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CVE-2022-48648

Disclosure Date: April 28, 2024
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Description

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]

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CVSS V3 Severity and Metrics
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General Information

Vendors

  • Linux

Products

  • Linux
Technical Analysis