# CVE-2023-53991: linux: In the Linux kernel, the following vulnerability has been resolved:  drm/msm/dpu: Disallow unallocated resources to b...

CVE-2023-53991 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-53991, released December 24, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-53991
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 24, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  drm/msm/dpu: Disallow unallocated resources to be returned  In the event that the topology requests resources that have not been created by the system (because they are typically not represented in dpu_mdss_cfg ^1), the resource(s) in global_state (in this case DSC blocks, until their allocation/assignment is being sanity-checked in "drm/msm/dpu: Reject topologies for which no DSC blocks are available") remain NULL but will still be returned out of dpu_rm_get_assigned_resources, where the caller expects to get an array containing num_blks valid pointers (but instead gets these NULLs).  To prevent this from happening, where null-pointer dereferences typically result in a hard-to-debug platform lockup, num_blks shouldn't increase past NULL blocks and will print an error and break instead. After all, max_blks represents the static size of the maximum number of blocks whereas the actual amount varies per platform.  ^1: which can happen after a git rebase ended up moving additions to _dpu_cfg to a different struct which has the same patch context.  Patchwork: https://patchwork.freedesktop.org/patch/517636/

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.20-1 | [DEBIAN-CVE-2023-53991](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53991.md) | Dec 24, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.20-1 | [DEBIAN-CVE-2023-53991](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53991.md) | Dec 24, 2025 |
| Linux | linux Debian 14 | 6.1.20-1 | [DEBIAN-CVE-2023-53991](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53991.md) | Dec 24, 2025 |

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