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CVE-2026-46053: net: rds: fix MR cleanup on copy error

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: net: rds: fix MR cleanup on copy error __rds_rdma_map() hands sg/pages ownership to the transport after get_mr() succeeds. If copying the generated cookie back to user space fails after that point, the error path must not free those resources again before dropping the MR reference. Remove the duplicate unpin/free from the put_user() failure branch so that MR teardown is handled only through the existing final cleanup path.

Affected products

• Linux kernel: from 5.6.1 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.86; from 6.13 before 6.18.27 — fixed in 5.10.258, 5.15.209, 6.1.175, 6.12.86, 6.18.27, 6.6.140

How to fix

Upgrade to a fixed version: Linux kernel 5.10.258, 5.15.209, 6.1.175, 6.12.86. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/033370ffb3c9c0264d19f8ba9ef769523266589a
• https://git.kernel.org/stable/c/106dc689206610cfa2098f593fdd1e020c997835
• https://git.kernel.org/stable/c/8141a2dc70080eda1aedc0389ed2db2b292af5bd
• https://git.kernel.org/stable/c/8fdbb6262a4a3ed44a0830a7793903b54bb27bdc
• https://git.kernel.org/stable/c/91a44b406bc1f9e1c5da0cb7d0d5991b43b79147
• https://git.kernel.org/stable/c/b3cb8cae530b2727d8245684148bb49425f6765c
• https://git.kernel.org/stable/c/d95cea9298be1ba8876e3f156be96d3a492085ca
• https://git.kernel.org/stable/c/ec55a86f7fba7d9111df94b9c11a4755ed492995

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