Description
In the Linux kernel, the following vulnerability has been resolved:

tracing: Do not call map->ops->elt_free() if elt_alloc() fails

In paths where tracing_map_elt_alloc() failed to allocate objects,
the map->ops->elt_alloc() call was never successful. In this case,
map->ops->elt_free() should not be called.
Published: 2026-07-19
Score: 5.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

In the Linux kernel tracing subsystem, a flaw occurs when the allocation function for a map element fails. The code still attempts to free an element that was not successfully allocated, which results in an invalid free operation that can crash the kernel. The weakness is catalogued as CWE‑1341. The adverse impact is a kernel panic or denial of service, potentially affecting system availability. Based on the description, it is inferred that the crash occurs only if the faulty free is executed after a failed allocation.

Affected Systems

The vulnerability affects the tracing component of the Linux kernel. The cpe entries indicate all Linux kernel releases, and particular 7.1 release candidate branches were referenced in the advisory. Any running kernel that includes the vulnerable tracing code path, whether current or legacy, may be subject to the issue until the patch is applied.

Risk and Exploitability

The CVSS score of 5.5 reflects moderate severity. The EPSS score is less than 1%, suggesting a low probability of exploitation. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector is local, requiring the attacker to trigger a tracing path that fails allocation and then invoke the misfree; remote exploitation would require elevated privileges or additional conditions. Because the flaw leads to an invalid free, an attacker who can execute code in kernel context may be able to crash the system or use repeated crashes to force undesired behavior.

Generated by OpenCVE AI on August 13, 2026 at 18:24 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the latest Linux kernel update that contains the fix for the tracing mis‑free.
  • If an update is not immediately possible, disable or reduce usage of the offending tracing subsystem through kernel configuration or sysctl settings to prevent the failing allocation path.
  • Regularly monitor system logs for kernel OOPS or memory corruption messages related to tracing and apply the patch as soon as it becomes available.

Generated by OpenCVE AI on August 13, 2026 at 18:24 UTC.

Tracking

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Advisories
Source ID Title
Ubuntu USN Ubuntu USN USN-8575-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-8576-1 Linux kernel (NVIDIA Tegra) vulnerabilities
Ubuntu USN Ubuntu USN USN-8593-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-8575-2 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-8576-2 Linux kernel (NVIDIA Tegra) vulnerabilities
Ubuntu USN Ubuntu USN USN-8575-3 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-8603-1 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-8610-1 Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN Ubuntu USN USN-8618-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-8620-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-8620-2 Linux kernel (Azure FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-8620-3 Linux kernel (Intel IoTG) vulnerabilities
Ubuntu USN Ubuntu USN USN-8620-4 Linux kernel (Intel IoTG) vulnerabilities
Ubuntu USN Ubuntu USN USN-8663-1 Linux kernel (NVIDIA) vulnerabilities
Ubuntu USN Ubuntu USN USN-8664-1 Linux kernel (NVIDIA BaseOS) vulnerabilities
Ubuntu USN Ubuntu USN USN-8668-1 Linux kernel (GCP) vulnerabilities
History

Thu, 13 Aug 2026 15:45:00 +0000

Type Values Removed Values Added
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*

Mon, 20 Jul 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1341
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate


Sun, 19 Jul 2026 16:15:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: tracing: Do not call map->ops->elt_free() if elt_alloc() fails In paths where tracing_map_elt_alloc() failed to allocate objects, the map->ops->elt_alloc() call was never successful. In this case, map->ops->elt_free() should not be called.
Title tracing: Do not call map->ops->elt_free() if elt_alloc() fails
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Subscriptions

Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-07-19T15:40:58.251Z

Reserved: 2026-07-19T07:54:57.039Z

Link: CVE-2026-64173

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2026-07-19T16:17:59.493

Modified: 2026-08-13T15:32:25.357

Link: CVE-2026-64173

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-07-19T00:00:00Z

Links: CVE-2026-64173 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T18:30:16Z

Weaknesses