Heimdall Security Logo

CVE-2022-50476

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <d4460c82177899751975180c268f352893302221, <21296a52caa6a6bad6debdfe40ad81d4f1a27e69, <07e28a8f450217db679802ebd4de0915556ce846, 0, <3.9, <14d245da57a11e80277ab455aa9b6dcc5ed38a19, 4.14.303, <=4.9.*, 4.19.270, <=5.10.*, <=4.14.*, 548c237c0a9972df5d1afaca38aa733ee577128d, <=6.0.*, 5.4.229, <a6b9e09403102bdf8402dae734800e4916c7ea58, 6.0.16, <13286ad1c7c49c606fdcba4cf66f953a1a16c1ca, <=5.4.*, <=4.19.*, 4.9.337, 5.10.163, 5.15.86, <=*, <8b78493968ed3cef0326183ed059c55e42f24d5b, <=5.15.*, 6.1.2, <dd860b39aa7c7b82e6c99b6fdb99d4610ce49d67, <5f7d78b2b12a9d561f48fa00bab29b40f4616dad, 6.2, 3.9

Description

In the Linux kernel, the following vulnerability has been resolved: ntb_netdev: Use dev_kfree_skb_any() in interrupt context TX/RX callback handlers (ntb_netdev_tx_handler(), ntb_netdev_rx_handler()) can be called in interrupt context via the DMA framework when the respective DMA operations have completed. As such, any calls by these routines to free skb's, should use the interrupt context safe dev_kfree_skb_any() function. Previously, these callback handlers would call the interrupt unsafe version of dev_kfree_skb(). This has not presented an issue on Intel IOAT DMA engines as that driver utilizes tasklets rather than a hard interrupt handler, like the AMD PTDMA DMA driver. On AMD systems, a kernel WARNING message is encountered, which is being issued from skb_release_head_state() due to in_hardirq() being true. Besides the user visible WARNING from the kernel, the other symptom of this bug was that TCP/IP performance across the ntb_netdev interface was very poor, i.e. approximately an order of magnitude below what was expected. With the repair to use dev_kfree_skb_any(), kernel WARNINGs from skb_release_head_state() ceased and TCP/IP performance, as measured by iperf, was on par with expected results, approximately 20 Gb/s on AMD Milan based server. Note that this performance is comparable with Intel based servers.

Gravité et risque d'exploitation

CVE-2022-50476 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.16 %, ce qui la place devant 4.7 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <d4460c82177899751975180c268f352893302221, <21296a52caa6a6bad6debdfe40ad81d4f1a27e69, <07e28a8f450217db679802ebd4de0915556ce846, 0, <3.9, <14d245da57a11e80277ab455aa9b6dcc5ed38a19, 4.14.303, <=4.9.*, 4.19.270, <=5.10.*, <=4.14.*, 548c237c0a9972df5d1afaca38aa733ee577128d, <=6.0.*, 5.4.229, <a6b9e09403102bdf8402dae734800e4916c7ea58, 6.0.16, <13286ad1c7c49c606fdcba4cf66f953a1a16c1ca, <=5.4.*, <=4.19.*, 4.9.337, 5.10.163, 5.15.86, <=*, <8b78493968ed3cef0326183ed059c55e42f24d5b, <=5.15.*, 6.1.2, <dd860b39aa7c7b82e6c99b6fdb99d4610ce49d67, <5f7d78b2b12a9d561f48fa00bab29b40f4616dad, 6.2, 3.9) 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

Rechercher une autre CVE