Bug 2019643 (CVE-2021-3923) - CVE-2021-3923 kernel: stack information leak in infiniband RDMA
Summary: CVE-2021-3923 kernel: stack information leak in infiniband RDMA
Keywords:
Status: NEW
Alias: CVE-2021-3923
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Nobody
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Depends On: 2006441 2025832 2025833 2025834 2025835 2025836 2036597 2181601
Blocks: 2019635 2019644
TreeView+ depends on / blocked
 
Reported: 2021-11-03 02:20 UTC by Michael Kaplan
Modified: 2023-08-29 16:17 UTC (History)
50 users (show)

Fixed In Version: kernel 5.16
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel's implementation of RDMA over infiniband. An attacker with a privileged local account can leak kernel stack information when issuing commands to the /dev/infiniband/rdma_cm device node. While this access is unlikely to leak sensitive user information, it can be further used to defeat existing kernel protection mechanisms.
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Description Michael Kaplan 2021-11-03 02:20:15 UTC 
A flaw was found in the linux kernels implementation of RDMA over infiniband.  An attacker with a priviledged local account can leak kernel stack information when issuing commands to the /dev/infiniband/rdma_cm device node.

While this access is unlikely to leak sensitive user information, it can be further used to defeat existing kernel protection mechanisms.
Comment 13 Pedro Sampaio 2023-03-24 17:32:39 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2181601]
Comment 14 Justin M. Forbes 2023-03-24 20:49:12 UTC 
This was fixed for Fedora with the 5.15.14 stable kernel updates.
Comment 15 Salvatore Bonaccorso 2023-03-25 07:27:00 UTC 
Is this related to upstream commit https://git.kernel.org/linus/e1e354771812b12f0b4c433bbaf916f87cd0f6c7
Comment 16 Wade Mealing 2023-03-28 06:06:23 UTC 
Sorry Salvatore, i dont check needinfos so frequently in bugzilla these days.

From my notes it looks as though it was fixed here:

https://lore.kernel.org/all/20220204100036.GA12348@kili/
Comment 29 Mauro Matteo Cascella 2023-08-28 15:08:28 UTC 
This issue was fixed upstream in kernel version 5.16. The kernel packages as shipped in Red Hat Enterprise Linux 8 were previously updated to a version that contains the fix via the following errata:

kernel in Red Hat Enterprise Linux 8
https://access.redhat.com/errata/RHSA-2022:1988

kernel-rt in Red Hat Enterprise Linux 8
https://access.redhat.com/errata/RHSA-2022:1975
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