CVE-2026-89543
Description
In the Linux kernel, the following vulnerability has been resolved: sunrpc: fix use-after-free in __rpc_clnt_handle_event and __rpc_clnt_remove_pipedir Normal client creation goes through rpc_setup_pipedir(), which records clnt->pipefs_sb, but the mount-event path in __rpc_clnt_handle_event() calls rpc_setup_pipedir_sb() directly and never refreshes that field. The umount path also removes the directory without clearing clnt->pipefs_sb. After a late pipefs mount or any remount, rpc_clnt_remove_pipedir() compares the current superblock against a stale pipefs_sb pointer and skips cleanup, leaving pipefs dentries whose inode private data still points at a freed rpc_clnt, leading to a potential use-after-free during subsequent rpc_info_open() or rpc_show_info() calls. Fix this by properly updating clnt->pipefs_sb upon mount events and clearing it during unmount or failure paths.
How to fix
- Linux Linux1a713814e0580f946196bca5e340b37991c6e8bf, f99fedfd1dbffe8d20b421c9a7d4655a135d4fcd, 59527bbfb1eabdb28e95e7c725886cc2c2899cb3, e769fcde3cc73e847b1eb3acd40c04a291cb0c0c, cdf7a233cb94774b0e7df42d9157077983f5022c, 932a8cf6abb2b2f8677b79153a823108d8861fe2, 6.1.191, 6.6.160, 4.20, 5.5, 5.11, 5.16, 6.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 7749fd2dbef72a52b5c9ffdbf877691950ed4680 ≤ v < 1a713814e0580f946196bca5e340b37991c6e8bf, cc2e7ebbeb1d0601f7f3c8d93b78fcc03a95e44a ≤ v < f99fedfd1dbffe8d20b421c9a7d4655a135d4fcd, bfca5fb4e97c46503ddfc582335917b0cc228264 ≤ v < 59527bbfb1eabdb28e95e7c725886cc2c2899cb3, bfca5fb4e97c46503ddfc582335917b0cc228264 ≤ v < e769fcde3cc73e847b1eb3acd40c04a291cb0c0c, bfca5fb4e97c46503ddfc582335917b0cc228264 ≤ v < cdf7a233cb94774b0e7df42d9157077983f5022c, bfca5fb4e97c46503ddfc582335917b0cc228264 ≤ v < 932a8cf6abb2b2f8677b79153a823108d8861fe2, 17866066b8ac1cc38fb449670bc15dc9fee4b40a, 7d61d1da2ed1f682c41cae0c8d4719cdaccee5c5, dedf2a0eb9448ae73b270743e6ea9b108189df46, 194454afa6aa9d6ed74f0c57127bc8beb27c20df, 1cdb52ffd6600a37bd355d8dce58ecd03e55e618, 6.1.64 ≤ v < 6.1.191, 6.6.3 ≤ v < 6.6.160, 4.19.318 ≤ v < 4.20, 5.4.280 ≤ v < 5.5, 5.10.202 ≤ v < 5.11, 5.15.140 ≤ v < 5.16, 6.5.13 ≤ v < 6.6, 6.7 | 1a713814e0580f946196bca5e340b37991c6e8bf, f99fedfd1dbffe8d20b421c9a7d4655a135d4fcd, 59527bbfb1eabdb28e95e7c725886cc2c2899cb3, e769fcde3cc73e847b1eb3acd40c04a291cb0c0c, cdf7a233cb94774b0e7df42d9157077983f5022c, 932a8cf6abb2b2f8677b79153a823108d8861fe2, 6.1.191, 6.6.160, 4.20, 5.5, 5.11, 5.16, 6.6 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.