Linux Kernel up to 7.1.9 SELinux /sys/fs/selinux/load selinux_policy_cancel null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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4.0$0-$5k1.40

Summaryinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 7.1.9. This issue affects the function selinux_policy_cancel of the file /sys/fs/selinux/load of the component SELinux. The manipulation results in null pointer dereference. This vulnerability was named CVE-2026-80756. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 7.1.9. Affected is the function selinux_policy_cancel of the file /sys/fs/selinux/load of the component SELinux. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: selinux: do not cancel a policy conversion that never started sel_write_load() calls selinux_policy_cancel() when sel_make_policy_nodes() fails, and that helper dereferences the outgoing policy to cancel its sidtab conversion. On the first policy load there is no outgoing policy: security_load_policy() returns early for that case, before it converts anything, and state->policy is still NULL. A first load that fails while building the selinuxfs tree therefore takes a NULL dereference in selinux_policy_cancel(), reached from a write(2) to /sys/fs/selinux/load. Skip the cancel when there is no old policy, mirroring the check security_load_policy() already makes before it converts.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-80756 since 08/26/2026. The exploitability is told to be easy. Local access is required to approach this attack. Additional levels of successful authentication are necessary for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 5.10.266, 5.15.217, 6.1.184, 6.6.153, 6.12.105, 6.18.46 or 7.1.10 eliminates this vulnerability. Applying the patch 2d29983104f06f5b0babcd5a25a0f0408272cd27/a4f182f8715cb0819445f0850cd5436828f4bafc/1059789ae9f99cbbe3a78e361e9c0976beb5958b/1acc317d67a755a45e32419a15d70e403fa43f0e/a42932c6aa33d0aac683cacdf1ec7009b955ba5d/1b4ff94ae7c580c880291519fb0e3e2bd075beef/219c96de5d9b6b4af7e8576ad897b774cc3ee9a7/e5c0235a3c4e9eb047a16cd02323fe4ecf2f570e is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.2
VulDB Meta Temp Score: 4.0

VulDB Base Score: 4.2
VulDB Temp Score: 4.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.266/5.15.217/6.1.184/6.6.153/6.12.105/6.18.46/7.1.10
Patch: 2d29983104f06f5b0babcd5a25a0f0408272cd27/a4f182f8715cb0819445f0850cd5436828f4bafc/1059789ae9f99cbbe3a78e361e9c0976beb5958b/1acc317d67a755a45e32419a15d70e403fa43f0e/a42932c6aa33d0aac683cacdf1ec7009b955ba5d/1b4ff94ae7c580c880291519fb0e3e2bd075beef/219c96de5d9b6b4af7e8576ad897b774cc3ee9a7/e5c0235a3c4e9eb047a16cd02323fe4ecf2f570e

Timelineinfo

08/26/2026 CVE reserved
09/03/2026 +8 days Advisory disclosed
09/03/2026 +0 days VulDB entry created
09/03/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80756 (🔒)
GCVE (CVE): GCVE-0-2026-80756
GCVE (VulDB): GCVE-100-398358

Entryinfo

Created: 09/03/2026 11:01
Changes: 09/03/2026 11:01 (60)
Complete: 🔍
Cache ID: 216::103

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