{"id":"CVE-2026-98027","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size\n\nmv88e6xxx_get_rxnfc() uses rxnfc->rule_cnt as the write index while\ndumping the policy IDR,…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size\n\nmv88e6xxx_get_rxnfc() uses rxnfc->rule_cnt as the write index while\ndumping the policy IDR,…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-787"],"vendor":"Linux","product":"Linux","affected":["Linux >= da7dc87553046a43be1620a783ce3d9f6583d322 < 7e4bfc5f0b66feb22cba821303fc25ca22cd0887","Linux >= da7dc87553046a43be1620a783ce3d9f6583d322 < 01124cd2cf4b71755b1130ac82d78dcfbd5d69e3","Linux >= da7dc87553046a43be1620a783ce3d9f6583d322 < 609c4378f212cf580aae02250f1146caf63d873f","Linux >= da7dc87553046a43be1620a783ce3d9f6583d322 < c5b5c52b6524c9fb50def2260baac745c095ec3a","Linux >= da7dc87553046a43be1620a783ce3d9f6583d322 < 44cd4674d9aa5bdf793b8a8b481c9e8536ed6070","Linux >= da7dc87553046a43be1620a783ce3d9f6583d322 < 7a683c2b062810bca203e41866389daf387c235b","Linux >= da7dc87553046a43be1620a783ce3d9f6583d322 < cda5ac8fe8ac8e80b1703ebb8c4250726fc19739","Linux >= da7dc87553046a43be1620a783ce3d9f6583d322 < b1fffc273112e7284c5b705e186b43b5770cd3d5","Linux 5.4"],"published":"2026-09-25","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:25.783","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98027","references":[{"url":"https://git.kernel.org/stable/c/01124cd2cf4b71755b1130ac82d78dcfbd5d69e3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/44cd4674d9aa5bdf793b8a8b481c9e8536ed6070","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/609c4378f212cf580aae02250f1146caf63d873f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7a683c2b062810bca203e41866389daf387c235b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7e4bfc5f0b66feb22cba821303fc25ca22cd0887","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b1fffc273112e7284c5b705e186b43b5770cd3d5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c5b5c52b6524c9fb50def2260baac745c095ec3a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cda5ac8fe8ac8e80b1703ebb8c4250726fc19739","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98027.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98027"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541198"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98027"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98027"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98027.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00122,"epssPercentile":0.01934,"scores":{"nvd":7,"vendor":5.5,"cna":7},"ingestedAt":"2026-09-25T11:06:38.854Z","slug":"CVE-2026-98027","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size\n\nmv88e6xxx_get_rxnfc() uses rxnfc->rule_cnt as the write index while\ndumping the policy IDR, clobbering the input value before it has been\nlooked at.  That input is the number of entries the caller had room for.\nETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN and the ioctl sizes the\nbuffer from the rule_cnt userspace passes in, so once an admin has\ninstalled policy rules any user can ask for fewer slots than there are\nrules and run off the end of the allocation.  A rule_cnt of 0 leaves the\nbuffer pointer NULL and the walk dereferences it.\n\nCount into a local so the caller's limit survives the walk, and stop with\n-EMSGSIZE once it is reached.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-28 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98027.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":210926,"id":"CVE-2026-98027","ts":1790349116255,"field":"cvss","old":null,"new":"7"},{"seq":210925,"id":"CVE-2026-98027","ts":1790349116255,"field":"severity","old":"none","new":"high"}]}