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CVE-2026-64324

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <fdd6229d2ae9914c1f25d1041db0f4f312a4fa76, <=6.12.*, 6.18.39, <335202ab25b01fdd45889ff25eab70864686dea3, 5.15.165, <5.15.212, 0, <=7.1.*, 7.1.4, 097420e48e30f51e8f4f650b5c946f5af63ec1a3, 56e69e59751d20993f243fb7dd6991c4e522424c, <be87de7789a82a030a4896bc7683415ec9fa6f2b, <4.20, 6.1.178, <=5.10.*, <=6.6.*, <6.1.178, 22cc7323f090646c8cfb5939e6f15bdc2ed3fd27, 5.4.282, <5.5, 934f815345c09c290a9b9a9cfdddc203ec2117e8, 5def895b42ef16a2da6402818cba8d7ec8ede1ef, <fb49099206c5c57af28a157249fa7bcb5518f99e, 5.15.212, <b54aee5652fcd7c23a0904a4623ec462c3edc70c, <=6.18.*, <9442d75429b0c556292a7454fe888d54259f5240, 5.10.261, 6.6.145, 5.10.224, <5.10.261, 6.1.105, <6.11, 5cc9745e2ea11aef7d5c9a42bc36f6cd3e1b4cc3, <6.6.145, 6.11, <=*, 4.19.320, <=5.15.*, 05fb2bf477d3fe5421bd4cb699574737f52bd88b, 7c4fa9ebfce69619d132fe703dc2e2cf62a13723, 6.6.46, 6.12.96, 7.2, <12af328d2ee8d68e81ba612246d0b54b22d23e1f, 6.10.5, <5f0419457f89dce1a3f1c8e62a3adf2f39ab8168

Description

In the Linux kernel, the following vulnerability has been resolved: udf: validate free block extents against the partition length udf_free_blocks() checks the logical block number and count against the partition length, but drops the extent offset from that final bound. A crafted extent can pass the guard while logicalBlockNum + offset + count points past the partition, which later indexes past the space bitmap array. A single ftruncate(2) on a file backed by such an extent reliably panics the kernel. This is a local availability issue. On desktop systems where UDisks/polkit allows the active user to mount removable UDF media without CAP_SYS_ADMIN, an unprivileged local user can supply the crafted filesystem and trigger the panic by truncating a writable file on it. Systems that require root or CAP_SYS_ADMIN to mount the image have a higher prerequisite. No confidentiality or integrity impact is claimed: the reproduced primitive is an out-of-bounds read of a bitmap pointer slot followed by a kernel panic. Use the already computed logicalBlockNum + offset + count value for the partition length check. Also make load_block_bitmap() reject an out-of-range block group before indexing s_block_bitmap[], so corrupted callers cannot walk past the flexible array.

Gravité et risque d'exploitation

CVE-2026-64324 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 0.16 %, ce qui la place devant 4.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <fdd6229d2ae9914c1f25d1041db0f4f312a4fa76, <=6.12.*, 6.18.39, <335202ab25b01fdd45889ff25eab70864686dea3, 5.15.165, <5.15.212, 0, <=7.1.*, 7.1.4, 097420e48e30f51e8f4f650b5c946f5af63ec1a3, 56e69e59751d20993f243fb7dd6991c4e522424c, <be87de7789a82a030a4896bc7683415ec9fa6f2b, <4.20, 6.1.178, <=5.10.*, <=6.6.*, <6.1.178, 22cc7323f090646c8cfb5939e6f15bdc2ed3fd27, 5.4.282, <5.5, 934f815345c09c290a9b9a9cfdddc203ec2117e8, 5def895b42ef16a2da6402818cba8d7ec8ede1ef, <fb49099206c5c57af28a157249fa7bcb5518f99e, 5.15.212, <b54aee5652fcd7c23a0904a4623ec462c3edc70c, <=6.18.*, <9442d75429b0c556292a7454fe888d54259f5240, 5.10.261, 6.6.145, 5.10.224, <5.10.261, 6.1.105, <6.11, 5cc9745e2ea11aef7d5c9a42bc36f6cd3e1b4cc3, <6.6.145, 6.11, <=*, 4.19.320, <=5.15.*, 05fb2bf477d3fe5421bd4cb699574737f52bd88b, 7c4fa9ebfce69619d132fe703dc2e2cf62a13723, 6.6.46, 6.12.96, 7.2, <12af328d2ee8d68e81ba612246d0b54b22d23e1f, 6.10.5, <5f0419457f89dce1a3f1c8e62a3adf2f39ab8168) 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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