FKIE_CVE-2026-80704

Vulnerability from fkie_nvd - Published: 2026-08-28 08:16 - Updated: 2026-08-28 08:16
Severity
Summary
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)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/02647d98340738f918690ed227fdcf154db1b84a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/114b42507b6a23d9d24e24e4ef165233332c64d4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a94e62b7c7018fcfe0251e53fa96af30f12d923a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f556bc844cc4423e5ad41ae41a4c24f1cf75b978
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a94e62b7c7018fcfe0251e53fa96af30f12d923a",
              "status": "affected",
              "version": "1296423bf23c7a58133970e223b1f47ec6570308",
              "versionType": "git"
            },
            {
              "lessThan": "02647d98340738f918690ed227fdcf154db1b84a",
              "status": "affected",
              "version": "1296423bf23c7a58133970e223b1f47ec6570308",
              "versionType": "git"
            },
            {
              "lessThan": "f556bc844cc4423e5ad41ae41a4c24f1cf75b978",
              "status": "affected",
              "version": "1296423bf23c7a58133970e223b1f47ec6570308",
              "versionType": "git"
            },
            {
              "lessThan": "114b42507b6a23d9d24e24e4ef165233332c64d4",
              "status": "affected",
              "version": "1296423bf23c7a58133970e223b1f47ec6570308",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.17"
            },
            {
              "lessThan": "4.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: use proper context for logging\n\nThe same as the rest of the code, get_ss_info_from_atombios() uses\ncalc_pll_cs-\u003ectx-\u003elogger for logging. But calc_pll_cs-\u003ectx is\ninitialized only later in calc_pll_max_vco_construct(). Therefore, any\noutput using DC_LOG_SYNC() leads to a NULL pointer deference in\nget_ss_info_from_atombios().\n\nAccording to Sashiko, the very same problem exists in\ndce112_get_pix_clk_dividers() and dcn3_get_pix_clk_dividers() too.\n\nTo avoid accessing the NULL context, use clk_src-\u003ebase.ctx-\u003elogger\neverywhere. That context in base is initialized earlier in\ndce110_clk_src_construct() and dce112_clk_src_construct(). Before\nget_ss_info_from_atombios() or Sashiko\u0027s get_pix_clk_dividers functions\nabove are actually called. This is done by redefining DC_LOGGER to\nCTX-\u003elogger.\n\nBefore:\ndce110_clk_src_construct() did:\n -\u003e sets clk_src-\u003ebase.ctx = ctx;\n -\u003e ss_info_from_atombios_create()\n   -\u003e get_ss_info_from_atombios()   \u003c- uses calc_pll_cs-\u003ectx  # BOOM\n -\u003e calc_pll_max_vco_construct()    \u003c- sets calc_pll_cs-\u003ectx\n\nAfter:\ndce110_clk_src_construct() does:\n -\u003e sets clk_src-\u003ebase.ctx = ctx;\n -\u003e ss_info_from_atombios_create()\n   -\u003e get_ss_info_from_atombios()   \u003c- uses clk_src-\u003ebase.ctx\n\n(cherry picked from commit 6f16fcbb0c46a87e3d9685407e906573d60104b0)"
    }
  ],
  "id": "CVE-2026-80704",
  "lastModified": "2026-08-28T08:16:55.953",
  "metrics": {},
  "published": "2026-08-28T08:16:55.953",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/02647d98340738f918690ed227fdcf154db1b84a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/114b42507b6a23d9d24e24e4ef165233332c64d4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a94e62b7c7018fcfe0251e53fa96af30f12d923a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f556bc844cc4423e5ad41ae41a4c24f1cf75b978"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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Detection rules are retrieved from Rulezet.