Description (CNA)
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supersede When a TF_UPDATE_TXN transaction supersedes a pending async transaction in a frozen process, the outdated transaction is freed with kfree() directly.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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 9864bb4801331daa48514face9d0f4861e4d485b before a7329ea53d04f0c6135d02905810cd6f42acdf45; affected 9864bb4801331daa48514face9d0f4861e4d485b before 7fd609fb0e9dcbc4d7a1e4da1af5368c0555ff55; affected 9864bb4801331daa48514face9d0f4861e4d485b before 1299cb3fb061598496086fc87ff291057831148e; affected 9864bb4801331daa48514face9d0f4861e4d485b before 6673f4f21e2fddfed0abe1eb9045cc958e6db130; affected 9864bb4801331daa48514face9d0f4861e4d485b before c4c02084d6687d5cd5edccaf52cc45e5160f1184 |
| Linux / Linux | affected 6.0; unaffected 0 before 6.0; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.18.56 through 6.18.*; unaffected 7.2.10 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/a7329ea53d04f0c6135d02905810cd6f42acdf45
- https://git.kernel.org/stable/c/7fd609fb0e9dcbc4d7a1e4da1af5368c0555ff55
- https://git.kernel.org/stable/c/1299cb3fb061598496086fc87ff291057831148e
- https://git.kernel.org/stable/c/6673f4f21e2fddfed0abe1eb9045cc958e6db130
- https://git.kernel.org/stable/c/c4c02084d6687d5cd5edccaf52cc45e5160f1184