Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Fix potential use after free in ib_destroy_cq_user() When accessing a CQ via the netlink path the only synchronization mechanism for the said CQ is rdma_restrack_get(). Currently, rdma_restrack_del() is invoked at the end of ib_destroy_cq_user(), which is too late, since by that point vendor-specific resources associated with the CQ might already be freed. This can leave a short window where the CQ remains accessible through restrack, leading to a potential use-after-free. Fix this by moving the rdma_restrack_begin_del() call to the start of ib_destroy_cq_user(), ensuring that the CQ is removed from restrack before its internal resources are released. This guarantees that no new users hold references to a CQ that is in the process of destruction. In addition, this change preserves the intended inverted order between create and destroy routines: resources are added to restrack at the end of successful creation, and hence shall be removed from the restrack first thing during the destruction flow, which keeps the lifecycle management consistent and predictable.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 08f294a1524bc3211a28091daa6c7513828c7d33 before 42f7a0c7a94003059540cce448acabfa62ad119d; affected 08f294a1524bc3211a28091daa6c7513828c7d33 before 253c2ed71a532c70fa0e64317ceb02bb1a50c84c; affected 08f294a1524bc3211a28091daa6c7513828c7d33 before b85a148731eceffacb6a030950187d785175607f; affected 08f294a1524bc3211a28091daa6c7513828c7d33 before 197c262dbf94c0f7ab7ac54b66f892ce9f343232; affected 08f294a1524bc3211a28091daa6c7513828c7d33 before 8a72a6aad84b3928dbb5e564bff1f56a7ec222ae; affected 08f294a1524bc3211a28091daa6c7513828c7d33 before 3481bec4dfc4aee24ffea5a547ee95b70b67d9d5 |
| Linux / Linux | affected 4.16; unaffected 0 before 4.16; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/42f7a0c7a94003059540cce448acabfa62ad119d
- https://git.kernel.org/stable/c/253c2ed71a532c70fa0e64317ceb02bb1a50c84c
- https://git.kernel.org/stable/c/b85a148731eceffacb6a030950187d785175607f
- https://git.kernel.org/stable/c/197c262dbf94c0f7ab7ac54b66f892ce9f343232
- https://git.kernel.org/stable/c/8a72a6aad84b3928dbb5e564bff1f56a7ec222ae
- https://git.kernel.org/stable/c/3481bec4dfc4aee24ffea5a547ee95b70b67d9d5