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CVE-2026-74450 (GCVE-0-2026-74450)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:26 – Updated: 2026-08-23 12:47
VLAI
Title
drm/amd/pm: fix pptable use-after-free
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amd/pm: fix pptable use-after-free amdgpu_dpm_get_pp_table() returns a pointer to a driver-owned power table after dropping adev->pm.mutex. The sysfs path then copies from that pointer. A concurrent pp_table write can replace and free the allocation during the copy, causing a use-after-free. Change the DPM interface to copy into caller-provided storage while the mutex is held. Keep the size-only query for attribute discovery without exposing the driver-owned pointer. (cherry picked from commit f6eed7acfd30099ef7baeb6ba45bb59daad80631)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1684d3ba488529266ce6f97b88076bd185f4790e , < 3fbb3ac75000e3187f500a91a4099b24206866a1 (git)
Affected: 1684d3ba488529266ce6f97b88076bd185f4790e , < 9efc767335234cf7a892e46d45cd453b711421e7 (git)
Affected: 1684d3ba488529266ce6f97b88076bd185f4790e , < 81b5af1fb0f14cace6c3b3130a05e5602a597820 (git)
Affected: 1684d3ba488529266ce6f97b88076bd185f4790e , < 8c685df5c3b261c42505110965b42f9a754eb9b7 (git)
Affected: 1684d3ba488529266ce6f97b88076bd185f4790e , < b628f2c6feb3a115ea72d3120a2bd94afc5163df (git)
Affected: 1684d3ba488529266ce6f97b88076bd185f4790e , < bb493058c35c8676e48269ab6732688ea733d23c (git)
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Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.153 , ≤ 6.6.* (semver)
Unaffected: 6.12.105 , ≤ 6.12.* (semver)
Unaffected: 6.18.46 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/pm/amdgpu_dpm.c",
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            "drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h"
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              "versionType": "semver"
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              "status": "unaffected",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/pm: fix pptable use-after-free\n\namdgpu_dpm_get_pp_table() returns a pointer to a driver-owned power table\nafter dropping adev-\u003epm.mutex. The sysfs path then copies from that pointer.\nA concurrent pp_table write can replace and free the allocation during the\ncopy, causing a use-after-free.\n\nChange the DPM interface to copy into caller-provided storage while the mutex\nis held. Keep the size-only query for attribute discovery without exposing\nthe driver-owned pointer.\n\n(cherry picked from commit f6eed7acfd30099ef7baeb6ba45bb59daad80631)"
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            "baseSeverity": "HIGH",
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              "lang": "en",
              "value": "AV:L - Reached only via local sysfs read/write on /sys/class/drm/cardN/device/pp_table (amdgpu_get_pp_table/amdgpu_set_pp_table); no network, adjacent, or physical-access path exists into amdgpu_dpm_get_pp_table().\nAC:L - A single attacker can drive both sides of the race with concurrent pp_table read and write threads; the write path holds pm.mutex during smu_reset/smu_sys_set_pp_table() while the read copies up to PAGE_SIZE-1 bytes from a pointer obtained after mutex drop.\nPR:L - Triggering the concurrent write/free requires sysfs write access to pp_table; the kernel CNA\u0027s CVE-2025-21780 scored the same attribute PR:L because gaming/handheld udev rules commonly group-write pp_* nodes and the commit describes a concurrent pp_table write.\nUI:N - Exploitation is performed by the attacker\u0027s own concurrent sysfs read/write loops; no action by another user or victim is required.\nS:U - The use-after-free corrupts kernel heap memory during a sysfs memcpy in amdgpu_pm.c; impact stays within the kernel security authority with no VM, IOMMU, or sandbox boundary crossed.\nC:H - Use-after-free on a kmalloc\u0027d pp table during memcpy can return freed/reallocated kernel heap contents up to PAGE_SIZE-1 bytes to userspace and enables arbitrary kernel memory reads via heap grooming.\nI:H - Concurrent pp_table writes control kmalloc size/contents while reads dereference the freed pptable, classic UAF heap corruption that can be weaponized for arbitrary kernel writes and privilege escalation.\nA:H - Reading freed pptable memory during memcpy causes kernel oops/panic and smu_reset() during the concurrent write can wedge discrete AMD GPUs; UAF reliably threatens system/GPU availability."
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    "datePublished": "2026-08-15T12:26:55.127Z",
    "dateReserved": "2026-08-15T05:44:03.899Z",
    "dateUpdated": "2026-08-23T12:47:19.009Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:41:41+00:00",
      "cve": "CVE-2026-74450",
      "id": "CVE-2026-74450",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amd/pm: fix pptable use-after-free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74450.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T00:06:11Z",
      "cve": "CVE-2026-74450",
      "id": "CVE-2026-74450",
      "initial_release_date": "2026-08-15T23:52:49Z",
      "product_status:known_affected": "177",
      "product_status:known_not_affected": "185",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74450",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74450.json",
      "version": "4"
    }
  }
}



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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.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.