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CVE-2026-98524

rds: ib: Clear the sg list when mapping an MR fails

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: rds: ib: Clear the sg list when mapping an MR fails rds_ib_map_frmr() stores the caller's scatterlist in the MR before DMA mapping and registration can fail. On failure, __rds_rdma_map() unpins the pages and frees the scatterlist, but rds_ib_free_frmr() can still return the MR to the pool with the stale pointer set. This leaves the pool with a dangling scatterlist and can lead to local privilege escalation. KASAN detects the resulting use-after-free when the MR is later torn down: BUG: KASAN: slab-use-after-free in __rds_ib_teardown_mr Read of size 8 Call Trace: __rds_ib_teardown_mr rds_ib_unreg_frmr rds_ib_flush_mr_pool rds_ib_flush_mrs rds_free_mr rds_setsockopt Store the scatterlist in the MR only after DMA mapping succeeds. If DMA mapping fails, return directly while the MR fields remain clear; the caller keeps ownership of the scatterlist and its pinned pages. If a later registration step fails, unmap the scatterlist and clear the MR fields before returning.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 1659185fb4d0025835eb2058a141f0746c5cab00 · fixed in 1be3211e6ac77adbb1eac01314d989d243b32c59; From 1659185fb4d0025835eb2058a141f0746c5cab00 · fixed in c42d316163f89cd23de2f3e24558177a8c29bad8; From 1659185fb4d0025835eb2058a141f0746c5cab00 · fixed in 8dca3c81344532a7f05edb3d12f31f3009410a90; From 1659185fb4d0025835eb2058a141f0746c5cab00 · fixed in 49ba5ed0129906e0362c2e4b5e21c89b2a41e115; From 1659185fb4d0025835eb2058a141f0746c5cab00 · fixed in 4468df5bcdef959fd96494e9968f323561a45f4c; From 1659185fb4d0025835eb2058a141f0746c5cab00 · fixed in e2ee0616260080376123997488b5cf8a3870b8d9; From 1659185fb4d0025835eb2058a141f0746c5cab00 · fixed in b36d32f30c3f1e58e3a5ae79d0f52836a316b36e; From 1659185fb4d0025835eb2058a141f0746c5cab00 · fixed in 58eb1b3325edac42dc6df72c80962bd53a3c8ca7

  • Linux Linux

    4.6

  • KernelLinux

    From 4.6.0 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.55; From 6.19.0 · fixed in 7.2.9

References 8

git.kernel.org