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CVE-2026-74405 (GCVE-0-2026-74405)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:46
VLAI
Title
OPP: Fix race between OPP addition and lookup
Summary
In the Linux kernel, the following vulnerability has been resolved: OPP: Fix race between OPP addition and lookup A race exists between dev_pm_opp_add_dynamic() and dev_pm_opp_find_freq_exact(): CPU0 (add) CPU1 (lookup) ------------------------------- ------------------------------ _opp_add() mutex_lock() list_add(&new_opp->node, head) mutex_unlock() _opp_table_find_key() mutex_lock() dev_pm_opp_get(opp) kref_get() mutex_unlock() kref_init(&new_opp->kref) dev_pm_opp_put() kref_put_mutex() The newly added OPP is inserted into the list before its kref is initialized. A concurrent lookup can find this OPP and increment its reference count while it is still uninitialized, leading to refcount corruption and a potential premature free. Fix this by initializing ->kref and ->opp_table before making the OPP visible via list_add(). This ensures any concurrent lookup observes a fully initialized object. [ Viresh: Updated commit log ]
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: 7034764a1e4a6edbb60914e89aad8384e3fe5d17 , < 46696b0b2123475d7f95909435c09808fc5ffd23 (git)
Affected: 7034764a1e4a6edbb60914e89aad8384e3fe5d17 , < bb75bd7d9ae7672034f73ce67a57e6ac89bb39e5 (git)
Affected: 7034764a1e4a6edbb60914e89aad8384e3fe5d17 , < f5e1cc9a284bff2510981643a5bca4bc4c21b81a (git)
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Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/opp/core.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
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              "version": "4.11"
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              "status": "unaffected",
              "version": "0",
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nOPP: Fix race between OPP addition and lookup\n\nA race exists between dev_pm_opp_add_dynamic() and\ndev_pm_opp_find_freq_exact():\n\n  CPU0 (add)                          CPU1 (lookup)\n  -------------------------------     ------------------------------\n  _opp_add()\n    mutex_lock()\n    list_add(\u0026new_opp-\u003enode, head)\n    mutex_unlock()                    _opp_table_find_key()\n                                        mutex_lock()\n                                        dev_pm_opp_get(opp)\n                                          kref_get()\n                                        mutex_unlock()\n    kref_init(\u0026new_opp-\u003ekref)\n                                      dev_pm_opp_put()\n                                        kref_put_mutex()\n\nThe newly added OPP is inserted into the list before its kref is\ninitialized. A concurrent lookup can find this OPP and increment its\nreference count while it is still uninitialized, leading to refcount\ncorruption and a potential premature free.\n\nFix this by initializing -\u003ekref and -\u003eopp_table before making the OPP\nvisible via list_add(). This ensures any concurrent lookup observes a\nfully initialized object.\n\n[ Viresh: Updated commit log ]"
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is in the kernel OPP DVFS core reached only from local cpufreq, devfreq, thermal, and GPU power-management paths (e.g. scmi-cpufreq, mtk-mfg, MSM Adreno) that call dev_pm_opp_add_dynamic() and dev_pm_opp_find_freq_exact(); there is no network, adjacent-radio, or physical-device input into _opp_add().\nAC:L - The attacker can drive the lookup side with parallel CPU/GPU load or cpufreq scaling while the kernel concurrently inserts OPPs via _opp_add() during multi-CPU SCMI/GPU power-domain attach and boot cpufreq init; both race participants are attacker-influenceable timing on multi-core ARM/Android/embedded systems.\nPR:L - No init-namespace root is required to hammer dev_pm_opp_find_freq_exact() through normal cpufreq, thermal, or GPU DVFS activity from an unprivileged local process; OPP registration runs automatically in kernel driver attach/probe paths without attacker credentials.\nUI:N - Exploitation does not require any victim action beyond the attacker (or kernel) driving DVFS activity; no mount, file open, or other interactive step is needed once the attacker runs concurrent workload or scaling pressure on the target system.\nS:U - Refcount corruption causes premature kfree() of a dev_pm_opp slab object still linked in the OPP table, enabling standard kernel memory corruption and privilege escalation within the same OS boundary rather than a VM, IOMMU, or sandbox escape.\nC:H - Uninitialized kref_get()/kref_init() races corrupt the OPP refcount and can free the structure while still listed; this use-after-free of kmalloc\u0027d dev_pm_opp memory can expose adjacent heap contents and support arbitrary kernel read primitives.\nI:H - Premature free of dev_pm_opp while its list node remains reachable allows heap reuse and controlled writes through subsequent allocations, providing a standard path to corrupt kernel objects and achieve arbitrary code execution.\nA:H - Refcount corruption can trigger _opp_kref_release() to kfree() an OPP still referenced by concurrent lookups, causing kernel oops/panic from use-after-free or list corruption during ongoing DVFS operations."
