CVE-2026-49422

The record

The RACK setsockopt(2) handler drops the connection lock in order to copy option data from userspace, then reacquires the lock. After reacquiring, it verifies that the TCP stack had not been switched away, but did not reload its pointer to the stack's per-connection control block. If userspace switches stacks twice during this window, the check will succeed but the saved pointer will refer to freed memory. The bug may be exploitable by an unprivileged local user to escalate privileges.

Affected packages

Related vulnerabilities

• CVE-2026-109618 PHP uses longjmp() for out-of-memory (OOM) errors to exit the current context and abort… CWE-416
• CVE-2026-109619 PHP has various global state that temporarily points into request memory. CWE-416
• CVE-2026-112402 Pillow is a Python imaging library. CWE-416
• CVE-2026-112396 Pillow is a Python imaging library. CWE-416
• CVE-2025-55654 A use-after-free in the gf_filter_pid_get_packet function (filter_core/filter_pid.c) of… CWE-416
• CVE-2026-17591 A flaw was found in libarchive. CWE-416
• CVE-2026-92392 During an upload, curl mishandles HTTP/2 `RST_STREAM` received from the server (with… CWE-416
• CVE-2026-109268 ImageMagick before 6.9.13-57 and 7.x before 7.1.2-32 contains a use after free… CWE-416