Uninitialized stack-data evaluation via register overmarking
Published Jun 25, 2026 · Updated Jun 25, 2026
Use of uninitialized memory in Linux Kernel allows local users to make nftables evaluate stale kernel stack data through crafted rules. nft_exthdr_init() gives user-controlled priv->len to nft_parse_register_store(), which marks more register bytes initialized than F_PRESENT evaluation writes. Requests longer than four bytes leave later nft_regs storage unwritten; exploitation requires local nftables rule creation, and public sources do not establish whether the stale data can be exfiltrated or only affects availability.
Summary
What happened
Use of uninitialized memory in Linux Kernel allows local users to make nftables evaluate stale kernel stack data through crafted rules. nft_exthdr_init() gives user-controlled priv->len to nft_parse_register_store(), which marks more register bytes initialized than F_PRESENT evaluation writes. Requests longer than four bytes leave later nft_regs storage unwritten; exploitation requires local nftables rule creation, and public sources do not establish whether the stale data can be exfiltrated or only affects availability.
The record
- CVE
- CVE-2026-53218
- Published
- Jun 25, 2026
- Updated
- Jun 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Jun 25, 2026CVE publishedPublication date reported by the CVE source.
- Jun 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.11
- Affected versionversion=c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 <19748967d59c31d24d21d40b728570788310b237
- Affected versionversion=c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 <46fc15a044e9938e7ea77786fb37edd2cd74f031
- Affected versionversion=c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 <67b27434c43b68a97becda98c9f0c8cf6cba2134
- Affected versionversion=c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 <772cecf198da732faebb5dcfc46d66a505be8495
- Affected versionversion=c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 <78069a6d8bc86c9e036eb82c2af4a19cc1871a53
- Affected versionversion=c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 <8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6
- Affected versionversion=c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 <cd513e43b4b2bd1de39e2367bc4261c699a8652f
- Affected versionversion=c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 <f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
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Technologies
Your stack
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Your stack
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