Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: xfrm: espintcp: fix UAF during close ZDI reported and analyzed a race condition during close for espintcp sockets: espintcp_close() frees emsg->skb via kfree_skb() without holding any socket lock. Concurrently, the xfrm_trans_reinject work queue invokes esp_output_tcp_finish() -> espintcp_push_skb() -> espintcp_push_msgs() -> skb_send_sock_locked(), which reads the same skb as a data source. Fix this by adding a synchronize_rcu() call after resetting sk_prot, since esp_output_tcp_finish() runs under RCU and won't use a socket with sk_prot == &tcp_prot. Simply taking the socket lock in espintcp_close() could lead to leaks, if esp_output_tcp_finish() re-adds an skb in the slot we just freed. After this, the existing barrier() is no longer needed.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before 29121c5e6591da527e8e36ddac7120dc527f574d; affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before ed5d9102190c45fc70121c036b0626b740040b75; affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before 4bc0dfa28dca6fc0084203732695968049c44072; affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before ff8dd7a932f34409a56e1b91a1219340f17457e9; affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before 4b31a875693c480c611519faca46216514e3e052; affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before 24efebecf415ba264adba0f0491cec436463a14f; affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before eb3bbf29c723fe75c0eb92be14f0ec92971fe272; affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before 54b41ad14da9a981131ab6e4d3f79321a503ea5d; affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before deb232e884877bf10b4ce2580909eedec986c284 |
| Linux / Linux | affected 5.6; unaffected 0 before 5.6; unaffected 5.10.269 through 5.10.*; unaffected 5.15.220 through 5.15.*; unaffected 6.1.187 through 6.1.*; unaffected 6.6.156 through 6.6.*; unaffected 6.12.108 through 6.12.*; unaffected 6.18.49 through 6.18.*; unaffected 7.1.13 through 7.1.*; unaffected 7.2.3 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/29121c5e6591da527e8e36ddac7120dc527f574d
- https://git.kernel.org/stable/c/ed5d9102190c45fc70121c036b0626b740040b75
- https://git.kernel.org/stable/c/4bc0dfa28dca6fc0084203732695968049c44072
- https://git.kernel.org/stable/c/ff8dd7a932f34409a56e1b91a1219340f17457e9
- https://git.kernel.org/stable/c/4b31a875693c480c611519faca46216514e3e052
- https://git.kernel.org/stable/c/24efebecf415ba264adba0f0491cec436463a14f
- https://git.kernel.org/stable/c/eb3bbf29c723fe75c0eb92be14f0ec92971fe272
- https://git.kernel.org/stable/c/54b41ad14da9a981131ab6e4d3f79321a503ea5d
- https://git.kernel.org/stable/c/deb232e884877bf10b4ce2580909eedec986c284