VulnerabilityPublished 17 Sep 2026Updated 21 Oct 2026

CVE-2026-90250: Linux kernel · bpf, cgroup: Fix storage null-ptr-deref after replacing prog

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in a033c950f6731be88a7da98604ed78f302f15b80 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:30 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in a033c950f6731be88a7da98604ed78f302f15b80, 16c8321ee40c420f8e02e09515a5126682ddf4ea, 12feca126831556dc7fabe5a3ba28fbd328768b6 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < a033c950f6731be88a7da98604ed78f302f15b80	Fixed in a033c950f6731be88a7da98604ed78f302f15b80
LinuxLinux	Affected ≥ 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < 16c8321ee40c420f8e02e09515a5126682ddf4ea	Fixed in 16c8321ee40c420f8e02e09515a5126682ddf4ea
LinuxLinux	Affected ≥ 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < 12feca126831556dc7fabe5a3ba28fbd328768b6	Fixed in 12feca126831556dc7fabe5a3ba28fbd328768b6
LinuxLinux	Affected ≥ 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < 3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94	Fixed in 3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94
LinuxLinux	Affected ≥ 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < 1ab3da12061d7ccb099f7e925fa2d865967a316a	Fixed in 1ab3da12061d7ccb099f7e925fa2d865967a316a
LinuxLinux	Affected =5.7	Fixed in–

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.

References

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