{"id":"CVE-2026-23437","revision":"be01e323b60e4ad9a25bedeb27fabde1","records":[{"revision":"be01e323b60e4ad9a25bedeb27fabde1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-23437","aliases":[],"title":"net: shaper: protect late read accesses to the hierarchy","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: shaper: protect late read accesses to the hierarchy\n\nWe look up a netdev during prep of Netlink ops (pre- callbacks)\nand take a ref to it. Then later in the body of the callback\nwe take its lock or RCU which are the actual protections.\n\nThis is not proper, a conversion from a ref to a locked netdev\nmust include a liveness check (a check if the netdev hasn't been\nunregistered already). Fix the read cases (those under RCU).\nWrites needs a separate change to protect from creating the\nhierarchy after flush has already run.","state":0,"publishedAt":"2026-04-03T15:15:22.048+00:00","modifiedAt":"2026-10-19T18:35:43.629+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/shaper/shaper.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4b623f9f0f59652ea71fcb27d60b4c3b65126dbb\",\n                            \"lessThan\": \"581eee0890a8bde44f1fb78ad3e70502a897d583\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4b623f9f0f59652ea71fcb27d60b4c3b65126dbb\",\n                            \"lessThan\": \"348758ba74e6a348299965b16a97cfb817545cc0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4b623f9f0f59652ea71fcb27d60b4c3b65126dbb\",\n                            \"lessThan\": \"0f9ea7141f365b4f27226898e62220fb98ef8dc6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\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/shaper/shaper.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.20\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.10\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/581eee0890a8bde44f1fb78ad3e70502a897d583","https://git.kernel.org/stable/c/348758ba74e6a348299965b16a97cfb817545cc0","https://git.kernel.org/stable/c/0f9ea7141f365b4f27226898e62220fb98ef8dc6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23437","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-23437","identifiers":["CVE-2026-23437"]},"retained":false,"historicalAffected":[]}],"coverage":[]}