Vulnerability-Lookup

FKIE_CVE-2026-23346

Vulnerability from fkie_nvd - Published: 2026-03-25 11:16 - Updated: 2026-04-24 18:15

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: arm64: io: Extract user memory type in ioremap_prot() The only caller of ioremap_prot() outside of the generic ioremap() implementation is generic_access_phys(), which passes a 'pgprot_t' value determined from the user mapping of the target 'pfn' being accessed by the kernel. On arm64, the 'pgprot_t' contains all of the non-address bits from the pte, including the permission controls, and so we end up returning a new user mapping from ioremap_prot() which faults when accessed from the kernel on systems with PAN: | Unable to handle kernel read from unreadable memory at virtual address ffff80008ea89000 | ... | Call trace: | __memcpy_fromio+0x80/0xf8 | generic_access_phys+0x20c/0x2b8 | __access_remote_vm+0x46c/0x5b8 | access_remote_vm+0x18/0x30 | environ_read+0x238/0x3e8 | vfs_read+0xe4/0x2b0 | ksys_read+0xcc/0x178 | __arm64_sys_read+0x4c/0x68 Extract only the memory type from the user 'pgprot_t' in ioremap_prot() and assert that we're being passed a user mapping, to protect us against any changes in future that may require additional handling. To avoid falsely flagging users of ioremap(), provide our own ioremap() macro which simply wraps __ioremap_prot().

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3d64dcc0799c2d6921ba027716b7be721eb19fa8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8f098037139b294050053123ab2bc0f819d08932	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: io: Extract user memory type in ioremap_prot()\n\nThe only caller of ioremap_prot() outside of the generic ioremap()\nimplementation is generic_access_phys(), which passes a \u0027pgprot_t\u0027 value\ndetermined from the user mapping of the target \u0027pfn\u0027 being accessed by\nthe kernel. On arm64, the \u0027pgprot_t\u0027 contains all of the non-address\nbits from the pte, including the permission controls, and so we end up\nreturning a new user mapping from ioremap_prot() which faults when\naccessed from the kernel on systems with PAN:\n\n  | Unable to handle kernel read from unreadable memory at virtual address ffff80008ea89000\n  | ...\n  | Call trace:\n  |   __memcpy_fromio+0x80/0xf8\n  |   generic_access_phys+0x20c/0x2b8\n  |   __access_remote_vm+0x46c/0x5b8\n  |   access_remote_vm+0x18/0x30\n  |   environ_read+0x238/0x3e8\n  |   vfs_read+0xe4/0x2b0\n  |   ksys_read+0xcc/0x178\n  |   __arm64_sys_read+0x4c/0x68\n\nExtract only the memory type from the user \u0027pgprot_t\u0027 in ioremap_prot()\nand assert that we\u0027re being passed a user mapping, to protect us against\nany changes in future that may require additional handling. To avoid\nfalsely flagging users of ioremap(), provide our own ioremap() macro\nwhich simply wraps __ioremap_prot()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\narm64: io: Extraer el tipo de memoria de usuario en ioremap_prot()\n\nEl \u00fanico llamador de ioremap_prot() fuera de la implementaci\u00f3n gen\u00e9rica de ioremap() es generic_access_phys(), que pasa un valor \u0027pgprot_t\u0027 determinado a partir del mapeo de usuario del \u0027pfn\u0027 objetivo al que accede el kernel. En arm64, el \u0027pgprot_t\u0027 contiene todos los bits no relacionados con la direcci\u00f3n del pte, incluidos los controles de permiso, y as\u00ed terminamos devolviendo un nuevo mapeo de usuario desde ioremap_prot() que falla cuando se accede desde el kernel en sistemas con PAN:\n\n  | No se puede manejar la lectura del kernel desde memoria ilegible en la direcci\u00f3n virtual ffff80008ea89000\n  | ...\n  | Rastro de llamada:\n  |   __memcpy_fromio+0x80/0xf8\n  |   generic_access_phys+0x20c/0x2b8\n  |   __access_remote_vm+0x46c/0x5b8\n  |   access_remote_vm+0x18/0x30\n  |   environ_read+0x238/0x3e8\n  |   vfs_read+0xe4/0x2b0\n  |   ksys_read+0xcc/0x178\n  |   __arm64_sys_read+0x4c/0x68\n\nExtraer solo el tipo de memoria del \u0027pgprot_t\u0027 de usuario en ioremap_prot() y afirmar que se nos est\u00e1 pasando un mapeo de usuario, para protegernos contra cualquier cambio futuro que pueda requerir manejo adicional. Para evitar marcar err\u00f3neamente a los usuarios de ioremap(), proporcionar nuestra propia macro ioremap() que simplemente envuelve a __ioremap_prot()."
    }
  ],
  "id": "CVE-2026-23346",
  "lastModified": "2026-04-24T18:15:05.637",
  "metrics": {
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      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2026-03-25T11:16:32.767",
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}

CVE-2026-23346 (GCVE-0-2026-23346)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-05-11 22:05

Title

arm64: io: Extract user memory type in ioremap_prot()

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/3d64dcc0799c2d692…
https://git.kernel.org/stable/c/d1ad8fe7f72d73e16…
https://git.kernel.org/stable/c/8f098037139b29405…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 893dea9ccd08dab924839354aba21d4ed7a9abc0 , < 3d64dcc0799c2d6921ba027716b7be721eb19fa8 (git) Affected: 893dea9ccd08dab924839354aba21d4ed7a9abc0 , < d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a (git) Affected: 893dea9ccd08dab924839354aba21d4ed7a9abc0 , < 8f098037139b294050053123ab2bc0f819d08932 (git)
Linux	Linux	Affected: 6.0 Unaffected: 0 , < 6.0 (semver) Unaffected: 6.18.17 , ≤ 6.18.* (semver) Unaffected: 6.19.7 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-23346

CVE-2026-23346 (GCVE-0-2026-23346)

Tags

Sightings

Nomenclature