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CVE-2024-42304

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.2%
Linux•Linux•Versions : 6.10.3, <=6.1.*, <b609753cbbd38f8c0affd4956c0af178348523ac, 6.1.103, 5.15.165, 0, <4.10, <c3893d9de8ee153baac56d127d844103488133b5, <d81d7e347d1f1f48a5634607d39eb90c161c8afe, 4e19d6b65fb4fc42e352ce9883649e049da14743, <f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6, <9771e3d8365ae1dd5e8846a204cb9af14e3e656a, <299bc6ffa57e04e74c6cce866d6c0741fb4897a1, <=5.10.*, <de2a011a13a46468a6e8259db58b1b62071fe136, <=6.6.*, 5021b7a5bdd6bb859eb648c3da71cdd6aae1d133, 514631c2225c1fd556c799cc1893fb27b0f48f00, 5.4.282, 5.3, <=5.4.*, 5.1.21, 7f1f86276515f6816a98f6ca3ef99c827d54642f, 4.9.187, <=4.19.*, <5.3, 5.10.224, 4.14.135, 5.2.4, 6.11, 4.19.62, <=*, 4.19.320, <=5.15.*, <e02f9941e8c011aa3eafa799def6a134ce06bcfa, 6.6.44, 3f0307b0d2d8b333a6964fc4c820dc86896fd1cf, <4.19.320, <4.15, <=6.10.*, <5.2, 3a17ca864baffc0c6f6e8aad525aa4365775a193

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: make sure the first directory block is not a hole The syzbot constructs a directory that has no dirblock but is non-inline, i.e. the first directory block is a hole. And no errors are reported when creating files in this directory in the following flow. ext4_mknod ... ext4_add_entry // Read block 0 ext4_read_dirblock(dir, block, DIRENT) bh = ext4_bread(NULL, inode, block, 0) if (!bh && (type == INDEX || type == DIRENT_HTREE)) // The first directory block is a hole // But type == DIRENT, so no error is reported. After that, we get a directory block without '.' and '..' but with a valid dentry. This may cause some code that relies on dot or dotdot (such as make_indexed_dir()) to crash. Therefore when ext4_read_dirblock() finds that the first directory block is a hole report that the filesystem is corrupted and return an error to avoid loading corrupted data from disk causing something bad.

Gravité et risque d'exploitation

CVE-2024-42304 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 0.23 %, ce qui la place devant 13.4 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 6.10.3, <=6.1.*, <b609753cbbd38f8c0affd4956c0af178348523ac, 6.1.103, 5.15.165, 0, <4.10, <c3893d9de8ee153baac56d127d844103488133b5, <d81d7e347d1f1f48a5634607d39eb90c161c8afe, 4e19d6b65fb4fc42e352ce9883649e049da14743, <f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6, <9771e3d8365ae1dd5e8846a204cb9af14e3e656a, <299bc6ffa57e04e74c6cce866d6c0741fb4897a1, <=5.10.*, <de2a011a13a46468a6e8259db58b1b62071fe136, <=6.6.*, 5021b7a5bdd6bb859eb648c3da71cdd6aae1d133, 514631c2225c1fd556c799cc1893fb27b0f48f00, 5.4.282, 5.3, <=5.4.*, 5.1.21, 7f1f86276515f6816a98f6ca3ef99c827d54642f, 4.9.187, <=4.19.*, <5.3, 5.10.224, 4.14.135, 5.2.4, 6.11, 4.19.62, <=*, 4.19.320, <=5.15.*, <e02f9941e8c011aa3eafa799def6a134ce06bcfa, 6.6.44, 3f0307b0d2d8b333a6964fc4c820dc86896fd1cf, <4.19.320, <4.15, <=6.10.*, <5.2, 3a17ca864baffc0c6f6e8aad525aa4365775a193) 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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