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CVE-2025-40346 (GCVE-0-2025-40346)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:30 – Updated: 2026-05-11 21:47
VLAI
Title
arch_topology: Fix incorrect error check in topology_parse_cpu_capacity()
Summary
In the Linux kernel, the following vulnerability has been resolved: arch_topology: Fix incorrect error check in topology_parse_cpu_capacity() Fix incorrect use of PTR_ERR_OR_ZERO() in topology_parse_cpu_capacity() which causes the code to proceed with NULL clock pointers. The current logic uses !PTR_ERR_OR_ZERO(cpu_clk) which evaluates to true for both valid pointers and NULL, leading to potential NULL pointer dereference in clk_get_rate(). Per include/linux/err.h documentation, PTR_ERR_OR_ZERO(ptr) returns: "The error code within @ptr if it is an error pointer; 0 otherwise." This means PTR_ERR_OR_ZERO() returns 0 for both valid pointers AND NULL pointers. Therefore !PTR_ERR_OR_ZERO(cpu_clk) evaluates to true (proceed) when cpu_clk is either valid or NULL, causing clk_get_rate(NULL) to be called when of_clk_get() returns NULL. Replace with !IS_ERR_OR_NULL(cpu_clk) which only proceeds for valid pointers, preventing potential NULL pointer dereference in clk_get_rate().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < 64da320252e43456cc9ec3055ff567f168467b37 (git)
Affected: b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < 02fbea0864fd4a863671f5d418129258d7159f68 (git)
Affected: b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < a77f8434954cb1e9c42c3854e40855fdcf5ab235 (git)
Affected: b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < 3373f263bb647fcc3b5237cfaef757633b9ee25e (git)
Affected: b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < 45379303124487db3a81219af7565d41f498167f (git)
Affected: b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < 3a01b2614e84361aa222f67bc628593987e5cdb2 (git)
Affected: b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < 2eead19334516c8e9927c11b448fbe512b1f18a1 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.196 , ≤ 5.15.* (semver)
Unaffected: 6.1.158 , ≤ 6.1.* (semver)
Unaffected: 6.6.115 , ≤ 6.6.* (semver)
Unaffected: 6.12.56 , ≤ 6.12.* (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narch_topology: Fix incorrect error check in topology_parse_cpu_capacity()\n\nFix incorrect use of PTR_ERR_OR_ZERO() in topology_parse_cpu_capacity()\nwhich causes the code to proceed with NULL clock pointers. The current\nlogic uses !PTR_ERR_OR_ZERO(cpu_clk) which evaluates to true for both\nvalid pointers and NULL, leading to potential NULL pointer dereference\nin clk_get_rate().\n\nPer include/linux/err.h documentation, PTR_ERR_OR_ZERO(ptr) returns:\n\"The error code within @ptr if it is an error pointer; 0 otherwise.\"\n\nThis means PTR_ERR_OR_ZERO() returns 0 for both valid pointers AND NULL\npointers. Therefore !PTR_ERR_OR_ZERO(cpu_clk) evaluates to true (proceed)\nwhen cpu_clk is either valid or NULL, causing clk_get_rate(NULL) to be\ncalled when of_clk_get() returns NULL.\n\nReplace with !IS_ERR_OR_NULL(cpu_clk) which only proceeds for valid\npointers, preventing potential NULL pointer dereference in clk_get_rate()."
          }
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        "id": "CVE-2025-40346",
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        "metrics": {},
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        "vulnStatus": "Deferred"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:26:03+00:00",
      "cve": "CVE-2025-40346",
      "id": "CVE-2025-40346",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: arch_topology: Fix incorrect error check in topology_parse_cpu_capacity()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40346.json",
      "version": "3"
    }
  }
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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