{"id":"CVE-2026-89489","revision":"4d8d524970e546ecad4fdb4d0f6e55d5","records":[{"revision":"4d8d524970e546ecad4fdb4d0f6e55d5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89489","aliases":[],"title":"openrisc: fix arbitrary kernel memory access via or1k_atomic syscall","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nopenrisc: fix arbitrary kernel memory access via or1k_atomic syscall\n\nsys_or1k_atomic() (syscall 244 in the \"or1k\" ABI) takes two user\npointers, v1 and v2, and swaps the words they point to in hand-written\nassembly.\n\n    l.lwz   r29,0(r4)\n    l.lwz   r27,0(r5)\n    l.sw    0(r4),r27\n    l.sw    0(r5),r29\n\nThe pointers are not checked with access_ok(). The four memory\naccesses also have no exception table entries.\n\nA caller passes a kernel address as either pointer, and the syscall\nreads from and writes to it directly.\n\nThis gives an unprivileged process a kernel read/write primitive. It\noverwrites kernel data such as the sys_call_table, gaining code\nexecution in kernel context.\n\nCheck both pointers before entering the critical section. Add fixups\nfor the four memory accesses so faults on valid but unmapped user\naddresses return -EFAULT.\n\n[shorne@gmail.com: fix comment style]","state":0,"publishedAt":"2026-09-11T19:43:42.164+00:00","modifiedAt":"2026-10-19T08:47:40.968+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                        \"arch/openrisc/kernel/entry.S\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\n                            \"lessThan\": \"bf310718c6fa6adeee06d207a55489546d860e2c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\n                            \"lessThan\": \"497cba0b02e5555d99fe9ee1dc478af743ab7f7a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\n                            \"lessThan\": \"1f2e92e499d863f81df1732af59b4a3559969193\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\n                            \"lessThan\": \"574ae2ac2b314aa33498cd2c28add106cbe644f2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\n                            \"lessThan\": \"a520e8cac54fb403f3800125b606f55fcad42cb9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\n                            \"lessThan\": \"d64a75369cd0f2ee79afcc9d9ca34a3890989379\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\n                            \"lessThan\": \"b53435c079c78f89f70a62dd5a322cca4e292b34\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\n                            \"lessThan\": \"78004e9a87f240df03e2f73120d291763c32e0a7\",\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                        \"arch/openrisc/kernel/entry.S\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.1\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\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/bf310718c6fa6adeee06d207a55489546d860e2c","https://git.kernel.org/stable/c/497cba0b02e5555d99fe9ee1dc478af743ab7f7a","https://git.kernel.org/stable/c/1f2e92e499d863f81df1732af59b4a3559969193","https://git.kernel.org/stable/c/574ae2ac2b314aa33498cd2c28add106cbe644f2","https://git.kernel.org/stable/c/a520e8cac54fb403f3800125b606f55fcad42cb9","https://git.kernel.org/stable/c/d64a75369cd0f2ee79afcc9d9ca34a3890989379","https://git.kernel.org/stable/c/b53435c079c78f89f70a62dd5a322cca4e292b34","https://git.kernel.org/stable/c/78004e9a87f240df03e2f73120d291763c32e0a7"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89489","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89489","identifiers":["CVE-2026-89489"]},"retained":false,"historicalAffected":[]}],"coverage":[]}