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CVE-2026-72369

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.2%
Linux•Linux•Versions : <5.11, 7.1.5, 6.18.40, <=6.12.*, 31fefc18096cdc5549cfa54964d90e0b3229aedc, 0, <8a29e60e2176b02e04f8737c8b32b696230eb0c5, 7.0, <959c95340a9e19cd333b4c18935fdeecbb2f319d, f57ccd4657c7f082dc47e5b9e18a883bb5f9118f, <=7.1.*, 6.12.75, 6.1.165, 6.12.97, <=6.6.*, <abe3536a4bedcc43de80b6d4d7e3d57e9ba382a5, <7.0, 2bb588cede1c1969e49c0a2822c8cb8b346b7682, 1efc128ee4adbc23e082715425ff895449d233bc, <6.20, <6.18.40, <5.16, <=6.18.*, d791c544efd6b9c944b43cf7f502e5bcb02fb941, <6.2, 6.6.145, 6.19.6, 6.6.128, 5.10.252, <a11ebaab50d27d6c4c78506f84ff36452e0b901d, <6.6.145, a051ecf5c5b0387840dc210413ed3bc7fbdaa69c, 8c97a6ddc95690a938ded44b4e3202f03f15078c, 6.18.16, <=*, <6.12.97, 66c7c239c65341f99ae388d4d53dc9df2bcb9925, 5.15.202, 7.2, <fb3e566cafc38fe3ba35e6843a2d529a3748870c

Description

In the Linux kernel, the following vulnerability has been resolved: minix: avoid overflow in bitmap block count calculation minix_check_superblock() uses minix_blocks_needed() to verify that the on-disk imap and zmap block counts are large enough for the advertised inode and zone counts. The helper currently performs DIV_ROUND_UP() in unsigned int arithmetic. A Minix v3 image can set s_ninodes or s_zones near UINT_MAX so the addition inside DIV_ROUND_UP() wraps to zero. That makes a zero imap/zmap block count look valid, after which minix_fill_super() can dereference s_imap[0] or s_zmap[0] even though no bitmap buffers were allocated. Impact: mounting a crafted Minix v3 image whose s_ninodes or s_zones is near UINT_MAX makes minix_check_superblock() accept a zero bitmap-block count and minix_fill_super() dereference s_imap[0]/s_zmap[0], panicking the kernel. The divisor is the bitmap capacity in bits, blocksize * 8, which is always a power of two: minix_fill_super() obtains the block size through sb_set_blocksize(), and blk_validate_block_size() rejects any size that is not a power of two. Use DIV_ROUND_UP_POW2(), which divides before adding the round-up term and so cannot overflow for a power-of-two divisor.

Gravité et risque d'exploitation

CVE-2026-72369 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 6.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <5.11, 7.1.5, 6.18.40, <=6.12.*, 31fefc18096cdc5549cfa54964d90e0b3229aedc, 0, <8a29e60e2176b02e04f8737c8b32b696230eb0c5, 7.0, <959c95340a9e19cd333b4c18935fdeecbb2f319d, f57ccd4657c7f082dc47e5b9e18a883bb5f9118f, <=7.1.*, 6.12.75, 6.1.165, 6.12.97, <=6.6.*, <abe3536a4bedcc43de80b6d4d7e3d57e9ba382a5, <7.0, 2bb588cede1c1969e49c0a2822c8cb8b346b7682, 1efc128ee4adbc23e082715425ff895449d233bc, <6.20, <6.18.40, <5.16, <=6.18.*, d791c544efd6b9c944b43cf7f502e5bcb02fb941, <6.2, 6.6.145, 6.19.6, 6.6.128, 5.10.252, <a11ebaab50d27d6c4c78506f84ff36452e0b901d, <6.6.145, a051ecf5c5b0387840dc210413ed3bc7fbdaa69c, 8c97a6ddc95690a938ded44b4e3202f03f15078c, 6.18.16, <=*, <6.12.97, 66c7c239c65341f99ae388d4d53dc9df2bcb9925, 5.15.202, 7.2, <fb3e566cafc38fe3ba35e6843a2d529a3748870c) 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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