CVE-2026-63875

Local memory compromise via incomplete TLB invalidation

Published Jul 19, 2026 · Updated Jul 19, 2026

Improper TLB invalidation in the Linux kernel on arm64 allows local users to access stale page-table mappings through hugetlb operations. The aarch64 tlb_flush() path checks freed_tables but ignores unshared_tables, selecting leaf-only invalidation after huge_pmd_unshare() and leaving stale PMD entries in the walk cache. A local low-privileged account with access to shared hugetlb mappings can trigger incorrect translations that expose or modify memory or crash the system.

CVSS severity7.8
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper TLB invalidation in the Linux kernel on arm64 allows local users to access stale page-table mappings through hugetlb operations. The aarch64 tlb_flush() path checks freed_tables but ignores unshared_tables, selecting leaf-only invalidation after huge_pmd_unshare() and leaving stale PMD entries in the walk cache. A local low-privileged account with access to shared hugetlb mappings can trigger incorrect translations that expose or modify memory or crash the system.

The record

CVE
CVE-2026-63875
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.10.253 <5.10.259
  2. Affected versionversion=5.15.203 <5.15.210
  3. Affected versionversion=6.1.167 <6.1.176
  4. Affected versionversion=6.12.74 <6.12.93
  5. Affected versionversion=6.18.13 <6.18.35
  6. Affected versionversion=6.19
  7. Affected versionversion=6495204f8219a57859669d618b25d06176d5a872 <dced308d7d6a0de1c09d2058f38f1aaaf5cbb914
  8. Affected versionversion=6.6.127 <6.6.143
  9. Affected versionversion=8ce720d5bd91e9dc16db3604aa4b1bf76770a9a1 <48125cd9c55cbe297b59fd1f9bda48b0960bd181
  10. Affected versionversion=8ce720d5bd91e9dc16db3604aa4b1bf76770a9a1 <c2ff4764e03e7a8d758352f4aceb8fe1be6ac971
  11. Affected versionversion=9b671f6f432be07c0ddd66e437d6d0e0db684f83 <fe93e907b1af03cc229a80aa64a570a103d2b279
  12. Affected versionversion=ce4cf24761467756462c0e1dbe4a5e9c9eb520fc <47490bbb05c8c0e09cc3cfd237d8934ffc340583
  13. Affected versionversion=da06bb0ca45b1ca6f1ab55023e34e61a520337f3 <8ca7284da0e67b3e71d90ec17f08286774245ad9
  14. Affected versionversion=daa6707b71a2da23a82979fa21f788aeb706f1a2 <0199c9d57861f17b556b6cba1f765c7cce79745b
  15. Affected versionversion=ff37dd18ce7739a26aab0cc2d31006a45e6bde63 <d766a49d9b55705c4737cd8bb5d3faa2d31330fd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.10.253 <5.10.259; version=5.15.203 <5.15.210; version=6.1.167 <6.1.176; version=6.12.74 <6.12.93; version=6.18.13 <6.18.35; version=6.19; version=6495204f8219a57859669d618b25d06176d5a872 <dced308d7d6a0de1c09d2058f38f1aaaf5cbb914; version=6.6.127 <6.6.143; version=8ce720d5bd91e9dc16db3604aa4b1bf76770a9a1 <48125cd9c55cbe297b59fd1f9bda48b0960bd181; version=8ce720d5bd91e9dc16db3604aa4b1bf76770a9a1 <c2ff4764e03e7a8d758352f4aceb8fe1be6ac971; version=9b671f6f432be07c0ddd66e437d6d0e0db684f83 <fe93e907b1af03cc229a80aa64a570a103d2b279; version=ce4cf24761467756462c0e1dbe4a5e9c9eb520fc <47490bbb05c8c0e09cc3cfd237d8934ffc340583; version=da06bb0ca45b1ca6f1ab55023e34e61a520337f3 <8ca7284da0e67b3e71d90ec17f08286774245ad9; version=daa6707b71a2da23a82979fa21f788aeb706f1a2 <0199c9d57861f17b556b6cba1f765c7cce79745b; version=ff37dd18ce7739a26aab0cc2d31006a45e6bde63 <d766a49d9b55705c4737cd8bb5d3faa2d31330fd

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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