            }
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        "dateUpdated": "2026-08-17T05:46:47.595Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/46696b0b2123475d7f95909435c09808fc5ffd23"
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      ],
      "title": "OPP: Fix race between OPP addition and lookup",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74405",
    "datePublished": "2026-08-15T05:59:14.719Z",
    "dateReserved": "2026-08-15T05:44:03.892Z",
    "dateUpdated": "2026-08-17T05:46:47.595Z",
    "state": "PUBLISHED"
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      "percentile": "0.0271"
    },
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      "cve": "CVE-2026-74405",
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      "initial_release_date": "2026-08-23T15:00:51.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
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      "title": "OPP: Fix race between OPP addition and lookup",
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      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74405\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:42.530\",\"lastModified\":\"2026-08-17T06:19:35.740\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nOPP: Fix race between OPP addition and lookup\\n\\nA race exists between dev_pm_opp_add_dynamic() and\\ndev_pm_opp_find_freq_exact():\\n\\n  CPU0 (add)                          CPU1 (lookup)\\n  -------------------------------     ------------------------------\\n  _opp_add()\\n    mutex_lock()\\n    list_add(\u0026new_opp-\u003enode, head)\\n    mutex_unlock()                    _opp_table_find_key()\\n                                        mutex_lock()\\n                                        dev_pm_opp_get(opp)\\n                                          kref_get()\\n                                        mutex_unlock()\\n    kref_init(\u0026new_opp-\u003ekref)\\n                                      dev_pm_opp_put()\\n                                        kref_put_mutex()\\n\\nThe newly added OPP is inserted into the list before its kref is\\ninitialized. A concurrent lookup can find this OPP and increment its\\nreference count while it is still uninitialized, leading to refcount\\ncorruption and a potential premature free.\\n\\nFix this by initializing -\u003ekref and -\u003eopp_table before making the OPP\\nvisible via list_add(). This ensures any concurrent lookup observes a\\nfully initialized object.\\n\\n[ Viresh: Updated commit log ]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/opp/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7034764a1e4a6edbb60914e89aad8384e3fe5d17\",\"lessThan\":\"46696b0b2123475d7f95909435c09808fc5ffd23\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7034764a1e4a6edbb60914e89aad8384e3fe5d17\",\"lessThan\":\"bb75bd7d9ae7672034f73ce67a57e6ac89bb39e5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7034764a1e4a6edbb60914e89aad8384e3fe5d17\",\"lessThan\":\"f5e1cc9a284bff2510981643a5bca4bc4c21b81a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/opp/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/46696b0b2123475d7f95909435c09808fc5ffd23\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bb75bd7d9ae7672034f73ce67a57e6ac89bb39e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f5e1cc9a284bff2510981643a5bca4bc4c21b81a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T19:45:54+00:00",
      "cve": "CVE-2026-74405",
      "id": "CVE-2026-74405",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "182",
      "product_status:known_not_affected": "92",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: OPP: Fix race between OPP addition and lookup",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74405.json",
      "version": "3"
    }
  }
}



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