CVE-2022-48648

Summary

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

sfc: fix null pointer dereference in efx_hard_start_xmit

Trying to get the channel from the tx_queue variable here is wrong because we can only be here if tx_queue is NULL, so we shouldn't dereference it. As the above comment in the code says, this is very unlikely to happen, but it's wrong anyway so let's fix it.

I hit this issue because of a different bug that caused tx_queue to be NULL. If that happens, this is the error message that we get here: BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 […] RIP: 0010:efx_hard_start_xmit+0x153/0x170 [sfc]

Affected Software

VendorProductVersion RangeStatus
LinuxLinux12804793b17c0e19115a90d98f2f3df0cb79e233 < b3b41d4d95d3822b2e459ecbc80d030ea6aec5e7affected
LinuxLinux12804793b17c0e19115a90d98f2f3df0cb79e233 < 8547c7bfc0617e7184e4da65b9b96681fcfe9998affected
LinuxLinux12804793b17c0e19115a90d98f2f3df0cb79e233 < b3b952168ee1f220ba729fa100fd9d5aa752eb03affected
LinuxLinux12804793b17c0e19115a90d98f2f3df0cb79e233 < 0a242eb2913a4aa3d6fbdb86559f27628e9466f3affected
LinuxLinux5.10affected
LinuxLinux0 < 5.10unaffected
LinuxLinux5.10.146 <= 5.10.*unaffected
LinuxLinux5.15.71 <= 5.15.*unaffected
LinuxLinux5.19.12 <= 5.19.*unaffected
LinuxLinux6.0 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References