net: psp: avoid conflicts with skb->decrypted and sk_validate_xmit_skb()

Summary

In the Linux kernel, the following vulnerability has been resolved: net: psp: avoid conflicts with skb->decrypted and sk_validate_xmit_skb() PSP conflicts with TLS ULP in its usage of both skb->decrypted and sk->sk_validate_xmit_skb(). Make PSP mutually exclusive with TLS ULP, the only other user of either of these. As other users of skb->decrypted come along, they can be added to sk_has_decrypt_user(). It would make sense to also assert that sk->sk_validate_xmit_skb() is also NULL in both of these setup paths for similar future proofing, but the PSP listener/sk_clone() path is still broken and it could be seen as a regression to not allow rx assoc to run on a child of a listener socket with PSP tx assoc state. Include all TCP ULPs in the sk_has_decrypt_user() check, even though TLS is the only one that conflicts with PSP via the decrypted bit. This is intentional because PSP was not designed to be used with ULPs. It is best to close off surface area that may make bugs reachable, until someone wishes to design and test an actual user of PSP with ULPs.

Timeline

1. Oct 6, 2026, 8:45 AM UTCCVE published
2. Oct 19, 2026, 9:16 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 6b46ca260e2290e3453d1355ab5b6d283d73d780 · fixed in a13cca5ba5375f13cbdab545abfb5e288bef3f78; From 6b46ca260e2290e3453d1355ab5b6d283d73d780 · fixed in c8c8c18862337c469e325c207601de3279847809; From 6b46ca260e2290e3453d1355ab5b6d283d73d780 · fixed in a41f24c612c3f5139a3143307eb85bbcf1bd4d07

• Linux Linux

  6.18

• KernelLinux

  From 6.18.0 · fixed in 6.18.54; From 6.19.0 · fixed in 7.2.8

References 3