CVE-2026-89489

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89489", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.713Z", "datePublished": "2026-09-11T19:43:42.164Z", "dateUpdated": "2026-10-19T08:47:40.968Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:47:40.968Z"}, "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]"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - sys_or1k_atomic (syscall 244) is reached only via a local OpenRISC syscall into _sys_call_handler and sys_call_table; there is no network, adjacent-wireless, or physical-device path to the unchecked loads/stores in arch/openrisc/kernel/entry.S.\nAC:L - The attacker fully controls both pointer arguments and the swap is deterministic with no race or KASLR (OpenRISC has none); a published unprivileged PoC on qemu-system-or1k overwrote sys_call_table[174] and obtained uid=0 on every run.\nPR:L - Any unprivileged local process can invoke syscall 244; the handler performs no capable()/ns_capable() check, authentication, or init-namespace root gate before dereferencing the caller-supplied pointers.\nUI:N - The attacking process issues or1k_atomic itself with crafted kernel addresses; no other user must mount a filesystem, open a device, or otherwise interact.\nS:U - This is a standard host-kernel privilege escalation (arbitrary kernel R/W and commit_creds via a hijacked syscall); it does not cross a VM guest/host, IOMMU, or other security-authority boundary.\nC:H - The syscall atomically swaps two 32-bit words at attacker-chosen addresses with no access_ok(), so pairing a kernel pointer with a userspace buffer yields an arbitrary kernel-memory read primitive of any mapped word.\nI:H - The same swap is an arbitrary kernel write; the fix commit documents overwriting sys_call_table to run commit_creds(init_cred) and gain root, i.e. control-flow hijacking and full integrity compromise.\nA:H - Writes to unmapped or critical kernel addresses oops or panic because the original accesses had no exception-table fixups, and corrupting kernel text, data, or the syscall table can hang or crash the machine even without a full root exploit."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/openrisc/kernel/entry.S"], "versions": [{"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a", "lessThan": "bf310718c6fa6adeee06d207a55489546d860e2c", "status": "affected", "versionType": "git"}, {"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a", "lessThan": "497cba0b02e5555d99fe9ee1dc478af743ab7f7a", "status": "affected", "versionType": "git"}, {"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a", "lessThan": "1f2e92e499d863f81df1732af59b4a3559969193", "status": "affected", "versionType": "git"}, {"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a", "lessThan": "574ae2ac2b314aa33498cd2c28add106cbe644f2", "status": "affected", "versionType": "git"}, {"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a", "lessThan": "a520e8cac54fb403f3800125b606f55fcad42cb9", "status": "affected", "versionType": "git"}, {"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a", "lessThan": "d64a75369cd0f2ee79afcc9d9ca34a3890989379", "status": "affected", "versionType": "git"}, {"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a", "lessThan": "b53435c079c78f89f70a62dd5a322cca4e292b34", "status": "affected", "versionType": "git"}, {"version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a", "lessThan": "78004e9a87f240df03e2f73120d291763c32e0a7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/openrisc/kernel/entry.S"], "versions": [{"version": "3.1", "status": "affected"}, {"version": "0", "lessThan": "3.1", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/bf310718c6fa6adeee06d207a55489546d860e2c"}, {"url": "https://git.kernel.org/stable/c/497cba0b02e5555d99fe9ee1dc478af743ab7f7a"}, {"url": "https://git.kernel.org/stable/c/1f2e92e499d863f81df1732af59b4a3559969193"}, {"url": "https://git.kernel.org/stable/c/574ae2ac2b314aa33498cd2c28add106cbe644f2"}, {"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"}}}}

{}

{"affected": [{"affectedData": [{"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": "bf310718c6fa6adeee06d207a55489546d860e2c", "status": "affected", "version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a", "versionType": "git"}, {"lessThan": "497cba0b02e5555d99fe9ee1dc478af743ab7f7a", "status": "affected", "version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a", "versionType": "git"}, {"lessThan": "1f2e92e499d863f81df1732af59b4a3559969193", "status": "affected", "version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a", "versionType": "git"}, {"lessThan": "574ae2ac2b314aa33498cd2c28add106cbe644f2", "status": "affected", "version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a", "versionType": "git"}, {"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": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "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", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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]"}], "id": "CVE-2026-89489", "lastModified": "2026-10-19T09:17:42.653", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:19:30.683", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1f2e92e499d863f81df1732af59b4a3559969193"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/497cba0b02e5555d99fe9ee1dc478af743ab7f7a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/574ae2ac2b314aa33498cd2c28add106cbe644f2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/78004e9a87f240df03e2f73120d291763c32e0a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a520e8cac54fb403f3800125b606f55fcad42cb9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b53435c079c78f89f70a62dd5a322cca4e292b34"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bf310718c6fa6adeee06d207a55489546d860e2c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d64a75369cd0f2ee79afcc9d9ca34a3890989379"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Arbitrary code execution via or1k_atomic syscall", "id": "2532099", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532099"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-822", "details": ["A flaw was found in the Linux kernel. The `sys_or1k_atomic()` syscall, specific to the openrisc architecture, does not adequately validate user-provided pointers. An unprivileged process can exploit this by supplying kernel addresses to the syscall, gaining unauthorized read and write access to kernel memory. This vulnerability allows an attacker to overwrite critical kernel data, potentially leading to arbitrary code execution with elevated privileges."], "name": "CVE-2026-89489", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-11T19:43:42Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89489\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89489\nhttps://git.kernel.org/stable/c/78004e9a87f240df03e2f73120d291763c32e0a7\nhttps://git.kernel.org/stable/c/a520e8cac54fb403f3800125b606f55fcad42cb9\nhttps://git.kernel.org/stable/c/b53435c079c78f89f70a62dd5a322cca4e292b34\nhttps://git.kernel.org/stable/c/d64a75369cd0f2ee79afcc9d9ca34a3890989379"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a,a520e8cac54fb403f3800125b606f55fcad42cb9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a,b53435c079c78f89f70a62dd5a322cca4e292b34)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a,d64a75369cd0f2ee79afcc9d9ca34a3890989379)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a,78004e9a87f240df03e2f73120d291763c32e0a7)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T02:45:06.765609+00:00", "updated": "2026-09-15T22:45:07.204652+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}