CVE-2024-50094

Summary

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

sfc: Don't invoke xdp_do_flush() from netpoll.

Yury reported a crash in the sfc driver originated from netpoll_send_udp(). The netconsole sends a message and then netpoll invokes the driver's NAPI function with a budget of zero. It is dedicated to allow driver to free TX resources, that it may have used while sending the packet.

In the netpoll case the driver invokes xdp_do_flush() unconditionally, leading to crash because bpf_net_context was never assigned.

Invoke xdp_do_flush() only if budget is not zero.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux401cb7dae8130fd34eb84648e02ab4c506df7d5e < 65d4fc76d75c136744e67754d20feda609e7b793affected
LinuxLinux401cb7dae8130fd34eb84648e02ab4c506df7d5e < 55e802468e1d38dec8e25a2fdb6078d45b647e8caffected
LinuxLinux6.11affected
LinuxLinux0 < 6.11unaffected
LinuxLinux6.11.4 <= 6.11.*unaffected
LinuxLinux6.12 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References