Linux Kernel up to 6.18.13/6.19.3 bpf BPF_PROG_DETACH permission

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.13/6.19.3. It has been rated as critical. Affected by this vulnerability is the function BPF_PROG_DETACH of the component bpf. Performing a manipulation results in permission. This vulnerability is known as CVE-2026-45932. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.13/6.19.3. It has been classified as critical. This affects the function BPF_PROG_DETACH of the component bpf. The manipulation with an unknown input leads to a permission vulnerability. CWE is classifying the issue as CWE-275. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix tcx/netkit detach permissions when prog fd isn't given This commit fixes a security issue where BPF_PROG_DETACH on tcx or netkit devices could be executed by any user when no program fd was provided, bypassing permission checks. The fix adds a capability check for CAP_NET_ADMIN or CAP_SYS_ADMIN in this case.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-45932 since 05/13/2026. The exploitability is told to be easy. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/25/2026). The attack technique deployed by this issue is T1222 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 321697 (SUSE SLES16 Security Update : kernel (SUSE-SU-2026:22099-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.18.14 or 6.19.4 eliminates this vulnerability. Applying the patch 4e0772cded109c238411f2fac36ac39302758b81/3f04cc1e5374da4c5e791ae010a06cfea7bacbe6/ae23bc81ddf7c17b663c4ed1b21e35527b0a7131 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (321697). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.19.0
• 6.19.1
• 6.19.2
• 6.19.3

License

• open-source

Website

• Vendor: https://www.kernel.org/

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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