Vulnerability 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...
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.2, < 4.9.324 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/16662524ec5da801fb78a1afcaf6e782f1cf103aPatch
- https://git.kernel.org/stable/c/68e5f32f0de9594629ff9e599294d9801c6187dePatch
- https://git.kernel.org/stable/c/82bcb730f856086f033e6c04082eb4503d4c2fa4Patch
- https://git.kernel.org/stable/c/ada74c5539eba06cf8b47d068f92e0b3963a9a6ePatch
- https://git.kernel.org/stable/c/b82e4ad58a7fb72456503958a93060f87896e629Patch
- https://git.kernel.org/stable/c/b9072305270579a9d6afc9b926166231e5b1a7c8Patch
- https://git.kernel.org/stable/c/d9840212a9c00507347c703f4fdeda16400407e0Patch
- https://git.kernel.org/stable/c/da346adcf5573fd8663cabfdfe8371009629a906Patch
FAQ
What is CVE-2022-49625?
CVE-2022-49625 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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_v...
How severe is CVE-2022-49625?
CVE-2022-49625 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-49625?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.