# CVE-2025-38636: rv: Use strings in da monitors tracepoints

CVE-2025-38636 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-38636, released August 22, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-38636
- Priority: High
- CVSS: 7.1 (Moderate)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 22, 2025
- Weakness: Out-of-bounds Read
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-38636

## Description

In the Linux kernel, the following vulnerability has been resolved:  rv: Use strings in da monitors tracepoints  Using DA monitors tracepoints with KASAN enabled triggers the following warning:   BUG: KASAN: global-out-of-bounds in do_trace_event_raw_event_event_da_monitor+0xd6/0x1a0  Read of size 32 at addr ffffffffaada8980 by task ...  Call Trace:   <TASK>  [...]   do_trace_event_raw_event_event_da_monitor+0xd6/0x1a0   ? __pfx_do_trace_event_raw_event_event_da_monitor+0x10/0x10   ? trace_event_sncid+0x83/0x200   trace_event_sncid+0x163/0x200  [...]  The buggy address belongs to the variable:   automaton_snep+0x4e0/0x5e0  This is caused by the tracepoints reading 32 bytes __array instead of __string from the automata definition. Such strings are literals and reading 32 bytes ends up in out of bound memory accesses (e.g. the next automaton's data in this case). The error is harmless as, while printing the string, we stop at the null terminator, but it should still be fixed.  Use the __string facilities while defining the tracepoints to avoid reading out of bound memory.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2025-38636](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38636.md) | Aug 22, 2025 |
| Linux | linux Debian 14 | 6.16.3-1 | [DEBIAN-CVE-2025-38636](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38636.md) | Aug 22, 2025 |

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