CVE-2026-98261
Description
In the Linux kernel, the following vulnerability has been resolved: cifs: Fix server use-after-free in cifs_chan_skip_or_disable() When a secondary channel is no longer supported by the server, cifs_chan_skip_or_disable() drops the channel reference with cifs_put_tcp_session() and then continues to use the server pointer by calling cifs_signal_cifsd_for_reconnect() on it and reading its primary_server pointer. cifs_put_tcp_session() can drop the last reference of the channel and tear it down, so both the channel and the primary server (whose reference is also dropped by cifs_put_tcp_session()) can be freed before they are signaled for reconnect. Signal the channel and the primary server and capture the primary server pointer before dropping the channel reference with cifs_put_tcp_session().
How to fix
- Linux Linux0338489960ddad6368bce55e8adbc176c523093d, edd52eae5fcfb8433b6bb0e7cd98db438fe01227, fcc0a935bb6e37ecbf7e4335061309f896f35780, 7a1b27780b113583a94256d58dabfe7c0d9286e7, 717e0a25036b6c92cecace30913b2d874a4c22b8, 6.6.158, 6.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 50e8363ecc85da49764781da90ebffe1a657b370 ≤ v < 0338489960ddad6368bce55e8adbc176c523093d, f591062bdbf4742b7f1622173017f19e927057b0 ≤ v < edd52eae5fcfb8433b6bb0e7cd98db438fe01227, f591062bdbf4742b7f1622173017f19e927057b0 ≤ v < fcc0a935bb6e37ecbf7e4335061309f896f35780, f591062bdbf4742b7f1622173017f19e927057b0 ≤ v < 7a1b27780b113583a94256d58dabfe7c0d9286e7, f591062bdbf4742b7f1622173017f19e927057b0 ≤ v < 717e0a25036b6c92cecace30913b2d874a4c22b8, d61ba1d71ea6039eca7ada870bf3f0c3c8fc12e4, 6.6.15 ≤ v < 6.6.158, 6.7.3 ≤ v < 6.8, 6.8 | 0338489960ddad6368bce55e8adbc176c523093d, edd52eae5fcfb8433b6bb0e7cd98db438fe01227, fcc0a935bb6e37ecbf7e4335061309f896f35780, 7a1b27780b113583a94256d58dabfe7c0d9286e7, 717e0a25036b6c92cecace30913b2d874a4c22b8, 6.6.158, 6.8 |
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