CVE-2026-49427 - posixshm: largepage shared memory objects not explicitly wired

CVE-2026-49427 - posixshm: largepage shared memory objects not explicitly wired

https://cvefeed.io/rssfeed/latest.atom / Wed, 08/19/2026 - 10:27
CVE ID :CVE-2026-49427
Published : Aug. 19, 2026, 6:17 a.m. | 1 hour, 43 minutes ago
Description :Pages belonging to largepage shared memory objects were not explicitly wired. When sendfile(2) transmitted such an object with the SF_NOCACHE flag, it freed the underlying pages after transmission even though existing mappings still referred to them. An unprivileged local user can abuse the bug to access freed kernel memory. This can be exploited to escalate privileges.
Severity: 0.0 | NA
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