CVE-2024-50001

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

State: Published
Severity: 7.8 High
Published: Oct 21, 2024
Updated: Oct 15, 2026
Reserved: Oct 21, 2024

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	5af75c747e2a868abbf8611494b50ed5e076fca7 to before ca36d6c1a49b6965c86dd528a73f38bc62d9c625Affected 5af75c747e2a868abbf8611494b50ed5e076fca7 to before ce828b347cf1b3c1b12b091d02463c35ce5097f5Affected 5af75c747e2a868abbf8611494b50ed5e076fca7 to before fc357e78176945ca7bcacf92ab794b9ccd41b4f4Affected 5af75c747e2a868abbf8611494b50ed5e076fca7 to before 26fad69b34fcba80d5c7d9e651f628e6ac927754Affected 5af75c747e2a868abbf8611494b50ed5e076fca7 to before ecf310aaf256acbc8182189fe0aa1021c3ddef72Affected 5af75c747e2a868abbf8611494b50ed5e076fca7 to before 8bb8c12fb5e2b1f03d603d493c92941676f109b5Affected 5af75c747e2a868abbf8611494b50ed5e076fca7 to before 2bcae12c795f32ddfbf8c80d1b5f1d3286341c32Affected
LinuxLinux	5.10Affected before 5.10Not affected 5.10.227 through 5.10.Not affected 5.15.168 through 5.15.Not affected 6.1.113 through 6.1.Not affected 6.6.55 through 6.6.Not affected 6.10.14 through 6.10.Not affected 6.11.3 through 6.11.Not affected 6.12 and laterNot affected

Product

Versions

LinuxLinux

5af75c747e2a868abbf8611494b50ed5e076fca7 to before ca36d6c1a49b6965c86dd528a73f38bc62d9c625Affected
5af75c747e2a868abbf8611494b50ed5e076fca7 to before ce828b347cf1b3c1b12b091d02463c35ce5097f5Affected
5af75c747e2a868abbf8611494b50ed5e076fca7 to before fc357e78176945ca7bcacf92ab794b9ccd41b4f4Affected
5af75c747e2a868abbf8611494b50ed5e076fca7 to before 26fad69b34fcba80d5c7d9e651f628e6ac927754Affected
5af75c747e2a868abbf8611494b50ed5e076fca7 to before ecf310aaf256acbc8182189fe0aa1021c3ddef72Affected
5af75c747e2a868abbf8611494b50ed5e076fca7 to before 8bb8c12fb5e2b1f03d603d493c92941676f109b5Affected
5af75c747e2a868abbf8611494b50ed5e076fca7 to before 2bcae12c795f32ddfbf8c80d1b5f1d3286341c32Affected

LinuxLinux

5.10Affected
before 5.10Not affected
5.10.227 through 5.10.*Not affected
5.15.168 through 5.15.*Not affected
6.1.113 through 6.1.*Not affected
6.6.55 through 6.6.*Not affected
6.10.14 through 6.10.*Not affected
6.11.3 through 6.11.*Not affected
6.12 and laterNot affected

References

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