PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-23346 Linux CVE debrief

A vulnerability was found in the Linux kernel, specifically affecting the arm64 architecture. The issue arises from the ioremap_prot() function, which is used to create a kernel mapping of a physical address with specific protection flags. The function was incorrectly returning a user mapping, leading to a fault when accessed from the kernel. This could potentially allow a local attacker to access sensitive information or cause a denial of service.

Vendor
Linux
Product
Unknown
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-03-25
Original CVE updated
2026-06-19
Advisory published
2026-03-25
Advisory updated
2026-06-19

Who should care

Users of the Linux kernel on arm64 architecture should be aware of this vulnerability. Specifically, those using kernel versions between 6.0.1 and 6.18.17, 6.19 and 6.19.7, or 7.0 rc1 through rc7 are affected.

Technical summary

The vulnerability is caused by the ioremap_prot() function incorrectly extracting the memory type from a user 'pgprot_t' value. This results in a new user mapping being returned, which faults when accessed from the kernel. To fix this, the function was modified to extract only the memory type from the user 'pgprot_t' and assert that a user mapping is being passed.

Defensive priority

Medium

Recommended defensive actions

  • Apply the patches provided by the Linux kernel maintainers [ref-4], [ref-5], [ref-6].
  • Update to a kernel version that includes the fix, such as Linux kernel version 6.18.18 or later, 6.19.8 or later, or 7.0 rc8 or later.

Evidence notes

The CVE was published on March 25, 2026, and last modified on June 9, 2026. The vulnerability has a CVSS score of 5.5 and is classified as MEDIUM severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-23346 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-23346

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-23346 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-23346

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/3d64dcc0799c2d6921ba027716b7be721eb19fa8

    416baaa9-dc9f-4396-8d5f-8c081fb06d67 - Patch

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/8f098037139b294050053123ab2bc0f819d08932

    416baaa9-dc9f-4396-8d5f-8c081fb06d67 - Patch

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a

    416baaa9-dc9f-4396-8d5f-8c081fb06d67 - Patch

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/eeecafce5afffb4da703666ebefbd4d6e2a5abf6

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.