{"id":"CVE-2026-99112","revision":"4bcb8857d39e416a85cc741f9df91001","records":[{"revision":"4bcb8857d39e416a85cc741f9df91001","observedAt":"2026-10-30T13:45:33.454+00:00","statement":{"source":"cve-program","id":"CVE-2026-99112","aliases":[],"title":"net/sched: cls_flower: validate mask pointer after nla_next()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_flower: validate mask pointer after nla_next()\n\nfl_set_enc_opt() iterates the key's nested tunnel-option attributes\nwith nla_for_each_attr() while advancing a single mask pointer via\nnla_next() at the bottom of each loop, so the mask cursor is driven\nby the number of key attributes rather than by the mask's own\nattributes.  The nla_ok() added by commit c96adff956191 (\"cls_flower:\ncall nla_ok() before nla_next()\") only validates the mask pointer\nthat was just consumed; the pointer produced by nla_next() is used by\nthe next iteration (fl_set_geneve_opt() and siblings) without any\nvalidation.\n\nThe mask's nested attributes are validated with NL_VALIDATE_LIBERAL,\nwhich merely warns on trailing bytes that do not form a complete\nattribute.  A mask carrying one valid attribute plus 1-3 residue\nbytes (or a non-aligned attribute length making msk_depth negative)\ntherefore reaches the next iteration with msk_depth != 0, so neither\nthe !msk_depth check in fl_set_enc_opt() nor the !depth check in the\nper-type helpers fires.  nla_type() then reads past the mask payload\nand nla_parse_nested_deprecated() iterates with an nla_len taken\nfrom those bytes, reading well beyond the mask attribute (KASAN:\nslab-out-of-bounds read in __nla_validate_parse from fl_change()).\n\nValidate the advanced mask pointer as well: when the mask is not\nlegitimately exhausted (msk_depth != 0) and the new pointer fails\nnla_ok(), reject the filter with -EINVAL.  An exactly exhausted mask\nstill skips the check, preserving exact-match behaviour for the\nremaining key attributes.","state":0,"publishedAt":"2026-10-28T10:34:29.881+00:00","modifiedAt":"2026-10-30T12:41:50.282+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/cls_flower.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"238b5ebdb6a6e4bc90810b9f8ec0063b3dfda41a\",\n                            \"lessThan\": \"a9283d006eef7e3b56f0f279a49bb63f6e5e61df\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c96adff95619178e2118925578343ad54857c80c\",\n                            \"lessThan\": \"497944d534ffb1be300365523030c7c6517cbbb6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c96adff95619178e2118925578343ad54857c80c\",\n                            \"lessThan\": \"a55d84907337580d91c0d54779d9d4b934633158\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c96adff95619178e2118925578343ad54857c80c\",\n                            \"lessThan\": \"cff9bf34afde46c238189cc6f7690b7e35225df1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c96adff95619178e2118925578343ad54857c80c\",\n                            \"lessThan\": \"35354bf67aa0f7bace66ffb614906124ed50d59d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c96adff95619178e2118925578343ad54857c80c\",\n                            \"lessThan\": \"45e60747a9db2307929260d9aa9c1c6cbb70ee77\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c96adff95619178e2118925578343ad54857c80c\",\n                            \"lessThan\": \"bb187146c7e5c666874784e4f3fc1bc5126e6e92\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c96adff95619178e2118925578343ad54857c80c\",\n                            \"lessThan\": \"fee10655709c5c597e8e9f722f3035d9ea31ff3a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5.10.11\",\n                            \"lessThan\": \"5.10.273\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/cls_flower.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.11\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.273\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.224\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.191\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.161\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.115\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.59\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.13\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/a9283d006eef7e3b56f0f279a49bb63f6e5e61df","https://git.kernel.org/stable/c/497944d534ffb1be300365523030c7c6517cbbb6","https://git.kernel.org/stable/c/a55d84907337580d91c0d54779d9d4b934633158","https://git.kernel.org/stable/c/cff9bf34afde46c238189cc6f7690b7e35225df1","https://git.kernel.org/stable/c/35354bf67aa0f7bace66ffb614906124ed50d59d","https://git.kernel.org/stable/c/45e60747a9db2307929260d9aa9c1c6cbb70ee77","https://git.kernel.org/stable/c/bb187146c7e5c666874784e4f3fc1bc5126e6e92","https://git.kernel.org/stable/c/fee10655709c5c597e8e9f722f3035d9ea31ff3a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99112","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-99112","identifiers":["CVE-2026-99112"]},"retained":false,"historicalAffected":[]}],"coverage":[]}