CVE-2026-63875 (GCVE-0-2026-63875)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:54 – Updated: 2026-07-20 13:41
VLAI
Title
arm64: tlb: Flush walk cache when unsharing PMD tables
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64: tlb: Flush walk cache when unsharing PMD tables When huge_pmd_unshare() is called to unshare a PMD table, the tlb_unshare_pmd_ptdesc() function sets tlb->unshared_tables=true but the aarch64 tlb_flush() only checked tlb->freed_tables to determine whether to use TLBF_NONE (vae1is, invalidates walk cache) or TLBF_NOWALKCACHE (vale1is, leaf-only). This caused the stale PMD page table entry to remain in the walk cache after unshare, potentially leading to incorrect page table walks. Fix by including unshared_tables in the check, so that when unsharing tables, TLBF_NONE is used and the walk cache is properly invalidated. Here is the detailed distinction between vae1is and vale1is: | Instruction Combination | Actual Invalidation Scope | | ------------------------ | --------------------------------------------------| | `VAE1IS` + TTL=`0` | All entries at all levels (full invalidation) | | `VAE1IS` + TTL=`2` (L2) | Non-leaf at Level 0/1 + leaf at Level 2 | | `VALE1IS` + TTL=`0` | Leaf entries at all levels (non-leaf not cleared) | | `VALE1IS` + TTL=`2` (L2) | Leaf entry at Level 2 only |
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6495204f8219a57859669d618b25d06176d5a872 , < dced308d7d6a0de1c09d2058f38f1aaaf5cbb914 (git)
Affected: ce4cf24761467756462c0e1dbe4a5e9c9eb520fc , < 47490bbb05c8c0e09cc3cfd237d8934ffc340583 (git)
Affected: daa6707b71a2da23a82979fa21f788aeb706f1a2 , < 0199c9d57861f17b556b6cba1f765c7cce79745b (git)
Affected: ff37dd18ce7739a26aab0cc2d31006a45e6bde63 , < d766a49d9b55705c4737cd8bb5d3faa2d31330fd (git)
Affected: da06bb0ca45b1ca6f1ab55023e34e61a520337f3 , < 8ca7284da0e67b3e71d90ec17f08286774245ad9 (git)
Affected: 9b671f6f432be07c0ddd66e437d6d0e0db684f83 , < fe93e907b1af03cc229a80aa64a570a103d2b279 (git)
Affected: 8ce720d5bd91e9dc16db3604aa4b1bf76770a9a1 , < 48125cd9c55cbe297b59fd1f9bda48b0960bd181 (git)
Affected: 8ce720d5bd91e9dc16db3604aa4b1bf76770a9a1 , < c2ff4764e03e7a8d758352f4aceb8fe1be6ac971 (git)
Affected: 5.10.253 , < 5.10.259 (semver)
Affected: 5.15.203 , < 5.15.210 (semver)
Affected: 6.1.167 , < 6.1.176 (semver)
Affected: 6.6.127 , < 6.6.143 (semver)
Affected: 6.12.74 , < 6.12.93 (semver)
Affected: 6.18.13 , < 6.18.35 (semver)
Create a notification for this product.
Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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  }
}



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  • 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.