CVE-2026-98777

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

binder: fix leaked fd fixups on TF_UPDATE_TXN supersede

When a TF_UPDATE_TXN transaction supersedes a pending async transaction

in a frozen process, the outdated transaction is freed with kfree()

directly. This skips binder_free_txn_fixups(), leaking all

binder_txn_fd_fixup entries and their fget()'d struct file references.

The leaked file refcounts never reach zero, so the struct file objects

are permanently pinned in memory. They survive process exit and

accumulate across invocations until file-max exhaustion.

Every other transaction cleanup path (binder_free_transaction(),

binder_transaction() error paths, binder_release_work()) correctly

calls binder_free_txn_fixups(). Add the missing call before kfree()

in the t_outdated cleanup block.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References