CVE-2026-31533 (GCVE-0-2026-31533)
Vulnerability from cvelistv5
Published
2026-04-23 15:11
Modified
2026-04-27 14:03
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 3ade391adc584f17b5570fd205de3ad029090368
Version: cd1bbca03f3c1d845ce274c0d0a66de8e5929f72
Version: 13eca403876bbea3716e82cdfe6f1e6febb38754
Version: 8590541473188741055d27b955db0777569438e3
Version: 8590541473188741055d27b955db0777569438e3
Version: 8590541473188741055d27b955db0777569438e3
Version: 8590541473188741055d27b955db0777569438e3
Version: ab6397f072e5097f267abf5cb08a8004e6b17694
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\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-\u003eoffset, sge-\u003elength) and decrements\nctx-\u003eencrypt_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."
        }
      ],
      "metrics": [
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
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      "providerMetadata": {
        "dateUpdated": "2026-04-27T14:03:54.811Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/414fc5e5a5aff776c150f1b86770e0a25a35df3a"
        },
        {
          "url": "https://git.kernel.org/stable/c/02f3ecadb23558bbe068e6504118f1b712d4ece0"
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          "url": "https://git.kernel.org/stable/c/0e43e0a3c94044acc74b8e0927c27972eb5a59e8"
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        {
          "url": "https://git.kernel.org/stable/c/aa9facde6c5005205874c37db3fd25799d741baf"
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/2694d408b0e595024e0fc1d64ff9db0358580f74"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9b8b18364fffce4c451e6f6fd218fa4ab646705"
        }
      ],
      "title": "net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31533",
    "datePublished": "2026-04-23T15:11:06.955Z",
    "dateReserved": "2026-03-09T15:48:24.113Z",
    "dateUpdated": "2026-04-27T14:03:54.811Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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