CVE-2025-37800

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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 \u2014 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 \u2014 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 \u2014 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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-37800", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-15T21:45:16.837997Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:52:00.191Z"}}]}}

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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 \u2014 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 \u2014 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 \u2014 either way an oops in the driver-core read path, repeatable at will for a reliable local denial of service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "16574dccd8f62dc1b585325f8a6a0aab10047ed8", "lessThan": "abe56be73eb10a677d16066f65ff9d30251f5eee", "versionType": "git"}, {"status": "affected", "version": "16574dccd8f62dc1b585325f8a6a0aab10047ed8", "lessThan": "2b344e779d9afd0fcb5ee4000e4d0fc7d8d867eb", "versionType": "git"}, {"status": "affected", "version": "16574dccd8f62dc1b585325f8a6a0aab10047ed8", "lessThan": "3781e4b83e174364998855de777e184cf0b62c40", "versionType": "git"}, {"status": "affected", "version": "16574dccd8f62dc1b585325f8a6a0aab10047ed8", "lessThan": "18daa52418e7e4629ed1703b64777294209d2622", "versionType": "git"}], "programFiles": ["drivers/base/base.h", "drivers/base/bus.c", "drivers/base/core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.22"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.22", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.89", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.26", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.14.5", "versionType": "semver", "lessThanOrEqual": "6.14.*"}, {"status": "unaffected", "version": "6.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/base/base.h", "drivers/base/bus.c", "drivers/base/core.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.89", "versionStartIncluding": "2.6.22"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.26", "versionStartIncluding": "2.6.22"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.14.5", "versionStartIncluding": "2.6.22"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.15", "versionStartIncluding": "2.6.22"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:57:39.250Z"}}}, "cveMetadata": {"cveId": "CVE-2025-37800", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:52:00.191Z", "dateReserved": "2025-04-16T04:51:23.941Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-05-08T06:26:01.125Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: n\u00facleo del controlador: se corrige una posible desreferencia de puntero nulo en dev_uevent(). Si el espacio de usuario lee el atributo de dispositivo \"uevent\" al mismo tiempo que otro subproceso desvincula el dispositivo de su controlador, cambiar de un puntero v\u00e1lido a nulo en dev->driver puede provocar un fallo. Se soluciona esto usando READ_ONCE() al obtener el puntero y bloqueando la lista de k de los controladores del bus para garantizar que la instancia del controlador no desaparezca al acceder a ella. Use WRITE_ONCE() al configurar el puntero del controlador para evitar cortes."}], "id": "CVE-2025-37800", "lastModified": "2026-10-15T22:18:18.253", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-37800", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:45:16.837997Z", "version": "2.0.3"}}]}, "published": "2025-05-08T07:15:50.420", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/18daa52418e7e4629ed1703b64777294209d2622"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2b344e779d9afd0fcb5ee4000e4d0fc7d8d867eb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3781e4b83e174364998855de777e184cf0b62c40"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/abe56be73eb10a677d16066f65ff9d30251f5eee"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: driver core: fix potential NULL pointer dereference in dev_uevent()", "id": "2365015", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2365015"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndriver core: fix potential NULL pointer dereference in dev_uevent()\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.\nUse WRITE_ONCE() when setting the driver pointer to ensure there is no\ntearing."], "name": "CVE-2025-37800", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-37800\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37800\nhttps://lore.kernel.org/linux-cve-announce/2025050808-CVE-2025-37800-ea7c@gregkh/T"], "statement": "The attack could happen only during driver unloading. It would not be possible to trigger it without enough privileges to do this, so the security impact is limited. Keeping Moderate level of severity.", "threat_severity": "Moderate"}

{}