CVE-2026-68290
Description
In the Linux kernel, the following vulnerability has been resolved: rds: tcp: unregister sysctl before tearing down listen socket rds_tcp_exit_net() frees the per-netns RDS TCP listen socket via rds_tcp_kill_sock() before unregistering the per-netns sysctl table. Since rds_tcp_skbuf_handler() derives the netns from rtn->rds_tcp_listen_sock->sk, a concurrent sysctl write can race with netns teardown and dereference the freed socket/sk. KASAN reports the race as: BUG: KASAN: slab-use-after-free in rds_tcp_skbuf_handler+0x2aa/0x2e0 rds_tcp_skbuf_handler net/rds/tcp.c:721 proc_sys_call_handler fs/proc/proc_sysctl.c vfs_write fs/read_write.c __x64_sys_pwrite64 fs/read_write.c Fix this by unregistering the RDS TCP sysctl table before calling rds_tcp_kill_sock(). unregister_net_sysctl_table() prevents new sysctl handlers from starting and waits for in-flight handlers to finish, so the listen socket can then be released safely. The fix was tested against the linked reproducer.
How to fix
- Linux Linux66fd678eef1bc2862bde5e7a0f6106256de74f30, 80fffed08dc1c10e971066941d2daa56253f1552, 16df2d154ec82e2f7e7585b4fa154751ba37729a, 3aa13fe0c1bb7bc5312f878e61523e5d8cf3f85d, 167e54c703ccd4fa028feb568b0d1002020cff86, 6.12.101, 6.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 6f353c2230c199f343406c08482940ec5d8ba89c ≤ v < 66fd678eef1bc2862bde5e7a0f6106256de74f30, de8d6de0ee27be4b2b1e5b06f04aeacbabbba492 ≤ v < 80fffed08dc1c10e971066941d2daa56253f1552, 7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c ≤ v < 16df2d154ec82e2f7e7585b4fa154751ba37729a, 7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c ≤ v < 3aa13fe0c1bb7bc5312f878e61523e5d8cf3f85d, 7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c ≤ v < 167e54c703ccd4fa028feb568b0d1002020cff86, 33b3e09a489a31b30342b77cc55290f025d95c7e, 6.12.10 ≤ v < 6.12.101, 6.6.160 ≤ v < 6.7, 6.13 | 66fd678eef1bc2862bde5e7a0f6106256de74f30, 80fffed08dc1c10e971066941d2daa56253f1552, 16df2d154ec82e2f7e7585b4fa154751ba37729a, 3aa13fe0c1bb7bc5312f878e61523e5d8cf3f85d, 167e54c703ccd4fa028feb568b0d1002020cff86, 6.12.101, 6.7 |
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