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vuln-cve/data/2026/89xxx/CVE-2026-89489.json
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{
"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"
}
}
}
}
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