Description
In the Linux kernel, the following vulnerability has been resolved: gtp: add synchronize_net() in gtp_newlink() error path to prevent use-after-free gtp_newlink()'s error path frees tid_hash and addr_hash without waiting for an RCU grace period after clearing sk_user_data. A concurrent gtp_encap_recv() in softirq may still hold the gtp_dev pointer obtained via rcu_dereference_sk_user_data() and access the freed memory. BUG: KASAN: slab-use-after-free in gtp0_pdp_find+0x1f6/0x200 (gtp.c:152) Call Trace: <IRQ> gtp0_pdp_find+0x1f6/0x200 gtp_encap_recv+0x527/0x24b0 udp_queue_rcv_one_skb+0x75f/0xc10 Add synchronize_net() before the kfree calls in out_hashtable, which covers all error paths from both gtp_encap_enable() and gtp_create_sockets().
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
459aa660eb1d8ce67080da1983bb81d716aa5a69 to < fcafb2b1430824bae4258c01a439ec97ca0c6973affected459aa660eb1d8ce67080da1983bb81d716aa5a69 to < 3ca3da5c305caa873ddb81e8c6b118143f6dd3d1affected459aa660eb1d8ce67080da1983bb81d716aa5a69 to < 6f815c2fb6ab20385f81c353cdad0ea3b88132afaffected459aa660eb1d8ce67080da1983bb81d716aa5a69 to < e3b9aa0773abd5d4ed90be41ce5306c146d5b09eaffected459aa660eb1d8ce67080da1983bb81d716aa5a69 to < fd8396cfecbd904468c71362f08aaa25f96d5337affected459aa660eb1d8ce67080da1983bb81d716aa5a69 to < 7677eb2cbf2cc7446de474c01a6b06277c0051e5affected459aa660eb1d8ce67080da1983bb81d716aa5a69 to < 8d85498016a5bb56339734a14c276209fa65bafcaffected459aa660eb1d8ce67080da1983bb81d716aa5a69 to < d989e22ae9802c52c56ad4284d0caf26696cf6aeaffected
Linux Linux
Default version status: affected
4.7affected0 to < 4.7unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/fcafb2b1430824bae4258c01a439ec97ca0c6973 ↗
- https://git.kernel.org/stable/c/3ca3da5c305caa873ddb81e8c6b118143f6dd3d1 ↗
- https://git.kernel.org/stable/c/6f815c2fb6ab20385f81c353cdad0ea3b88132af ↗
- https://git.kernel.org/stable/c/e3b9aa0773abd5d4ed90be41ce5306c146d5b09e ↗
- https://git.kernel.org/stable/c/fd8396cfecbd904468c71362f08aaa25f96d5337 ↗
- https://git.kernel.org/stable/c/7677eb2cbf2cc7446de474c01a6b06277c0051e5 ↗
- https://git.kernel.org/stable/c/8d85498016a5bb56339734a14c276209fa65bafc ↗
- https://git.kernel.org/stable/c/d989e22ae9802c52c56ad4284d0caf26696cf6ae ↗