vulnerability

Debian: CVE-2022-48985: linux -- security update

Severity
4
CVSS
(AV:L/AC:M/Au:S/C:N/I:N/A:C)
Published
Oct 23, 2024
Added
Oct 23, 2024
Modified
Jan 30, 2025

Description

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

net: mana: Fix race on per-CQ variable napi work_done

After calling napi_complete_done(), the NAPIF_STATE_SCHED bit may be
cleared, and another CPU can start napi thread and access per-CQ variable,
cq->work_done. If the other thread (for example, from busy_poll) sets
it to a value >= budget, this thread will continue to run when it should
stop, and cause memory corruption and panic.

To fix this issue, save the per-CQ work_done variable in a local variable
before napi_complete_done(), so it won't be corrupted by a possible
concurrent thread after napi_complete_done().

Also, add a flag bit to advertise to the NIC firmware: the NAPI work_done
variable race is fixed, so the driver is able to reliably support features
like busy_poll.

Solution

debian-upgrade-linux
Title
NEW

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