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CVE-2026-63952 is a protection-mechanism flaw in the Linux kernel's memfd sealing implementation. Adding SEAL_EXEC implicitly adds SEAL_WRITE to enforce write-versus-execute restrictions, but the vulnerable implementation adds the implied seal after the writable-mapping check. Existing writable mappings can therefore remain present even though the memfd reports SEAL_WRITE. An attacker can pass a seemingly write-sealed memory-backed file whose contents remain arbitrarily modifiable. The fix applies the implied seals before calling mapping_deny_writable().
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A Linux kernel memfd vulnerability involving writable mappings when SEAL_WRITE is implied, addressed by denying those mappings.
A vulnerability covered by the Miracle Linux kernel package update. Individual technical details and exploit availability are not specified.
A Linux kernel memfd sealing flaw allows SEAL_EXEC to imply SEAL_WRITE without first rejecting existing writable mappings. An attacker can consequently pass a memfd that appears write-sealed but remains arbitrarily modifiable, violating its integrity guarantees. The fix applies implied seals before mapping_deny_writable(). The plugin reports a CVSS v3 base score of 8.4, with local access and low privileges required.
A Linux kernel memfd sealing flaw allows an attacker to bypass the guarantees of SEAL_WRITE by adding SEAL_EXEC while writable mappings exist. The fix applies implied seals before mapping_deny_writable() checks the mappings. The reference reports a CVSS v3 base score of 8.4, requiring local access and low privileges.
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