{"id":"CVE-2026-93045","revision":"8de70ca105cd438283dd9ea22b93831d","records":[{"revision":"8de70ca105cd438283dd9ea22b93831d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93045","aliases":[],"title":"bpf: Reject arena frees below the arena base","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject arena frees below the arena base\n\nbpf_arena_free_pages() accepts scalar arena addresses. The runtime\nmasks the address to the low 32 bits and reconstructs a full user\naddress from the arena base before returning the range to the arena\nfree tree.\n\nWhen the scalar value is below the low 32 bits of the arena base,\nfull_uaddr falls below user_vm_start. The existing upper-end clipping\nthen turns this into an out-of-range free-tree offset. A later\nallocation can reuse that offset and return an address below the arena\nmapping.\n\nReject such frees before computing the clipped range.","state":0,"publishedAt":"2026-09-17T16:10:36.988+00:00","modifiedAt":"2026-10-19T09:04:40.316+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                        \"kernel/bpf/arena.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"317460317a02a1af512697e6e964298dedd8a163\",\n                            \"lessThan\": \"90453eaf8f14e7be0ab03983f2a93aeb6b990a58\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"317460317a02a1af512697e6e964298dedd8a163\",\n                            \"lessThan\": \"a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"317460317a02a1af512697e6e964298dedd8a163\",\n                            \"lessThan\": \"8a08635656037aee9c12231ed384449c4ffb1a93\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"317460317a02a1af512697e6e964298dedd8a163\",\n                            \"lessThan\": \"b5a71cb2db6d84ac0042549dcec266b18429d41e\",\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                        \"kernel/bpf/arena.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.9\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\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":[{"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/90453eaf8f14e7be0ab03983f2a93aeb6b990a58","https://git.kernel.org/stable/c/a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20","https://git.kernel.org/stable/c/8a08635656037aee9c12231ed384449c4ffb1a93","https://git.kernel.org/stable/c/b5a71cb2db6d84ac0042549dcec266b18429d41e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93045","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93045","identifiers":["CVE-2026-93045"]},"retained":false,"historicalAffected":[]}],"coverage":[]}