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CVE-2026-72193

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <7ac4c86915c24c208a0f0611b71d9676686fe756, b46acd6a6a627d876898e1c84d3f84902264b445, <29b86dbe88cbbef53bb9aaec2e279359f8c450f8, 0, <=7.1.*, 6.1.178, 6.12.97, <=6.6.*, <d313416280d41bea272f02a6034dfa88008692a0, <5.15, 5.15, <=6.18.*, 5.15.212, 6.6.145, <8128bec895075253c779d67afdc90ae513265fca, <9611f644302c07d21bc8af97e3e06a3d30064253, <=*, <=5.15.*, <7972df425687daa70d971fe6ed415e78683133dd, 7.2, <0fad25687d4d3fa1fdd313d31b9cb5817c425029

Description

In the Linux kernel, the following vulnerability has been resolved: ntfs3: cap RESTART_TABLE free-chain walker at rt->used A crafted NTFS3 disk image triggers an in-kernel infinite loop at mount time, hanging the mounting thread and firing the soft-lockup watchdog within ~22s on multi-CPU hosts (panic with kernel.softlockup_panic=1). The bug is reachable from desktop USB auto-mount on distributions where udisks2 routes the NTFS signature to the in-tree ntfs3 driver (Arch family and an increasing fraction of Fedora / openSUSE / RHEL deployments); CAP_SYS_ADMIN-class manual mount elsewhere. check_rstbl()'s second walker iterates the free-entry singly-linked list headed by rt->first_free with no upper bound on iteration count: for (off = ff; off;) { if (off == RESTART_ENTRY_ALLOCATED) return false; off = le32_to_cpu(*(__le32 *)Add2Ptr(rt, off)); if (off > ts - sizeof(__le32)) return false; } The existing guards cover three exits: end-of-list (off == 0), the in-use marker (off == RESTART_ENTRY_ALLOCATED), and out-of-bounds (off > ts - sizeof(__le32)). None of the three prevents an in-bounds cycle. A crafted on-disk RESTART_TABLE whose free chain contains a self-loop or A->B->A cycle whose offsets satisfy: - in range [sizeof(struct RESTART_TABLE), ts - sizeof(__le32)] - (off - sizeof(struct RESTART_TABLE)) % rsize == 0 passes all existing guards and spins the mount-time thread forever. Reproduced in UML by hand-forging a 2 MB NTFS3 image whose journal RESTART_TABLE first_free = 0x18 and whose entry at offset 0x18 stores 0x18 as its next pointer; mount of the forged image with the in-tree ntfs3 driver never returns. Bound the walker by rt->used. Each entry on a legitimate free chain is unique, and the total slot count is ne = le16_to_cpu (rt->used). A traversal that visits more than ne slots is by construction malformed; reject it as a corrupt RESTART_TABLE. After this patch, mount of the forged image returns with -EINVAL and a log_replay failure message, and mkntfs-produced legitimate images mount cleanly (verified in the same UML harness).

Gravité et risque d'exploitation

CVE-2026-72193 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.21 %, ce qui la place devant 11.1 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <7ac4c86915c24c208a0f0611b71d9676686fe756, b46acd6a6a627d876898e1c84d3f84902264b445, <29b86dbe88cbbef53bb9aaec2e279359f8c450f8, 0, <=7.1.*, 6.1.178, 6.12.97, <=6.6.*, <d313416280d41bea272f02a6034dfa88008692a0, <5.15, 5.15, <=6.18.*, 5.15.212, 6.6.145, <8128bec895075253c779d67afdc90ae513265fca, <9611f644302c07d21bc8af97e3e06a3d30064253, <=*, <=5.15.*, <7972df425687daa70d971fe6ed415e78683133dd, 7.2, <0fad25687d4d3fa1fdd313d31b9cb5817c425029) 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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