Skip to content
Heist/ feed
Unrated

arm64: io: Reject non-user protection in ioremap_prot()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: arm64: io: Reject non-user protection in ioremap_prot() Mapping a stack-top page via /dev/mem with PROT_NONE and then reading that process's /proc//cmdline triggers a spurious WARN in ioremap_prot() through generic_access_phys(): WARNING: ./arch/arm64/include/asm/io.h:275 at generic_access_phys Call trace: generic_access_phys+0x1c8/0x228 (P) __access_remote_vm+0x2b4/0x398 access_remote_vm+0x14/0x30 get_mm_cmdline+0xf8/0x2a0 proc_pid_cmdline_read+0x68/0x120 generic_access_phys() passes the protection derived from the user PTE to ioremap_prot(). On arm64, a PROT_NONE mapping is represented by a present-invalid PTE, so pte_present() still returns true and the protection reaches ioremap_prot(). A PROT_NONE mapping does not have PTE_USER, causing the existing WARN_ON_ONCE() in ioremap_prot() to fire even though this is a valid user mapping. Execute-only mappings have the same issue and must not be readable through this path either. ioremap_prot() should therefore reject protection values without PTE_USER without warning. This makes the access fail cleanly for PROT_NONE and execute-only mappings while retaining the existing user-protection contract.

Announced Source revision 1
Original source ↗

CVE-2026-98923

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-2026-98923

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": "64858b76ec67c5fc40fef8ec1841fecb78c1ebde",
        "lessThan": "fddc90d4af4550af410f52d11bbf6b5f36443838",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eeecafce5afffb4da703666ebefbd4d6e2a5abf6",
        "lessThan": "0b04af3d88bb7fc69b2d92457890608860e42365",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3d64dcc0799c2d6921ba027716b7be721eb19fa8",
        "lessThan": "b17aa4955e3a694c663ebe99626e4c76ca4f7cfb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f098037139b294050053123ab2bc0f819d08932",
        "lessThan": "9b583795feb51f8d50203228d001760d1344ef01",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f098037139b294050053123ab2bc0f819d08932",
        "lessThan": "bb756b11ad63832ebee58caf9e8f9381eaecff9f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.6.143",
        "lessThan": "6.6.158",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.12.93",
        "lessThan": "6.12.112",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.18.17",
        "lessThan": "6.18.55",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.19.7",
        "lessThan": "6.20",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "arch/arm64/include/asm/io.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "7.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "7.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "arch/arm64/include/asm/io.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98923

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#52784 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement