Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1659185fb4d0025835eb2058a141f0746c5cab00 before 1be3211e6ac77adbb1eac01314d989d243b32c59; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before c42d316163f89cd23de2f3e24558177a8c29bad8; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before 8dca3c81344532a7f05edb3d12f31f3009410a90; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before 49ba5ed0129906e0362c2e4b5e21c89b2a41e115; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before 4468df5bcdef959fd96494e9968f323561a45f4c; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before e2ee0616260080376123997488b5cf8a3870b8d9; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before b36d32f30c3f1e58e3a5ae79d0f52836a316b36e; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before 58eb1b3325edac42dc6df72c80962bd53a3c8ca7 |
| Linux / Linux | affected 4.6; unaffected 0 before 4.6; unaffected 5.10.271 through 5.10.*; unaffected 5.15.222 through 5.15.*; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.112 through 6.12.*; unaffected 6.18.55 through 6.18.*; unaffected 7.2.9 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/1be3211e6ac77adbb1eac01314d989d243b32c59
- https://git.kernel.org/stable/c/c42d316163f89cd23de2f3e24558177a8c29bad8
- https://git.kernel.org/stable/c/8dca3c81344532a7f05edb3d12f31f3009410a90
- https://git.kernel.org/stable/c/49ba5ed0129906e0362c2e4b5e21c89b2a41e115
- https://git.kernel.org/stable/c/4468df5bcdef959fd96494e9968f323561a45f4c
- https://git.kernel.org/stable/c/e2ee0616260080376123997488b5cf8a3870b8d9
- https://git.kernel.org/stable/c/b36d32f30c3f1e58e3a5ae79d0f52836a316b36e
- https://git.kernel.org/stable/c/58eb1b3325edac42dc6df72c80962bd53a3c8ca7