# CVE-2022-49963: linux: In the Linux kernel, the following vulnerability has been resolved:  drm/i915/ttm: fix CCS handling  Crucible + recen...

CVE-2022-49963 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49963, released June 18, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49963
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 18, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  drm/i915/ttm: fix CCS handling  Crucible + recent Mesa seems to sometimes hit:  GEM_BUG_ON(num_ccs_blks > NUM_CCS_BLKS_PER_XFER)  And it looks like we can also trigger this with gem_lmem_swapping, if we modify the test to use slightly larger object sizes.  Looking closer it looks like we have the following issues in migrate_copy():    - We are using plain integer in various places, which we can easily     overflow with a large object.    - We pass the entire object size (when the src is lmem) into     emit_pte() and then try to copy it, which doesn't work, since we     only have a few fixed sized windows in which to map the pages and     perform the copy. With an object > 8M we therefore aren't properly     copying the pages. And then with an object > 64M we trigger the     GEM_BUG_ON(num_ccs_blks > NUM_CCS_BLKS_PER_XFER).  So it looks like our copy handling for any object > 8M (which is our CHUNK_SZ) is currently broken on DG2.  Testcase: igt@gem_lmem_swapping (cherry picked from commit 8676145eb2f53a9940ff70910caf0125bd8a4bc2)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.2-1 | [DEBIAN-CVE-2022-49963](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49963.md) | Jun 18, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.2-1 | [DEBIAN-CVE-2022-49963](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49963.md) | Jun 18, 2025 |
| Linux | linux Debian 14 | 6.0.2-1 | [DEBIAN-CVE-2022-49963](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49963.md) | Jun 18, 2025 |

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