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CVE-2023-52597

Vulnérabilité moyenne dans Linux (Linux)

CVSS 4.0 · Moyenne
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <0671f42a9c1084db10d68ac347d08dbf6689ecb3, <3.13, <5e63c9ae8055109d805aacdaf2a4fe2c3b371ba1, 0, 6.1.77, 6.8, <732a3bea7aba5b15026ea42d14953c3425cc7dc2, <2823db0010c400e4b2b12d02aa5d0d3ecb15d7c7, <=5.10.*, <=6.6.*, <b988b1bb0053c0dcd26187d29ef07566a565cf55, 5.15.149, <=5.4.*, <=4.19.*, 3.13, 6.6.16, 6.7.4, 4.19.307, 5.4.269, 5.10.210, <=*, <3a04410b0bc7e056e0843ac598825dd359246d18, <=5.15.*, <=6.7.*, <c87d7d910775a025e230fd6359b60627e392460f, 4725c86055f5bbdcdfe47199c0715881893a2c79, <150a3a3871490e8c454ffbac2e60abeafcecff99

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: fix setting of fpc register kvm_arch_vcpu_ioctl_set_fpu() allows to set the floating point control (fpc) register of a guest cpu. The new value is tested for validity by temporarily loading it into the fpc register. This may lead to corruption of the fpc register of the host process: if an interrupt happens while the value is temporarily loaded into the fpc register, and within interrupt context floating point or vector registers are used, the current fp/vx registers are saved with save_fpu_regs() assuming they belong to user space and will be loaded into fp/vx registers when returning to user space. test_fp_ctl() restores the original user space / host process fpc register value, however it will be discarded, when returning to user space. In result the host process will incorrectly continue to run with the value that was supposed to be used for a guest cpu. Fix this by simply removing the test. There is another test right before the SIE context is entered which will handles invalid values. This results in a change of behaviour: invalid values will now be accepted instead of that the ioctl fails with -EINVAL. This seems to be acceptable, given that this interface is most likely not used anymore, and this is in addition the same behaviour implemented with the memory mapped interface (replace invalid values with zero) - see sync_regs() in kvm-s390.c.

Gravité et risque d'exploitation

CVE-2023-52597 obtient un score CVSS de 4.0/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.23 %, ce qui la place devant 13.2 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <0671f42a9c1084db10d68ac347d08dbf6689ecb3, <3.13, <5e63c9ae8055109d805aacdaf2a4fe2c3b371ba1, 0, 6.1.77, 6.8, <732a3bea7aba5b15026ea42d14953c3425cc7dc2, <2823db0010c400e4b2b12d02aa5d0d3ecb15d7c7, <=5.10.*, <=6.6.*, <b988b1bb0053c0dcd26187d29ef07566a565cf55, 5.15.149, <=5.4.*, <=4.19.*, 3.13, 6.6.16, 6.7.4, 4.19.307, 5.4.269, 5.10.210, <=*, <3a04410b0bc7e056e0843ac598825dd359246d18, <=5.15.*, <=6.7.*, <c87d7d910775a025e230fd6359b60627e392460f, 4725c86055f5bbdcdfe47199c0715881893a2c79, <150a3a3871490e8c454ffbac2e60abeafcecff99) 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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