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    "msgid": "<20260429214512.15496-1-tim.whisonant@canonical.com>",
    "date": "2026-04-29T21:45:08",
    "name": "[SRU,J/N/Q,0/1] CVE-2026-31533",
    "submitter": {
        "id": 89903,
        "url": "http://patchwork.ozlabs.org/api/1.1/people/89903/?format=api",
        "name": "Tim Whisonant",
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            "date": "2026-04-29T21:45:08",
            "name": "CVE-2026-31533",
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        ],
        "From": "Tim Whisonant <tim.whisonant@canonical.com>",
        "To": "kernel-team@lists.ubuntu.com",
        "Subject": "[SRU][J/N/Q][PATCH 0/1] CVE-2026-31533",
        "Date": "Wed, 29 Apr 2026 14:45:08 -0700",
        "Message-ID": "<20260429214512.15496-1-tim.whisonant@canonical.com>",
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    },
    "content": "SRU Justification:\n\n[Impact]\n\nnet/tls: fix use-after-free in -EBUSY error path of tls_do_encryption\n\nThe -EBUSY handling in tls_do_encryption(), introduced by commit\n859054147318 (\"net: tls: handle backlogging of crypto requests\"), has\na use-after-free due to double cleanup of encrypt_pending and the\nscatterlist entry.\n\nWhen crypto_aead_encrypt() returns -EBUSY, the request is enqueued to\nthe cryptd backlog and the async callback tls_encrypt_done() will be\ninvoked upon completion. That callback unconditionally restores the\nscatterlist entry (sge->offset, sge->length) and decrements\nctx->encrypt_pending. However, if tls_encrypt_async_wait() returns an\nerror, the synchronous error path in tls_do_encryption() performs the\nsame cleanup again, double-decrementing encrypt_pending and\ndouble-restoring the scatterlist.\n\nThe double-decrement corrupts the encrypt_pending sentinel (initialized\nto 1), making tls_encrypt_async_wait() permanently skip the wait for\npending async callbacks. A subsequent sendmsg can then free the\ntls_rec via bpf_exec_tx_verdict() while a cryptd callback is still\npending, resulting in a use-after-free when the callback fires on the\nfreed record.\n\nFix this by skipping the synchronous cleanup when the -EBUSY async\nwait returns an error, since the callback has already handled\nencrypt_pending and sge restoration.\n\n[Fix]\n\nResolute: not affected\nQuesting: applied Jammy patch\nNoble:    applied Jammy patch\nJammy:    cherry picked from upstream\nFocal:    sent to forgejo\nBionic:   not affected\nXenial:   not affected\nTrusty:   not affected\n\n[Test Plan]\n\nCompile and boot tested.\n\n[Where problems could occur]\n\nThe change affects the main encryption function for software-\nbased kernel TLS in order to correct a use-after-free. Issues\nmight manifest as failed or aborted encryption requests.\n\nMuhammad Alifa Ramdhan (1):\n  net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption\n\n net/tls/tls_sw.c | 10 ++++++++++\n 1 file changed, 10 insertions(+)"
}