CVE-2024-41088

Summary

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

can: mcp251xfd: fix infinite loop when xmit fails

When the mcp251xfd_start_xmit() function fails, the driver stops processing messages, and the interrupt routine does not return, running indefinitely even after killing the running application.

Error messages: [ 441.298819] mcp251xfd spi2.0 can0: ERROR in mcp251xfd_start_xmit: -16 [ 441.306498] mcp251xfd spi2.0 can0: Transmit Event FIFO buffer not empty. (seq=0x000017c7, tef_tail=0x000017cf, tef_head=0x000017d0, tx_head=0x000017d3). … and repeat forever.

The issue can be triggered when multiple devices share the same SPI interface. And there is concurrent access to the bus.

The problem occurs because tx_ring->head increments even if mcp251xfd_start_xmit() fails. Consequently, the driver skips one TX package while still expecting a response in mcp251xfd_handle_tefif_one().

Resolve the issue by starting a workqueue to write the tx obj synchronously if err = -EBUSY. In case of another error, decrement tx_ring->head, remove skb from the echo stack, and drop the message.

[mkl: use more imperative wording in patch description]

Affected Software

VendorProductVersion RangeStatus
LinuxLinux55e5b97f003e85e66babb55f357627d52081a264 < f926c022ebaabf7963bebf89a97201d66978a025affected
LinuxLinux55e5b97f003e85e66babb55f357627d52081a264 < 3e72558c1711d524e3150103739ddd06650e291baffected
LinuxLinux55e5b97f003e85e66babb55f357627d52081a264 < 6c6b4afa59c2fb4d1759235f866d8caed2aa4729affected
LinuxLinux55e5b97f003e85e66babb55f357627d52081a264 < d8fb63e46c884c898a38f061c2330f7729e75510affected
LinuxLinux5.10affected
LinuxLinux0 < 5.10unaffected
LinuxLinux6.1.97 <= 6.1.*unaffected
LinuxLinux6.6.37 <= 6.6.*unaffected
LinuxLinux6.9.8 <= 6.9.*unaffected
LinuxLinux6.10 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References