In the Linux kernel, the following vulnerability has been resolved: mailbox: mailbox-test: don't free the reused channel The RX channel can be aliased to the TX channel if it has a different MMIO. This special case needs to be handled when freeing the channels otherwise a double-free occurs.

A flaw was found in the Linux kernel's mailbox subsystem. This vulnerability occurs when the receive (RX) channel is aliased to the transmit (TX) channel with a different Memory-Mapped I/O (MMIO) and is not properly handled during the freeing of channels. This can lead to a double-free condition, which may result in memory corruption and potentially a denial of service.

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Fix deferred kernel Red Hat Enterprise Linux 8 Fix deferred kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-53294 https://nvd.nist.gov/vuln/detail/CVE-2026-53294 https://lore.kernel.org/linux-cve-announce/2026062617-CVE-2026-53294-0b30@gregkh/T