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openrisc: fix arbitrary kernel memory access via or1k_atomic syscall

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: openrisc: fix arbitrary kernel memory access via or1k_atomic syscall sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user pointers, v1 and v2, and swaps the words they point to in hand-written assembly. l.lwz r29,0(r4) l.lwz r27,0(r5) l.sw 0(r4),r27 l.sw 0(r5),r29 The pointers are not checked with access_ok(). The four memory accesses also have no exception table entries. A caller passes a kernel address as either pointer, and the syscall reads from and writes to it directly. This gives an unprivileged process a kernel read/write primitive. It overwrites kernel data such as the sys_call_table, gaining code execution in kernel context. Check both pointers before entering the critical section. Add fixups for the four memory accesses so faults on valid but unmapped user addresses return -EFAULT. [shorne@gmail.com: fix comment style]

Announced Source revision 1
Original source ↗

CVE-2026-89489

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89489

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
        "lessThan": "bf310718c6fa6adeee06d207a55489546d860e2c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
        "lessThan": "497cba0b02e5555d99fe9ee1dc478af743ab7f7a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
        "lessThan": "1f2e92e499d863f81df1732af59b4a3559969193",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
        "lessThan": "574ae2ac2b314aa33498cd2c28add106cbe644f2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
        "lessThan": "a520e8cac54fb403f3800125b606f55fcad42cb9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
        "lessThan": "d64a75369cd0f2ee79afcc9d9ca34a3890989379",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
        "lessThan": "b53435c079c78f89f70a62dd5a322cca4e292b34",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a",
        "lessThan": "78004e9a87f240df03e2f73120d291763c32e0a7",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "arch/openrisc/kernel/entry.S"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.1"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.1",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "arch/openrisc/kernel/entry.S"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89489

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#35017 · Revision 1
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Publisher date
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