CVE-2026-64220: linux Use of Uninitialized Resource
Vulnerability summary
CVE-2026-64220 is a medium (CVSS 5.5) Use of Uninitialized Resource vulnerability in linux. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.8% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 36 · Related 36Timeline
- 24-07-2026PublishedVulnerability first disclosed.
Description
In the Linux kernel, the following vulnerability has been resolved: device property: set fwnode->secondary to NULL in fwnode_init() If a firmware node is allocated on the stack (for instance: temporary software node whose life-time we control) or on the heap - but using a non-zeroing allocation function - and initialized using fwnode_init(), its secondary pointer will contain uninitalized memory which likely will be neither NULL nor IS_ERR() and so may end up being dereferenced (for example: in dev_to_swnode()). Set fwnode->secondary to NULL on initialization.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.12%
Chance of exploitation in the next 30 days
Percentile
2%
Versus all other CVEs
30-day change
0.00 pp
From 0.12% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu155 products
- linux< 5.15.0-186.196 | < 6.8.0-139.139 | < 7.0.0-28.28
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.15.0-1112.119 | < 6.8.0-1064.67 | < 7.0.0-1009.9
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 01bb86b380a306bd937c96da36f66429f3362137, < f0e211d6539fae800217c10797993b7592d6ab01 | ≥ 01bb86b380a306bd937c96da36f66429f3362137, < 3f1024deeab3b5443c29b3de4fe475e87309b8fa | ≥ 01bb86b380a306bd937c96da36f66429f3362137, < 371f53925a6714d0aa35f1aefdffc3e8cd62f480 | ≥ 01bb86b380a306bd937c96da36f66429f3362137, < 34bf74b1fd2e4a44e27821a329204caf09df2976 | ≥ 01bb86b380a306bd937c96da36f66429f3362137, < 508fd8ab158abd04b7f7d0f707cd6d6c405df4ea | ≥ 01bb86b380a306bd937c96da36f66429f3362137, < f59e686c778cb41b8f7aa8fab2afd6a01afb3d47 | ≥ 01bb86b380a306bd937c96da36f66429f3362137, < 215c90ee656114f5e8c32408228d97082f8e0eef | 5.11
- linux_kernel≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.142 | ≥ 6.7, < 6.12.92 | ≥ 6.13, < 6.18.34 | ≥ 6.19, < 7.0.11 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4
Debian1 product
- linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1
3 vendors · 158 products
