CVE-2026-80846

xfrm: drop ESP-in-TCP packets with no ingress device

State: Published
Severity: Not scored
Published: Sep 4, 2026
Updated: Oct 19, 2026
Reserved: Aug 26, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

xfrm: drop ESP-in-TCP packets with no ingress device

ESP-in-TCP receives records through the TCP strparser. handle_esp() restores skb->dev from the saved skb_iif before passing the packet into the XFRM input path.

Queued TCP data can be processed after the original ingress device has been removed, for example during veth or net namespace teardown. In that case dev_get_by_index_rcu() returns NULL. The XFRM IPv4 and IPv6 input paths both expect skb->dev to be valid while building the route lookup, so queued ESP-in-TCP data can dereference a NULL device.

Drop the packet if the saved ingress device can no longer be resolved. Such a packet can no longer be routed through the normal XFRM receive path, and this preserves the existing behaviour for packets whose ingress device still exists.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 239d0f71af09dc2029fd4d730cb24b8c83aaa43aAffected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before f00235f9d12301183d61f75fbe4105506f3e5140Affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 6af5cdb03819a5ce6e945992635c6c5e91045367Affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 2dd1609cadff46c4b20ce53b91ab9cce1380456aAffected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before c296d25efbc840be24de83f56d43bc47e714ace9Affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 328e40aa774b446969c69b654c52a051a95af8a1Affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 7911e0236616487b89db6bd3ba3f408abd10eb23Affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 943d95233b8b4a88994e244fcf466f8c403d63f1Affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before e1d7c5ac1c246ce5775f604515de0a59fbf2116eAffected
LinuxLinux	5.6Affected before 5.6Not affected 5.10.269 through 5.10.Not affected 5.15.220 through 5.15.Not affected 6.1.187 through 6.1.Not affected 6.6.156 through 6.6.Not affected 6.12.108 through 6.12.Not affected 6.18.49 through 6.18.Not affected 7.1.13 through 7.1.Not affected 7.2.3 through 7.2.Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 239d0f71af09dc2029fd4d730cb24b8c83aaa43aAffected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before f00235f9d12301183d61f75fbe4105506f3e5140Affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 6af5cdb03819a5ce6e945992635c6c5e91045367Affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 2dd1609cadff46c4b20ce53b91ab9cce1380456aAffected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before c296d25efbc840be24de83f56d43bc47e714ace9Affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 328e40aa774b446969c69b654c52a051a95af8a1Affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 7911e0236616487b89db6bd3ba3f408abd10eb23Affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 943d95233b8b4a88994e244fcf466f8c403d63f1Affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before e1d7c5ac1c246ce5775f604515de0a59fbf2116eAffected

LinuxLinux

5.6Affected
before 5.6Not affected
5.10.269 through 5.10.*Not affected
5.15.220 through 5.15.*Not affected
6.1.187 through 6.1.*Not affected
6.6.156 through 6.6.*Not affected
6.12.108 through 6.12.*Not affected
6.18.49 through 6.18.*Not affected
7.1.13 through 7.1.*Not affected
7.2.3 through 7.2.*Not affected
7.3 and laterNot affected

References

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