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

CVE-2026-31533
CRITICAL 9.8

At a glance

Source
NVD
EPSS
EPSS 0.40 % · percentile 34 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

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Description

In 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.

Weaknesses (CWE)

References

Scores

VersionScoreVectorScored by
CVSS 3.1CRITICAL 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1CRITICAL 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected 3ade391adc584f17b5570fd205de3ad029090368 < 414fc5e5a5aff776c150f1b86770e0a25a35df3a ; affected cd1bbca03f3c1d845ce274c0d0a66de8e5929f72 < 02f3ecadb23558bbe068e6504118f1b712d4ece0 ; affected 13eca403876bbea3716e82cdfe6f1e6febb38754 < 0e43e0a3c94044acc74b8e0927c27972eb5a59e8 ; affected 8590541473188741055d27b955db0777569438e3 < aa9facde6c5005205874c37db3fd25799d741baf ; affected 8590541473188741055d27b955db0777569438e3 < 5d70eb25b41e9b010828cd12818b06a0c3b04412 ; affected 8590541473188741055d27b955db0777569438e3 < 2694d408b0e595024e0fc1d64ff9db0358580f74
Linux · Linuxaffected 6.8 ; unaffected 0 < 6.8 ; unaffected 5.15.203 ≤ 5.15.* ; unaffected 6.1.169 ≤ 6.1.* ; unaffected 6.6.135 ≤ 6.6.* ; unaffected 6.12.82 ≤ 6.12.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD