CVE-2026-80848

CVE CVE-2026-80848EUVD EUVD-2026-71298Published 2026-09-04T15:54:58.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 5.10.269; e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <ff8dd7a932f34409a56e1b91a1219340f17457e9; 5.6; e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <4b31a875693c480c611519faca46216514e3e052; patch: 6.1.187; e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <eb3bbf29c723fe75c0eb92be14f0ec92971fe272; patch: 0; patch: 6.12.108; e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <29121c5e6591da527e8e36ddac7120dc527f574d; patch: 6.6.156; e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <ed5d9102190c45fc70121c036b0626b740040b75; patch: 7.3-rc1; e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <4bc0dfa28dca6fc0084203732695968049c44072; patch: 6.18.49; e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <deb232e884877bf10b4ce2580909eedec986c284; patch: 7.1.13; patch: 5.15.220; e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <24efebecf415ba264adba0f0491cec436463a14f; patch: 7.2.3; e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <54b41ad14da9a981131ab6e4d3f79321a503ea5d

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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