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A vulnerability in the Linux kernel memfd sealing logic allowed a writable memfd mapping to persist when SEAL_EXEC was added and implicitly applied SEAL_WRITE. The flaw was caused by incorrect ordering in the seal application path: the kernel performed the check intended to deny writable mappings before adding the implied SEAL_WRITE seal. As a result, an attacker could use SEAL_EXEC to obtain a memfd that appeared to be write-sealed while writable mappings still existed, violating the security guarantees of SEAL_WRITE and weakening the intended W^X enforcement for memfd objects. The issue was fixed by applying implied seals before invoking the writable-mapping denial check.
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A Linux kernel memfd sealing flaw where SEAL_EXEC implicitly applies SEAL_WRITE after the writable-mapping check, allowing a memfd to appear write-sealed while still remaining writable, undermining W^X and SEAL_WRITE guarantees.
A specific vulnerability affecting Red Hat Enterprise Linux 10.2 kernel-related packages; the content does not provide technical details beyond listing it in the advisory.
A specific vulnerability affecting Red Hat Enterprise Linux 9 kernel-related packages, referenced in RHSA-2026:57252.
Linux kernel memfd flaw involving writable mappings when implying SEAL_WRITE.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.