CVE-2024-50169

Summary

In the Linux kernel, the following vulnerability has been resolved:

vsock: Update rx_bytes on read_skb()

Make sure virtio_transport_inc_rx_pkt() and virtio_transport_dec_rx_pkt() calls are balanced (i.e. virtio_vsock_sock::rx_bytes doesn't lie) after vsock_transport::read_skb().

While here, also inform the peer that we've freed up space and it has more credit.

Failing to update rx_bytes after packet is dequeued leads to a warning on SOCK_STREAM recv():

[ 233.396654] rx_queue is empty, but rx_bytes is non-zero [ 233.396702] WARNING: CPU: 11 PID: 40601 at net/vmw_vsock/virtio_transport_common.c:589

Affected Software

VendorProductVersion RangeStatus
LinuxLinux634f1a7110b439c65fd8a809171c1d2d28bcea6f < 66cd51de31c682a311c2fa25c580b7ea45859dd9affected
LinuxLinux634f1a7110b439c65fd8a809171c1d2d28bcea6f < e5ca2b98090b4bb1c393088c724af6c37812a829affected
LinuxLinux634f1a7110b439c65fd8a809171c1d2d28bcea6f < 3543152f2d330141d9394d28855cb90b860091d2affected
LinuxLinux6.4affected
LinuxLinux0 < 6.4unaffected
LinuxLinux6.6.59 <= 6.6.*unaffected
LinuxLinux6.11.6 <= 6.11.*unaffected
LinuxLinux6.12 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References