Critical severity · published Jul 19, 2026
CVE-2026-64025
bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
9.8
CVSS
0.3%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
sk_psock_strp_data_ready() already checks tls_sw_has_ctx_rx() and
defers to psock->saved_data_ready when a TLS RX context is present,
avoiding a conflict with the TLS strparser's ownership of the receive
queue (commit e91de6afa81c, "bpf: Fix running sk_skb program types
with ktls").
sk_psock_verdict_data_ready() has no equivalent guard. When a socket
is inserted into a sockmap (BPF_SK_SKB_VERDICT) before TLS RX is
configured, tls_sw_strparser_arm() saves sk_psock_verdict_data_ready
as rx_ctx->saved_data_ready. On data arrival:
tls_data_ready -> tls_strp_data_ready -> tls_rx_msg_ready
-> saved_data_ready() = sk_psock_verdict_data_ready()
-> tcp_read_skb() drains sk_receive_queue via __skb_unlink()
without calling tcp_eat_skb(), so copied_seq is not advanced.
tls_strp_msg_load() then finds tcp_inq() >= full_len (stale), calls
tcp_recv_skb() on the now-empty queue, hits WARN_ON_ONCE(!first), and
returns with rx_ctx->strp.anchor.frag_list pointing at a psock-owned
(potentially freed) skb. tls_decrypt_sg() subsequently walks that
frag_list: use-after-free.
Apply the same fix as sk_psock_strp_data_ready(): if a TLS RX context
is present, call psock->saved_data_ready (sock_def_readable) to wake
recv() waiters and return immediately, leaving the receive queue
untouched. TLS retains sole ownership of the queue and decrypts the
record normally through tls_sw_recvmsg().
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
5.10 before 6.6.142; 6.7 before 6.12.92; 6.13 before 6.18.34; 6.19 before 7.0.11; 7.1; 7.1; +2 more · source: NVD
LI
Linux · Linux
ef5659280eb13e8ac31c296f58cfdfa1684ac06b before c9ea01768903ae47f210cd457af1dead6de7a9c3; ef5659280eb13e8ac31c296f58cfdfa1684ac06b before 7c8cf21bc4efb4af18d6096db3f8bd06d622251c; ef5659280eb13e8ac31c296f58cfdfa1684ac06b before 1861d369efd62d67796563bf3e01fc22e5626f8b; ef5659280eb13e8ac31c296f58cfdfa1684ac06b before 8a52139560f833c3975032e1f5762611e3a36d71; ef5659280eb13e8ac31c296f58cfdfa1684ac06b before ddf8029623a1af20e984c040e89ff918158397ab; 5.10 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64025
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-64025
Patch
https://git.kernel.org/stable/c/1861d369efd62d67796563bf3e01fc22e5626f8b
Patch
https://git.kernel.org/stable/c/7c8cf21bc4efb4af18d6096db3f8bd06d622251c
Patch
https://git.kernel.org/stable/c/8a52139560f833c3975032e1f5762611e3a36d71
Patch
https://git.kernel.org/stable/c/c9ea01768903ae47f210cd457af1dead6de7a9c3
Patch
https://git.kernel.org/stable/c/ddf8029623a1af20e984c040e89ff918158397ab
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