CVE-2022-49625

sfc: fix kernel panic when creating VF

Description

In the Linux kernel, the following vulnerability has been resolved: sfc: fix kernel panic when creating VF When creating VFs a kernel panic can happen when calling to efx_ef10_try_update_nic_stats_vf. When releasing a DMA coherent buffer, sometimes, I don't know in what specific circumstances, it has to unmap memory with vunmap. It is disallowed to do that in IRQ context or with BH disabled. Otherwise, we hit this line in vunmap, causing the crash: BUG_ON(in_interrupt()); This patch reenables BH to release the buffer. Log messages when the bug is hit: kernel BUG at mm/vmalloc.c:2727! invalid opcode: 0000 [#1] PREEMPT SMP NOPTI CPU: 6 PID: 1462 Comm: NetworkManager Kdump: loaded Tainted: G I --------- --- 5.14.0-119.el9.x86_64 #1 Hardware name: Dell Inc. PowerEdge R740/06WXJT, BIOS 2.8.2 08/27/2020 RIP: 0010:vunmap+0x2e/0x30 ...skip... Call Trace: __iommu_dma_free+0x96/0x100 efx_nic_free_buffer+0x2b/0x40 [sfc] efx_ef10_try_update_nic_stats_vf+0x14a/0x1c0 [sfc] efx_ef10_update_stats_vf+0x18/0x40 [sfc] efx_start_all+0x15e/0x1d0 [sfc] efx_net_open+0x5a/0xe0 [sfc] __dev_open+0xe7/0x1a0 __dev_change_flags+0x1d7/0x240 dev_change_flags+0x21/0x60 ...skip...

N/A
CVSS
Severity:
EPSS 0.03%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/d9840212a9c00507347c703f4fdeda16400407e0
https://git.kernel.org/stable/c/b9072305270579a9d6afc9b926166231e5b1a7c8
https://git.kernel.org/stable/c/82bcb730f856086f033e6c04082eb4503d4c2fa4
https://git.kernel.org/stable/c/da346adcf5573fd8663cabfdfe8371009629a906
https://git.kernel.org/stable/c/b82e4ad58a7fb72456503958a93060f87896e629
https://git.kernel.org/stable/c/68e5f32f0de9594629ff9e599294d9801c6187de
https://git.kernel.org/stable/c/16662524ec5da801fb78a1afcaf6e782f1cf103a
https://git.kernel.org/stable/c/ada74c5539eba06cf8b47d068f92e0b3963a9a6e

Frequently Asked Questions

What is the severity of CVE-2022-49625?
CVE-2022-49625 has not yet been assigned a CVSS score.
How to fix CVE-2022-49625?
To fix CVE-2022-49625, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-49625 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2022-49625 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-49625?
CVE-2022-49625 affects Linux Linux, Linux Linux.
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