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CVE-2023-54062

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.2%
Linux•Linux•Versions : 5.10.180, f5cdc6a7339f250d44d4d469ed7a474ac0d6c7a7, 1e9d62d252812575ded7c620d8fc67c32ff06c16, <=6.1.*, <76887be2a96193cd11be818551b8934ecdb3123f, <5.4.243, 6.1.16, <ba04d6af5ac440a6d5a2d35dc1d8e2cb0323550a, <b2fab1807d26acd1c6115b95b5eddd697d84751b, <5.15.112, 0, <=6.3.*, 5.10.173, <6.1.29, 6.4, 4.19.276, 4.14.315, 5.15.112, <f30f3391d089dc91aef91d08f4b04a6c0df2b067, <a18670395e5f28acddeca037c5e4bd2ea961b70a, <6.3, <5.10.180, <=5.10.*, <=4.14.*, 3b28c799a1334adb5a19f42f03abe0d8cbb05938, <b87c7cdf2bed4928b899e1ce91ef0d147017ba45, 6.2.3, 6.3, 8b6d06b3be7648b3b0f428558293ddf6e2cb94bf, <=5.4.*, c7851208abffe5ae4deb01cf48763911dc14fc67, d2efaf8c870c7067b8d1779773134f3481cd8f68, a6744e14ce7045ab1a728bde9595f62fbd39f1d2, 5.15.99, 4.19.283, <=4.19.*, <=6.2.*, 6.3.3, d738789ae9ec47d3458a008788f3cdc862ebf0cb, 5.4.235, <4.14.315, <1a8822343e67432b658145d2760a524c884da9d4, <=*, <=5.15.*, <6.2.16, 6.1.29, 5.4.243, <8beaa3cb293a8f7bacf711cf52201d59859dbc40, 4.14.308, <4.19.283, 6.2.16, <c5fa4eedddd1c8342ce533cb401c0e693e55b4e3

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix invalid free tracking in ext4_xattr_move_to_block() In ext4_xattr_move_to_block(), the value of the extended attribute which we need to move to an external block may be allocated by kvmalloc() if the value is stored in an external inode. So at the end of the function the code tried to check if this was the case by testing entry->e_value_inum. However, at this point, the pointer to the xattr entry is no longer valid, because it was removed from the original location where it had been stored. So we could end up calling kvfree() on a pointer which was not allocated by kvmalloc(); or we could also potentially leak memory by not freeing the buffer when it should be freed. Fix this by storing whether it should be freed in a separate variable.

Gravité et risque d'exploitation

CVE-2023-54062 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 4.9 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 5.10.180, f5cdc6a7339f250d44d4d469ed7a474ac0d6c7a7, 1e9d62d252812575ded7c620d8fc67c32ff06c16, <=6.1.*, <76887be2a96193cd11be818551b8934ecdb3123f, <5.4.243, 6.1.16, <ba04d6af5ac440a6d5a2d35dc1d8e2cb0323550a, <b2fab1807d26acd1c6115b95b5eddd697d84751b, <5.15.112, 0, <=6.3.*, 5.10.173, <6.1.29, 6.4, 4.19.276, 4.14.315, 5.15.112, <f30f3391d089dc91aef91d08f4b04a6c0df2b067, <a18670395e5f28acddeca037c5e4bd2ea961b70a, <6.3, <5.10.180, <=5.10.*, <=4.14.*, 3b28c799a1334adb5a19f42f03abe0d8cbb05938, <b87c7cdf2bed4928b899e1ce91ef0d147017ba45, 6.2.3, 6.3, 8b6d06b3be7648b3b0f428558293ddf6e2cb94bf, <=5.4.*, c7851208abffe5ae4deb01cf48763911dc14fc67, d2efaf8c870c7067b8d1779773134f3481cd8f68, a6744e14ce7045ab1a728bde9595f62fbd39f1d2, 5.15.99, 4.19.283, <=4.19.*, <=6.2.*, 6.3.3, d738789ae9ec47d3458a008788f3cdc862ebf0cb, 5.4.235, <4.14.315, <1a8822343e67432b658145d2760a524c884da9d4, <=*, <=5.15.*, <6.2.16, 6.1.29, 5.4.243, <8beaa3cb293a8f7bacf711cf52201d59859dbc40, 4.14.308, <4.19.283, 6.2.16, <c5fa4eedddd1c8342ce533cb401c0e693e55b4e3) 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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