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CVE-2026-63875

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.2%
Linux•Linux•Versions : <6.1.176, <=6.1.*, <=7.0.*, <=6.12.*, 6.12.74, <6.19, <fe93e907b1af03cc229a80aa64a570a103d2b279, 6.12.93, 9b671f6f432be07c0ddd66e437d6d0e0db684f83, <6.6.143, ce4cf24761467756462c0e1dbe4a5e9c9eb520fc, 6.18.13, 0, <6.12.93, 6.18.35, <0199c9d57861f17b556b6cba1f765c7cce79745b, 6.1.176, 5.15.210, daa6707b71a2da23a82979fa21f788aeb706f1a2, da06bb0ca45b1ca6f1ab55023e34e61a520337f3, <47490bbb05c8c0e09cc3cfd237d8934ffc340583, <=5.10.*, <=6.6.*, <5.10.259, <5.15.210, <6.18.35, 5.15.203, 7.1, <=6.18.*, 6.1.167, <d766a49d9b55705c4737cd8bb5d3faa2d31330fd, <c2ff4764e03e7a8d758352f4aceb8fe1be6ac971, 7.0.12, <48125cd9c55cbe297b59fd1f9bda48b0960bd181, 6495204f8219a57859669d618b25d06176d5a872, <8ca7284da0e67b3e71d90ec17f08286774245ad9, 5.10.253, 6.19, <=5.15.*, <=*, ff37dd18ce7739a26aab0cc2d31006a45e6bde63, 6.6.143, <dced308d7d6a0de1c09d2058f38f1aaaf5cbb914, 6.6.127, 5.10.259, 8ce720d5bd91e9dc16db3604aa4b1bf76770a9a1

Description

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 |

Gravité et risque d'exploitation

CVE-2026-63875 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.18 %, ce qui la place devant 6.7 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <6.1.176, <=6.1.*, <=7.0.*, <=6.12.*, 6.12.74, <6.19, <fe93e907b1af03cc229a80aa64a570a103d2b279, 6.12.93, 9b671f6f432be07c0ddd66e437d6d0e0db684f83, <6.6.143, ce4cf24761467756462c0e1dbe4a5e9c9eb520fc, 6.18.13, 0, <6.12.93, 6.18.35, <0199c9d57861f17b556b6cba1f765c7cce79745b, 6.1.176, 5.15.210, daa6707b71a2da23a82979fa21f788aeb706f1a2, da06bb0ca45b1ca6f1ab55023e34e61a520337f3, <47490bbb05c8c0e09cc3cfd237d8934ffc340583, <=5.10.*, <=6.6.*, <5.10.259, <5.15.210, <6.18.35, 5.15.203, 7.1, <=6.18.*, 6.1.167, <d766a49d9b55705c4737cd8bb5d3faa2d31330fd, <c2ff4764e03e7a8d758352f4aceb8fe1be6ac971, 7.0.12, <48125cd9c55cbe297b59fd1f9bda48b0960bd181, 6495204f8219a57859669d618b25d06176d5a872, <8ca7284da0e67b3e71d90ec17f08286774245ad9, 5.10.253, 6.19, <=5.15.*, <=*, ff37dd18ce7739a26aab0cc2d31006a45e6bde63, 6.6.143, <dced308d7d6a0de1c09d2058f38f1aaaf5cbb914, 6.6.127, 5.10.259, 8ce720d5bd91e9dc16db3604aa4b1bf76770a9a1) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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