tls: reject the combination of TLS and sockmap

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Summary

CVECVE-2026-93824
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 17:17:16 UTC
Updated2026-09-25 13:17:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: tls: reject the combination of TLS and sockmap TLS and sockmap (BPF psock) integration hides a lot of latent bugs. Bugs which may be more or less relevant for real users but they are definitely exploitable. We could not find anyone actively using this integration so let's reject this config. Adding a TLS socket to a sockmap was already rejected by sk_psock_init() through the inet_csk_has_ulp() check. We need to reject the attempts to configure the TLS keys (rather than adding the ULP itself) because checking prior to the ULP installation is tricky without risking a race with sockmap getting added in parallel (sockmap does not hold the socket lock). This patch is a minimal rejection of the feature. Subsequent patch in the series will do a light dead code removal. Full cleanup would require a major rewrite of the Tx path, we don't need skmsg any more.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.052150000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d3b18ad31f93d0b6bae105c679018a1ba7daa9ca c3d4d537337f69e405a36fa561e7292ee4148bf7 git Not specified
CNA Linux Linux affected d3b18ad31f93d0b6bae105c679018a1ba7daa9ca a08e780b6cc1153cbff8be55de9ec9da809e344f git Not specified
CNA Linux Linux affected d3b18ad31f93d0b6bae105c679018a1ba7daa9ca 460e6486617c17dd19abe8f3fc67d9a6fa25f8ca git Not specified
CNA Linux Linux affected 4.20 Not specified
CNA Linux Linux unaffected 4.20 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a08e780b6cc1153cbff8be55de9ec9da809e344f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/460e6486617c17dd19abe8f3fc67d9a6fa25f8ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c3d4d537337f69e405a36fa561e7292ee4148bf7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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