CVE-2025-40255

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40255", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.181Z", "datePublished": "2025-12-04T16:08:17.023Z", "dateUpdated": "2026-05-11T21:45:47.848Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:45:47.848Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: core: prevent NULL deref in generic_hwtstamp_ioctl_lower()\n\nThe ethtool tsconfig Netlink path can trigger a null pointer\ndereference. A call chain such as:\n\n tsconfig_prepare_data() ->\n dev_get_hwtstamp_phylib() ->\n vlan_hwtstamp_get() ->\n generic_hwtstamp_get_lower() ->\n generic_hwtstamp_ioctl_lower()\n\nresults in generic_hwtstamp_ioctl_lower() being called with\nkernel_cfg->ifr as NULL.\n\nThe generic_hwtstamp_ioctl_lower() function does not expect\na NULL ifr and dereferences it, leading to a system crash.\n\nFix this by adding a NULL check for kernel_cfg->ifr in\ngeneric_hwtstamp_ioctl_lower(). If ifr is NULL, return -EINVAL."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/dev_ioctl.c"], "versions": [{"version": "6e9e2eed4f39d52edf5fd006409d211facf49f6b", "lessThan": "8817f816ae41908e9625c0770c4af0dcdcc01238", "status": "affected", "versionType": "git"}, {"version": "6e9e2eed4f39d52edf5fd006409d211facf49f6b", "lessThan": "f796a8dec9beafcc0f6f0d3478ed685a15c5e062", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/dev_ioctl.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.10", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "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": "6.14", "versionEndExcluding": "6.17.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8817f816ae41908e9625c0770c4af0dcdcc01238"}, {"url": "https://git.kernel.org/stable/c/f796a8dec9beafcc0f6f0d3478ed685a15c5e062"}], "title": "net: core: prevent NULL deref in generic_hwtstamp_ioctl_lower()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/core/dev_ioctl.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8817f816ae41908e9625c0770c4af0dcdcc01238", "status": "affected", "version": "6e9e2eed4f39d52edf5fd006409d211facf49f6b", "versionType": "git"}, {"lessThan": "f796a8dec9beafcc0f6f0d3478ed685a15c5e062", "status": "affected", "version": "6e9e2eed4f39d52edf5fd006409d211facf49f6b", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/core/dev_ioctl.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.17.*", "status": "unaffected", "version": "6.17.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.18", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: core: prevent NULL deref in generic_hwtstamp_ioctl_lower()\n\nThe ethtool tsconfig Netlink path can trigger a null pointer\ndereference. A call chain such as:\n\n tsconfig_prepare_data() ->\n dev_get_hwtstamp_phylib() ->\n vlan_hwtstamp_get() ->\n generic_hwtstamp_get_lower() ->\n generic_hwtstamp_ioctl_lower()\n\nresults in generic_hwtstamp_ioctl_lower() being called with\nkernel_cfg->ifr as NULL.\n\nThe generic_hwtstamp_ioctl_lower() function does not expect\na NULL ifr and dereferences it, leading to a system crash.\n\nFix this by adding a NULL check for kernel_cfg->ifr in\ngeneric_hwtstamp_ioctl_lower(). If ifr is NULL, return -EINVAL."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: core: prevenir desreferencia NULL en generic_hwtstamp_ioctl_lower()\n\nLa ruta Netlink ethtool tsconfig puede desencadenar una desreferencia de puntero nulo. Una cadena de llamadas como:\n\n tsconfig_prepare_data() -> \n dev_get_hwtstamp_phylib() -> \n vlan_hwtstamp_get() -> \n generic_hwtstamp_get_lower() -> \n generic_hwtstamp_ioctl_lower()\n\nresulta en generic_hwtstamp_ioctl_lower() siendo llamada con kernel_cfg -> ifr como NULL.\n\nLa funci\u00f3n generic_hwtstamp_ioctl_lower() no espera un ifr NULL y lo desreferencia, llevando a una ca\u00edda del sistema.\n\nSolucione esto a\u00f1adiendo una comprobaci\u00f3n de NULL para kernel_cfg -> ifr en generic_hwtstamp_ioctl_lower(). Si ifr es NULL, devuelva -EINVAL."}], "id": "CVE-2025-40255", "lastModified": "2026-10-19T19:10:00.130", "metrics": {}, "published": "2025-12-04T16:16:19.227", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8817f816ae41908e9625c0770c4af0dcdcc01238"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f796a8dec9beafcc0f6f0d3478ed685a15c5e062"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: net: core: prevent NULL deref in generic_hwtstamp_ioctl_lower()", "id": "2418890", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2418890"}, "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:\nnet: core: prevent NULL deref in generic_hwtstamp_ioctl_lower()\nThe ethtool tsconfig Netlink path can trigger a null pointer\ndereference. A call chain such as:\ntsconfig_prepare_data() ->\ndev_get_hwtstamp_phylib() ->\nvlan_hwtstamp_get() ->\ngeneric_hwtstamp_get_lower() ->\ngeneric_hwtstamp_ioctl_lower()\nresults in generic_hwtstamp_ioctl_lower() being called with\nkernel_cfg->ifr as NULL.\nThe generic_hwtstamp_ioctl_lower() function does not expect\na NULL ifr and dereferences it, leading to a system crash.\nFix this by adding a NULL check for kernel_cfg->ifr in\ngeneric_hwtstamp_ioctl_lower(). If ifr is NULL, return -EINVAL."], "name": "CVE-2025-40255", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "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": "2025-12-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40255\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40255\nhttps://lore.kernel.org/linux-cve-announce/2025120432-CVE-2025-40255-55aa@gregkh/T"], "threat_severity": "Moderate"}

{}