CVE-2026-80704
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: use proper context for logging
The same as the rest of the code, get_ss_info_from_atombios() uses
calc_pll_cs->ctx->logger for logging. But calc_pll_cs->ctx is
initialized only later in calc_pll_max_vco_construct(). Therefore, any
output using DC_LOG_SYNC() leads to a NULL pointer deference in
get_ss_info_from_atombios().
According to Sashiko, the very same problem exists in
dce112_get_pix_clk_dividers() and dcn3_get_pix_clk_dividers() too.
To avoid accessing the NULL context, use clk_src->base.ctx->logger
everywhere. That context in base is initialized earlier in
dce110_clk_src_construct() and dce112_clk_src_construct(). Before
get_ss_info_from_atombios() or Sashiko's get_pix_clk_dividers functions
above are actually called. This is done by redefining DC_LOGGER to
CTX->logger.
Before:
dce110_clk_src_construct() did:
-> sets clk_src->base.ctx = ctx;
-> ss_info_from_atombios_create()
-> get_ss_info_from_atombios() <- uses calc_pll_cs->ctx # BOOM
-> calc_pll_max_vco_construct() <- sets calc_pll_cs->ctx
After:
dce110_clk_src_construct() does:
-> sets clk_src->base.ctx = ctx;
-> ss_info_from_atombios_create()
-> get_ss_info_from_atombios() <- uses clk_src->base.ctx
(cherry picked from commit 6f16fcbb0c46a87e3d9685407e906573d60104b0)
CSIRTS triage
- What
- Improper logging context in AMD display driver may expose internal state or kernel memory during debug operations.
- Who is affected
- Systems running AMD display driver with debug or enhanced logging enabled.
- Urgency
- Medium severity (CVSS 5.5); information disclosure only and requires debug mode.
- Action
- Apply kernel patch for drm/amd/display logging context fix.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all EPSS-scored CVEs.
Advisory coverage (2)
- unknownCVE-2026-80704: In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: use prope…nvd · 2026-08-28
- mediumCVE-2026-80704: drm/amd/display: use proper context for loggingmsrc · 2026-08-11
External references
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