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CVE-2026-90250

UnknownEPSS 0.21%

Last modified

CVE-2026-90250 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: bpf, cgroup: Fix storage null-ptr-deref after replacing prog Syzkaller reported a storage null-ptr-deref issue after replacing prog. This occurs in the following scenario: 1. prog A, an empty prog, is attached to a cgrp. 2. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: bpf, cgroup: Fix storage null-ptr-deref after replacing prog Syzkaller reported a storage null-ptr-deref issue after replacing prog. This occurs in the following scenario: 1. prog A, an empty prog, is attached to a cgrp. 2. prog B uses BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE and calls the bpf_get_local_storage helper. 3. link_update is called to replace prog A with prog B. The reason is that __cgroup_bpf_replace fails to alloc and assign the required cgrp storage for the incoming replacement prog. Consequently, the new prog inherits an uninit storage, leading to null-ptr-deref panic when kick the new prog. Fix this by rejecting a link update if new_prog's cgroup storage is incompatible with link->prog.

Metrics

EPSS Probability
0.21%

11.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < 85785e7e2ebddcaa5c3b31bd3bcd83ae648985d4; >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < 16c8321ee40c420f8e02e09515a5126682ddf4ea; >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < a033c950f6731be88a7da98604ed78f302f15b80; >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < 1ab3da12061d7ccb099f7e925fa2d865967a316a; >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < 12feca126831556dc7fabe5a3ba28fbd328768b6; >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < 3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94
LinuxLinux5.7

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90250?
In the Linux kernel, the following vulnerability has been resolved: bpf, cgroup: Fix storage null-ptr-deref after replacing prog Syzkaller reported a storage null-ptr-deref issue after replacing prog. This occurs in the following scenario: 1. prog A, an empty prog, is attached to a cgrp. 2. prog B uses BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE and calls the bpf_get_local_storage helper. 3. link_update is called to replace prog A with prog B. The reason is that __cgroup_bpf_replace fails to alloc and assign the required cgrp storage for the incoming replacement prog. Consequently, the new prog inherits an uninit storage, leading to null-ptr-deref panic when kick the new prog. Fix this by rejecting a link update if new_prog's cgroup storage is incompatible with link->prog.
How severe is CVE-2026-90250?
Severity scoring for CVE-2026-90250 is pending analysis. The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-90250?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST