CVE-2022-49218
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-49218
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49218.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2022-49218
- Downstream
- Related
- Published
- 2025-02-26T01:55:51Z
- Modified
- 2025-10-15T19:28:23.866331Z
- Severity
-
- 7.1 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
- Summary
- drm/dp: Fix OOB read when handling Post Cursor2 register
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
drm/dp: Fix OOB read when handling Post Cursor2 register
The link_status array was not large enough to read the Adjust Request Post Cursor2 register, so remove the common helper function to avoid an OOB read, found with a -Warray-bounds build:
drivers/gpu/drm/drmdphelper.c: In function 'drmdpgetadjustrequestpostcursor': drivers/gpu/drm/drmdphelper.c:59:27: error: array subscript 10 is outside array bounds of 'const u8[6]' {aka 'const unsigned char[6]'} [-Werror=array-bounds] 59 | return linkstatus[r - DPLANE01STATUS]; | ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/drmdphelper.c:147:51: note: while referencing 'linkstatus' 147 | u8 drmdpgetadjustrequestpostcursor(const u8 linkstatus[DPLINKSTATUS_SIZE], | ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Replace the only user of the helper with an open-coded fetch and decode, similar to drivers/gpu/drm/amd/display/dc/core/dclinkdp.c.
- References
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced79465e0ffeb9e4866939ea562bc55367be91e595Fixedaeaed9a9fe694f8b1462fb81e2d33298c929180b
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced79465e0ffeb9e4866939ea562bc55367be91e595Fixeda2151490cc6c57b368d7974ffd447a8b36ade639