CVE-2026-72195

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, b46acd6a6a627d876898e1c84d3f84902264b445, 0, <=7.1.*, <50b5e83384e7fed3d11d18b79ff350e9d6d89861, <97758fd9756b5f09e9ddc6a5f6a569041acc8421, 6.1.178, 6.12.97, <=6.6.*, <5.15, <d1570c48f49a693974d000251030370ee2e83539, <a89c66674283a0293c0f266dc57087a6114371a3, 5.15, <=6.18.*, 5.15.212, 6.6.145, <53c12f178f584dc5f836ffe2782138a6e9348ed9, <546518468e6c9ea469669eef78f8cc380ad6e2ca, <=*, <=5.15.*, <ab8761676d638c5be170aaf91b7ffdd451236616, 7.2

Description

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound attr_off in UpdateResidentValue against data_off In do_action()'s UpdateResidentValue case (fslog.c:3307), lrh->attr_off and lrh->redo_len come from the on-disk LRH. When they satisfy aoff + dlen < attr->res.data_off, the assignment attr->res.data_size = cpu_to_le32(aoff + dlen - data_off); underflows to ~4 GiB (e.g. 0xFFFFFFF9 when aoff=0x10, dlen=1, data_off=0x18). Subsequent code that reads attr->res.data_size to walk the resident attribute payload would then read up to 4 GiB past the 1024-byte MFT record allocation. The existing mi_enum_attr() defense in fs/ntfs3/record.c:287 catches the corrupted data_size on the next attribute walk and fails the mount, but only on the path that walks all attributes. A read site that picks an attribute by name and reads its data_size without re-validating is not covered. Validate aoff against data_off and asize at the source. Reproduced under UML+KASAN on mainline 8d90b09e6741 via pr_warn-only probe: with aoff=0x10 and data_off=0x18, the post-assignment data_size is 0xfffffff9 (mount then fails at -22 from mi_enum_attr). [almaz.alexandrovich@paragon-software.com: clang-formatted the changes]

Gravité et risque d'exploitation

CVE-2026-72195 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 0.17 %, ce qui la place devant 5.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, b46acd6a6a627d876898e1c84d3f84902264b445, 0, <=7.1.*, <50b5e83384e7fed3d11d18b79ff350e9d6d89861, <97758fd9756b5f09e9ddc6a5f6a569041acc8421, 6.1.178, 6.12.97, <=6.6.*, <5.15, <d1570c48f49a693974d000251030370ee2e83539, <a89c66674283a0293c0f266dc57087a6114371a3, 5.15, <=6.18.*, 5.15.212, 6.6.145, <53c12f178f584dc5f836ffe2782138a6e9348ed9, <546518468e6c9ea469669eef78f8cc380ad6e2ca, <=*, <=5.15.*, <ab8761676d638c5be170aaf91b7ffdd451236616, 7.2) 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