CVE-2026-98524
Received
Received - Intake
Use-After-Free in Linux Kernel RDS IB MR Handling
Vulnerability report for CVE-2026-98524, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-18
Last updated on: 2026-10-18
Assigner: kernel.org
Description
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | 1659185fb4d0025835eb2058a141f0746c5cab00 |
| Linux | Linux | 1659185fb4d0025835eb2058a141f0746c5cab00 |
| Linux | Linux | 1659185fb4d0025835eb2058a141f0746c5cab00 |
| Linux | Linux | 1659185fb4d0025835eb2058a141f0746c5cab00 |
| Linux | Linux | 1659185fb4d0025835eb2058a141f0746c5cab00 |
| Linux | Linux | 1659185fb4d0025835eb2058a141f0746c5cab00 |
| Linux | Linux | 1659185fb4d0025835eb2058a141f0746c5cab00 |
| Linux | Linux | 1659185fb4d0025835eb2058a141f0746c5cab00 |
| Linux | Linux | 4.6 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
