CVE-2026-63875High· 7.8▾ TwilightIn 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->unshar…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
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 |
Linux >= 6495204f8219a57859669d618b25d06176d5a872 < dced308d7d6a0de1c09d2058f38f1aaaf5cbb914Linux >= ce4cf24761467756462c0e1dbe4a5e9c9eb520fc < 47490bbb05c8c0e09cc3cfd237d8934ffc340583Linux >= daa6707b71a2da23a82979fa21f788aeb706f1a2 < 0199c9d57861f17b556b6cba1f765c7cce79745bLinux >= ff37dd18ce7739a26aab0cc2d31006a45e6bde63 < d766a49d9b55705c4737cd8bb5d3faa2d31330fdLinux >= da06bb0ca45b1ca6f1ab55023e34e61a520337f3 < 8ca7284da0e67b3e71d90ec17f08286774245ad9Linux >= 9b671f6f432be07c0ddd66e437d6d0e0db684f83 < fe93e907b1af03cc229a80aa64a570a103d2b279Linux >= 8ce720d5bd91e9dc16db3604aa4b1bf76770a9a1 < 48125cd9c55cbe297b59fd1f9bda48b0960bd181Linux >= 8ce720d5bd91e9dc16db3604aa4b1bf76770a9a1 < c2ff4764e03e7a8d758352f4aceb8fe1be6ac971Linux >= 5.10.253 < 5.10.259Linux >= 5.15.203 < 5.15.210Linux >= 6.1.167 < 6.1.176Linux >= 6.6.127 < 6.6.143Linux >= 6.12.74 < 6.12.93Linux >= 6.18.13 < 6.18.35Linux 6.19Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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