{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-37800", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.941Z", "datePublished": "2025-05-08T06:26:01.125Z", "dateUpdated": "2026-08-05T11:57:39.250Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:57:39.250Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndriver core: fix potential NULL pointer dereference in dev_uevent()\n\nIf userspace reads \"uevent\" device attribute at the same time as another\nthreads unbinds the device from its driver, change to dev->driver from a\nvalid pointer to NULL may result in crash. Fix this by using READ_ONCE()\nwhen fetching the pointer, and take bus' drivers klist lock to make sure\ndriver instance will not disappear while we access it.\n\nUse WRITE_ONCE() when setting the driver pointer to ensure there is no\ntearing." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code is reached by read(2) on a sysfs file (`/sys/devices/**/uevent`) and the racing unbind via ioctl on `/dev/bus/usb/*`, both requiring a local account on the system. There is no network-facing path into `dev_uevent()`.\nAC:L - The attacker controls both sides of the race: an unprivileged thread spins reading the world-readable `uevent` attribute while another thread toggles `USBDEVFS_DISCONNECT`/`USBDEVFS_CONNECT` (or CLAIM/RELEASE_INTERFACE) on the same USB interface, driving `dev->driver` between a valid pointer and NULL at will. No condition depends on state outside the attacker's influence, and the window can be retried indefinitely at high rate.\nPR:L - `dev_attr_uevent` is DEVICE_ATTR_RW (0644), so any unprivileged local user can read it, and the usbfs disconnect/connect ioctls have no `capable()` check — only rw access to a `/dev/bus/usb` node, which udev `uaccess` rules routinely grant to the logged-in seat user. No root or capability is required.\nUI:N - The attacker performs both the sysfs read and the driver unbind from their own processes; no victim action is needed. On kiosk-style systems the routine hotplug churn that also triggers it happens without any deliberate user step.\nS:U - The fault and its consequences are confined to the kernel of the same host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - If the driver is unregistered and its module unloaded after the pointer is loaded, `drv->name` is read from freed memory and the resulting dangling `char *` is expanded by `add_uevent_var(env, \"DRIVER=%s\", ...)` into the env buffer that `uevent_show()` copies back to the unprivileged reader — a use-after-free read that leaks arbitrary kernel memory contents to userspace. The fix's klist_drivers lock exists specifically to stop the driver structure disappearing mid-read.\nI:N - The racy path only loads `dev->driver` and formats `drv->name` into a bounded, kernel-allocated uevent buffer; it performs no attacker-influenced write to kernel memory and yields no control-flow hijack primitive.\nA:H - Reloading `dev->driver` as NULL makes `dev->driver->name` a NULL-page dereference, and the freed-module variant faults on unmapped vmalloc memory — either way an oops in the driver-core read path, repeatable at will for a reliable local denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/base/base.h", "drivers/base/bus.c", "drivers/base/core.c" ], "versions": [ { "version": "16574dccd8f62dc1b585325f8a6a0aab10047ed8", "lessThan": "abe56be73eb10a677d16066f65ff9d30251f5eee", "status": "affected", "versionType": "git" }, { "version": "16574dccd8f62dc1b585325f8a6a0aab10047ed8", "lessThan": "2b344e779d9afd0fcb5ee4000e4d0fc7d8d867eb", "status": "affected", "versionType": "git" }, { "version": "16574dccd8f62dc1b585325f8a6a0aab10047ed8", "lessThan": "3781e4b83e174364998855de777e184cf0b62c40", "status": "affected", "versionType": "git" }, { "version": "16574dccd8f62dc1b585325f8a6a0aab10047ed8", "lessThan": "18daa52418e7e4629ed1703b64777294209d2622", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/base/base.h", "drivers/base/bus.c", "drivers/base/core.c" ], "versions": [ { "version": "2.6.22", "status": "affected" }, { "version": "0", "lessThan": "2.6.22", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.89", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.26", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.14.5", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15", "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": "2.6.22", "versionEndExcluding": "6.6.89" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.12.26" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.14.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.15" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/abe56be73eb10a677d16066f65ff9d30251f5eee" }, { "url": "https://git.kernel.org/stable/c/2b344e779d9afd0fcb5ee4000e4d0fc7d8d867eb" }, { "url": "https://git.kernel.org/stable/c/3781e4b83e174364998855de777e184cf0b62c40" }, { "url": "https://git.kernel.org/stable/c/18daa52418e7e4629ed1703b64777294209d2622" } ], "title": "driver core: fix potential NULL pointer dereference in dev_uevent()", "x_generator": { "engine": "bippy-1.2.0" } } } }