdbd3c86bb033", "lessThan": "dc1ff95602ee908fcd7d8acee7a0dadb61b1a0c0", "status": "affected", "versionType": "git" }, { "version": "42a359e31a0e438b5b978a8f0fecdbd3c86bb033", "lessThan": "351d1a64544944b44732f6a64ed65573b00b9e14", "status": "affected", "versionType": "git" }, { "version": "42a359e31a0e438b5b978a8f0fecdbd3c86bb033", "lessThan": "31960d991e43c8d6dc07245f19fc13398e90ead2", "status": "affected", "versionType": "git" }, { "version": "42a359e31a0e438b5b978a8f0fecdbd3c86bb033", "lessThan": "0c02d425a2fbe52643a5859a779db0329e7dddd4", "status": "affected", "versionType": "git" }, { "version": "42a359e31a0e438b5b978a8f0fecdbd3c86bb033", "lessThan": "434a06c38ee1217a8baa0dd7c37cc85d50138fb0", "status": "affected", "versionType": "git" }, { "version": "42a359e31a0e438b5b978a8f0fecdbd3c86bb033", "lessThan": "73b8e21f76c7dda4905655d2e2c17dc5a73b87f1", "status": "affected", "versionType": "git" }, { "version": "42a359e31a0e438b5b978a8f0fecdbd3c86bb033", "lessThan": "a0fbbd36c156b9f7b2276871d499c9943dfe5101", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/um/drivers/line.c" ], "versions": [ { "version": "2.6.23", "status": "affected" }, { "version": "0", "lessThan": "2.6.23", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.316", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.278", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.219", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.161", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.93", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.33", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.4", "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": "2.6.23", "versionEndExcluding": "4.19.316" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "5.4.278" 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"https://git.kernel.org/stable/c/66ea9a7c6824821476914bed21a476cd20094f33" }, { "url": "https://git.kernel.org/stable/c/dc1ff95602ee908fcd7d8acee7a0dadb61b1a0c0" }, { "url": "https://git.kernel.org/stable/c/351d1a64544944b44732f6a64ed65573b00b9e14" }, { "url": "https://git.kernel.org/stable/c/31960d991e43c8d6dc07245f19fc13398e90ead2" }, { "url": "https://git.kernel.org/stable/c/0c02d425a2fbe52643a5859a779db0329e7dddd4" }, { "url": "https://git.kernel.org/stable/c/434a06c38ee1217a8baa0dd7c37cc85d50138fb0" }, { "url": "https://git.kernel.org/stable/c/73b8e21f76c7dda4905655d2e2c17dc5a73b87f1" }, { "url": "https://git.kernel.org/stable/c/a0fbbd36c156b9f7b2276871d499c9943dfe5101" } ], "title": "um: Add winch to winch_handlers before registering winch IRQ", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-24T15:15:10.639136Z", "id": "CVE-2024-39292", "options": [ { "Exploitation": "none" }, { "Automatable": 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"tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/73b8e21f76c7dda4905655d2e2c17dc5a73b87f1", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/a0fbbd36c156b9f7b2276871d499c9943dfe5101", "tags": [ "x_transferred" ] }, { "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-04T17:21:58.690Z" } } ] }, "dataVersion": "5.2" }