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CVE-2026-80848

xfrm: espintcp: fix UAF during close

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.269, 5.15.220, 6.1.187, 6.6.156, 6.12.108, and 3 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 · fixed in 29121c5e6591da527e8e36ddac7120dc527f574d; From e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 · fixed in ed5d9102190c45fc70121c036b0626b740040b75; From e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 · fixed in 4bc0dfa28dca6fc0084203732695968049c44072; From e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 · fixed in ff8dd7a932f34409a56e1b91a1219340f17457e9; From e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 · fixed in 4b31a875693c480c611519faca46216514e3e052; From e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 · fixed in 24efebecf415ba264adba0f0491cec436463a14f; From e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 · fixed in eb3bbf29c723fe75c0eb92be14f0ec92971fe272; From e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 · fixed in 54b41ad14da9a981131ab6e4d3f79321a503ea5d; From e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 · fixed in deb232e884877bf10b4ce2580909eedec986c284

  • Linux Linux

    5.6

  • KernelLinux

    From 5.6.0 · fixed in 5.10.269; From 5.11.0 · fixed in 5.15.220; From 5.16.0 · fixed in 6.1.187; From 6.2.0 · fixed in 6.6.156; From 6.7.0 · fixed in 6.12.108; From 6.13.0 · fixed in 6.18.49; From 6.19.0 · fixed in 7.1.13; From 7.2.0 · fixed in 7.2.3

References 9

git.kernel.org