In the Linux kernel, the following vulnerability has been resolved: tee: shm: fix shm leak in register_shm_helper() register_shm_helper() allocates shm before calling iov_iter_npages(). If iov_iter_npages() returns 0, the function jumps to err_ctx_put and leaks shm. This can be triggered by TEE_IOC_SHM_REGISTER with struct tee_ioctl_shm_register_data where length is 0. Jump to err_free_shm instead.

A flaw was found in the Linux kernel's Trusted Execution Environment (TEE) subsystem. A shared memory (shm) leak occurs in the `register_shm_helper()` function when `TEE_IOC_SHM_REGISTER` is called with a zero-length shared memory registration. This can be triggered by a local attacker, potentially leading to a denial of service due to memory exhaustion.

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 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Not affected kernel Red Hat Enterprise Linux 9 Not affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-53210 https://nvd.nist.gov/vuln/detail/CVE-2026-53210 https://lore.kernel.org/linux-cve-announce/2026062503-CVE-2026-53210-7fd4@gregkh/T