{"api_version":"1","generated_at":"2026-09-12T04:27:28+00:00","cve":"CVE-2026-89489","urls":{"html":"https://cve.report/CVE-2026-89489","api":"https://cve.report/api/cve/CVE-2026-89489.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89489","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89489"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:30","updated_at":"2026-09-11 20:19:30"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/78004e9a87f240df03e2f73120d291763c32e0a7","name":"https://git.kernel.org/stable/c/78004e9a87f240df03e2f73120d291763c32e0a7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a520e8cac54fb403f3800125b606f55fcad42cb9","name":"https://git.kernel.org/stable/c/a520e8cac54fb403f3800125b606f55fcad42cb9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b53435c079c78f89f70a62dd5a322cca4e292b34","name":"https://git.kernel.org/stable/c/b53435c079c78f89f70a62dd5a322cca4e292b34","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d64a75369cd0f2ee79afcc9d9ca34a3890989379","name":"https://git.kernel.org/stable/c/d64a75369cd0f2ee79afcc9d9ca34a3890989379","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89489","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89489","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a a520e8cac54fb403f3800125b606f55fcad42cb9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a d64a75369cd0f2ee79afcc9d9ca34a3890989379 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a b53435c079c78f89f70a62dd5a322cca4e292b34 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a 78004e9a87f240df03e2f73120d291763c32e0a7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.1","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/openrisc/kernel/entry.S"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a520e8cac54fb403f3800125b606f55fcad42cb9","status":"affected","version":"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a","versionType":"git"},{"lessThan":"d64a75369cd0f2ee79afcc9d9ca34a3890989379","status":"affected","version":"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a","versionType":"git"},{"lessThan":"b53435c079c78f89f70a62dd5a322cca4e292b34","status":"affected","version":"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a","versionType":"git"},{"lessThan":"78004e9a87f240df03e2f73120d291763c32e0a7","status":"affected","version":"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/openrisc/kernel/entry.S"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.1"},{"lessThan":"3.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.109","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.50","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"3.1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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]"}],"providerMetadata":{"dateUpdated":"2026-09-11T19:43:42.164Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a520e8cac54fb403f3800125b606f55fcad42cb9"},{"url":"https://git.kernel.org/stable/c/d64a75369cd0f2ee79afcc9d9ca34a3890989379"},{"url":"https://git.kernel.org/stable/c/b53435c079c78f89f70a62dd5a322cca4e292b34"},{"url":"https://git.kernel.org/stable/c/78004e9a87f240df03e2f73120d291763c32e0a7"}],"title":"openrisc: fix arbitrary kernel memory access via or1k_atomic syscall","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89489","datePublished":"2026-09-11T19:43:42.164Z","dateReserved":"2026-09-11T19:38:34.713Z","dateUpdated":"2026-09-11T19:43:42.164Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:30","lastModifiedDate":"2026-09-11 20:19:30","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89489","Ordinal":"1","Title":"openrisc: fix arbitrary kernel memory access via or1k_atomic sys","CVE":"CVE-2026-89489","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89489","Ordinal":"1","NoteData":"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]","Type":"Description","Title":"openrisc: fix arbitrary kernel memory access via or1k_atomic sys"}]}}}