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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...
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 26, 2025 |
| Ubuntu | — | Upgrade linux-iotUpgrade linux-hwe-5.4Upgrade linux-oracle-5.4Upgrade linux-gcp-4.15Upgrade linux-aws-hweUpgrade linux-oracle-5.15Upgrade linux-gkeopUpgrade linux-azure-5.4Upgrade linux-ibm-5.4Upgrade linux-gkeUpgrade linux-azure-4.15Upgrade linux-ibmUpgrade linux-awsUpgrade linux-azure-5.15Upgrade linux-aws-fipsUpgrade linux-aws-5.4Upgrade linux-azure-fipsUpgrade linux-hwe-5.15Upgrade linux-azureUpgrade linux-lowlatencyUpgrade linuxUpgrade linux-gcp-5.4Upgrade linux-raspiUpgrade linux-intel-iotgUpgrade linux-kvmUpgrade linux-lowlatency-hwe-5.15Upgrade linux-gcp-fipsUpgrade linux-bluefieldUpgrade linux-nvidiaUpgrade linux-gcp-5.15Upgrade linux-azure-fdeUpgrade linux-fipsUpgrade linux-realtimeUpgrade linux-hweUpgrade linux-raspi-5.4Upgrade linux-oracleUpgrade linux-intel-iotg-5.15Upgrade linux-gcpUpgrade linux-aws-5.15Upgrade linux-riscv-5.15 | Mar 3, 2025 | Feb 26, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Feb 26, 2025 |
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