{"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": "2026-09-25T14:41:54.911Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-25T14:41:54.911Z"}, "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": "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": "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-rc3", "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": "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-rc3"}]}]}], "references": [{"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": "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": "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-rc3", "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": "2026-09-25T15:18:04.627", "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/b231b6d8516d3fe0d4bba549908e08d26a4531a5"}, {"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/fd1a78c16b1f6978c09cf048e15f349732e4c707"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"created": "2026-09-25T15:15:14.510606+00:00", "updated": "2026-09-25T22:30:16.990077+00:00", "vendors": []}