net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption

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Summary

CVECVE-2026-31533
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-23 18:16:26 UTC
Updated2026-04-29 14:51:25 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption The -EBUSY handling in tls_do_encryption(), introduced by commit 859054147318 ("net: tls: handle backlogging of crypto requests"), has a use-after-free due to double cleanup of encrypt_pending and the scatterlist entry. When crypto_aead_encrypt() returns -EBUSY, the request is enqueued to the cryptd backlog and the async callback tls_encrypt_done() will be invoked upon completion. That callback unconditionally restores the scatterlist entry (sge->offset, sge->length) and decrements ctx->encrypt_pending. However, if tls_encrypt_async_wait() returns an error, the synchronous error path in tls_do_encryption() performs the same cleanup again, double-decrementing encrypt_pending and double-restoring the scatterlist. The double-decrement corrupts the encrypt_pending sentinel (initialized to 1), making tls_encrypt_async_wait() permanently skip the wait for pending async callbacks. A subsequent sendmsg can then free the tls_rec via bpf_exec_tx_verdict() while a cryptd callback is still pending, resulting in a use-after-free when the callback fires on the freed record. Fix this by skipping the synchronous cleanup when the -EBUSY async wait returns an error, since the callback has already handled encrypt_pending and sge restoration.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000140000 probability, percentile 0.026660000 (date 2026-04-27)

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3ade391adc584f17b5570fd205de3ad029090368 414fc5e5a5aff776c150f1b86770e0a25a35df3a git Not specified
CNA Linux Linux affected cd1bbca03f3c1d845ce274c0d0a66de8e5929f72 02f3ecadb23558bbe068e6504118f1b712d4ece0 git Not specified
CNA Linux Linux affected 13eca403876bbea3716e82cdfe6f1e6febb38754 0e43e0a3c94044acc74b8e0927c27972eb5a59e8 git Not specified
CNA Linux Linux affected 8590541473188741055d27b955db0777569438e3 aa9facde6c5005205874c37db3fd25799d741baf git Not specified
CNA Linux Linux affected 8590541473188741055d27b955db0777569438e3 5d70eb25b41e9b010828cd12818b06a0c3b04412 git Not specified
CNA Linux Linux affected 8590541473188741055d27b955db0777569438e3 2694d408b0e595024e0fc1d64ff9db0358580f74 git Not specified
CNA Linux Linux affected 8590541473188741055d27b955db0777569438e3 a9b8b18364fffce4c451e6f6fd218fa4ab646705 git Not specified
CNA Linux Linux affected ab6397f072e5097f267abf5cb08a8004e6b17694 git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.169 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.135 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.82 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.23 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.13 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/02f3ecadb23558bbe068e6504118f1b712d4ece0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/414fc5e5a5aff776c150f1b86770e0a25a35df3a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5d70eb25b41e9b010828cd12818b06a0c3b04412 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2694d408b0e595024e0fc1d64ff9db0358580f74 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0e43e0a3c94044acc74b8e0927c27972eb5a59e8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a9b8b18364fffce4c451e6f6fd218fa4ab646705 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/aa9facde6c5005205874c37db3fd25799d741baf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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