CVE-2026-98030

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98030", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:19:56.070Z", "datePublished": "2026-09-25T10:23:46.959Z", "dateUpdated": "2026-10-19T09:12:35.325Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:12:35.325Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: bcm_sf2: bound the CFP rule dump by the caller's buffer size\n\nbcm_sf2_cfp_rule_get_all() walks the whole cfp.unique bitmap into\nrule_locs[] without consulting nfc->rule_cnt, which is how many entries\nthe caller had room for. ETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN\nand the ioctl sizes the buffer from the rule_cnt userspace passes in, so\nonce an admin has installed CFP rules any user can ask for fewer slots\nthan there are rules and run off the end of the allocation. A rule_cnt\nof 0 leaves the buffer pointer NULL and the walk dereferences it."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The trigger is the local SIOCETHTOOL ioctl with ETHTOOL_GRXCLSRLALL on a bcm_sf2 DSA user port. The path is ethtool_get_rxnfc() -> dsa_user_get_rxnfc() -> bcm_sf2_get_rxnfc() -> bcm_sf2_cfp_rule_get_all(). The bad rule_cnt comes from userspace, and no packet from a remote peer is involved.\nAC:H - The overflow needs CFP rules installed beyond the default at bit 0 of cfp.unique, since the walk starts at index 1. Installing them via ETHTOOL_SRXCLSRLINS needs CAP_NET_ADMIN over the switch's netns, so the unprivileged attacker cannot create the rule state. Once rules exist, the bug fires every time.\nPR:L - ETHTOOL_GRXCLSRLALL is on ethtool's no-capability list in net/ethtool/ioctl.c, so any unprivileged local user who can open a socket in the netns holding the DSA port can send the dump request.\nUI:N - The attacker issues the ioctl themselves and picks rule_cnt. No other user has to act.\nS:U - Both the memory corruption and the leak stay inside the kernel's own security authority, with no VM or IOMMU boundary crossed.\nC:H - After the walk, nfc->rule_cnt holds the real rule count, which can be larger than the buffer. ethtool_rxnfc_copy_to_user() then copies rule_cnt*4 bytes from the undersized kcalloc buffer to userspace. That leaks up to about 1 KB of adjacent heap from a slab cache the attacker chooses.\nI:H - bcm_sf2_cfp_rule_get_all() writes u32 rule indices past a kcalloc(rule_cnt) buffer sized by the user. This is a heap out-of-bounds write into neighbouring objects in a slab cache the attacker picks, and it can corrupt kernel data structures.\nA:H - With rule_cnt=0 the rule_locs buffer stays NULL, so the walk writes through a NULL pointer and the kernel oopses. Any user can repeat this at will once rules are installed. Heap corruption from the out-of-bounds write can also crash the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/dsa/bcm_sf2_cfp.c"], "versions": [{"version": "7318166cacad158b46240f66250d7cc5a481653b", "lessThan": "ca49c526291d7cd3a5cb49b0edd7f50a5ae7176e", "status": "affected", "versionType": "git"}, {"version": "7318166cacad158b46240f66250d7cc5a481653b", "lessThan": "8e41ce02589c92356bfd8ef62f6ceff840546e1a", "status": "affected", "versionType": "git"}, {"version": "7318166cacad158b46240f66250d7cc5a481653b", "lessThan": "f2cf4ef2d94fc15fd2e21c131fc1ab3f76125bf4", "status": "affected", "versionType": "git"}, {"version": "7318166cacad158b46240f66250d7cc5a481653b", "lessThan": "f5e93162b3dd195bfda815e8f7a39aaf1d45437b", "status": "affected", "versionType": "git"}, {"version": "7318166cacad158b46240f66250d7cc5a481653b", "lessThan": "f1a2869b3629c0e8394b77b38cb9f19a018c653c", "status": "affected", "versionType": "git"}, {"version": "7318166cacad158b46240f66250d7cc5a481653b", "lessThan": "fd1a78c16b1f6978c09cf048e15f349732e4c707", "status": "affected", "versionType": "git"}, {"version": "7318166cacad158b46240f66250d7cc5a481653b", "lessThan": "b231b6d8516d3fe0d4bba549908e08d26a4531a5", "status": "affected", "versionType": "git"}, {"version": "7318166cacad158b46240f66250d7cc5a481653b", "lessThan": "cdb719f4b8596d9ccee2d56d204c2c4dce982f46", "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/net/dsa/bcm_sf2_cfp.c"], "versions": [{"version": "4.11", "status": "affected"}, {"version": "0", "lessThan": "4.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.7", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "4.11", "versionEndExcluding": "5.10.271"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ca49c526291d7cd3a5cb49b0edd7f50a5ae7176e"}, {"url": "https://git.kernel.org/stable/c/8e41ce02589c92356bfd8ef62f6ceff840546e1a"}, {"url": "https://git.kernel.org/stable/c/f2cf4ef2d94fc15fd2e21c131fc1ab3f76125bf4"}, {"url": "https://git.kernel.org/stable/c/f5e93162b3dd195bfda815e8f7a39aaf1d45437b"}, {"url": "https://git.kernel.org/stable/c/f1a2869b3629c0e8394b77b38cb9f19a018c653c"}, {"url": "https://git.kernel.org/stable/c/fd1a78c16b1f6978c09cf048e15f349732e4c707"}, {"url": "https://git.kernel.org/stable/c/b231b6d8516d3fe0d4bba549908e08d26a4531a5"}, {"url": "https://git.kernel.org/stable/c/cdb719f4b8596d9ccee2d56d204c2c4dce982f46"}], "title": "net: dsa: bcm_sf2: bound the CFP rule dump by the caller's buffer size", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/dsa/bcm_sf2_cfp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ca49c526291d7cd3a5cb49b0edd7f50a5ae7176e", "status": "affected", "version": "7318166cacad158b46240f66250d7cc5a481653b", "versionType": "git"}, {"lessThan": "8e41ce02589c92356bfd8ef62f6ceff840546e1a", "status": "affected", "version": "7318166cacad158b46240f66250d7cc5a481653b", "versionType": "git"}, {"lessThan": "f2cf4ef2d94fc15fd2e21c131fc1ab3f76125bf4", "status": "affected", "version": "7318166cacad158b46240f66250d7cc5a481653b", "versionType": "git"}, {"lessThan": "f5e93162b3dd195bfda815e8f7a39aaf1d45437b", "status": "affected", "version": "7318166cacad158b46240f66250d7cc5a481653b", "versionType": "git"}, {"lessThan": "f1a2869b3629c0e8394b77b38cb9f19a018c653c", "status": "affected", "version": "7318166cacad158b46240f66250d7cc5a481653b", "versionType": "git"}, {"lessThan": "fd1a78c16b1f6978c09cf048e15f349732e4c707", "status": "affected", "version": "7318166cacad158b46240f66250d7cc5a481653b", "versionType": "git"}, {"lessThan": "b231b6d8516d3fe0d4bba549908e08d26a4531a5", "status": "affected", "version": "7318166cacad158b46240f66250d7cc5a481653b", "versionType": "git"}, {"lessThan": "cdb719f4b8596d9ccee2d56d204c2c4dce982f46", "status": "affected", "version": "7318166cacad158b46240f66250d7cc5a481653b", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/dsa/bcm_sf2_cfp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.11"}, {"lessThan": "4.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.271", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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: dsa: bcm_sf2: bound the CFP rule dump by the caller's buffer size\n\nbcm_sf2_cfp_rule_get_all() walks the whole cfp.unique bitmap into\nrule_locs[] without consulting nfc->rule_cnt, which is how many entries\nthe caller had room for. ETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN\nand the ioctl sizes the buffer from the rule_cnt userspace passes in, so\nonce an admin has installed CFP rules any user can ask for fewer slots\nthan there are rules and run off the end of the allocation. A rule_cnt\nof 0 leaves the buffer pointer NULL and the walk dereferences it."}], "id": "CVE-2026-98030", "lastModified": "2026-10-19T10:17:56.990", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-25T11:17:31.673", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8e41ce02589c92356bfd8ef62f6ceff840546e1a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b231b6d8516d3fe0d4bba549908e08d26a4531a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ca49c526291d7cd3a5cb49b0edd7f50a5ae7176e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cdb719f4b8596d9ccee2d56d204c2c4dce982f46"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f1a2869b3629c0e8394b77b38cb9f19a018c653c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f2cf4ef2d94fc15fd2e21c131fc1ab3f76125bf4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f5e93162b3dd195bfda815e8f7a39aaf1d45437b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fd1a78c16b1f6978c09cf048e15f349732e4c707"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net: dsa: bcm_sf2: bound the CFP rule dump by the caller's buffer size", "id": "2541224", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541224"}, "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-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: dsa: bcm_sf2: bound the CFP rule dump by the caller's buffer size\nbcm_sf2_cfp_rule_get_all() walks the whole cfp.unique bitmap into\nrule_locs[] without consulting nfc->rule_cnt, which is how many entries\nthe caller had room for. ETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN\nand the ioctl sizes the buffer from the rule_cnt userspace passes in, so\nonce an admin has installed CFP rules any user can ask for fewer slots\nthan there are rules and run off the end of the allocation. A rule_cnt\nof 0 leaves the buffer pointer NULL and the walk dereferences it.", "A flaw was found in the Linux kernel's Broadcom Starfighter 2 (bcm_sf2) network switch driver. An unprivileged local user can exploit this vulnerability by issuing a network control request to retrieve classification rules while providing a buffer size smaller than the number of active rules. Because the driver does not validate the user-supplied buffer limit, it can write data beyond the allocated memory or dereference a null pointer, leading to kernel memory corruption or a Denial of Service (DoS)."], "name": "CVE-2026-98030", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98030\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98030\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98030.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7318166cacad158b46240f66250d7cc5a481653b,f1a2869b3629c0e8394b77b38cb9f19a018c653c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7318166cacad158b46240f66250d7cc5a481653b,fd1a78c16b1f6978c09cf048e15f349732e4c707)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7318166cacad158b46240f66250d7cc5a481653b,b231b6d8516d3fe0d4bba549908e08d26a4531a5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7318166cacad158b46240f66250d7cc5a481653b,cdb719f4b8596d9ccee2d56d204c2c4dce982f46)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.7,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-25T15:15:14.510606+00:00", "updated": "2026-09-30T14:15:16.122105+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}