CVE-2024-50001

Summary

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

net/mlx5: Fix error path in multi-packet WQE transmit

Remove the erroneous unmap in case no DMA mapping was established

The multi-packet WQE transmit code attempts to obtain a DMA mapping for the skb. This could fail, e.g. under memory pressure, when the IOMMU driver just can't allocate more memory for page tables. While the code tries to handle this in the path below the err_unmap label it erroneously unmaps one entry from the sq's FIFO list of active mappings. Since the current map attempt failed this unmap is removing some random DMA mapping that might still be required. If the PCI function now presents that IOVA, the IOMMU may assumes a rogue DMA access and e.g. on s390 puts the PCI function in error state.

The erroneous behavior was seen in a stress-test environment that created memory pressure.

Affected Software

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

CVE Program Container

Additional References

• https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Additional References

• https://cert-portal.siemens.com/productcert/html/ssa-265688.html
• https://cert-portal.siemens.com/productcert/html/ssa-355557.html

References

• https://git.kernel.org/stable/c/ca36d6c1a49b6965c86dd528a73f38bc62d9c625
• https://git.kernel.org/stable/c/ce828b347cf1b3c1b12b091d02463c35ce5097f5
• https://git.kernel.org/stable/c/fc357e78176945ca7bcacf92ab794b9ccd41b4f4
• https://git.kernel.org/stable/c/26fad69b34fcba80d5c7d9e651f628e6ac927754
• https://git.kernel.org/stable/c/ecf310aaf256acbc8182189fe0aa1021c3ddef72
• https://git.kernel.org/stable/c/8bb8c12fb5e2b1f03d603d493c92941676f109b5
• https://git.kernel.org/stable/c/2bcae12c795f32ddfbf8c80d1b5f1d3286341c32

• ←Previous
• Next→