CVE-2026-31533 (GCVE-0-2026-31533)
Vulnerability from cvelistv5
Published
2026-04-23 15:11
Modified
2026-10-19 18:45
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
Version: 5.15.160   ≤
Version: 6.1.84   ≤
Version: 6.6.18   ≤
Version: 6.7.6   ≤
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The bug is in the kTLS TX path reached when a kTLS-enabled network service sends TLS records to a peer; a remote client can plausibly trigger repeated encrypted responses and connection errors over the network.\\nAC:L - The vulnerable condition is the normal async crypto backlog/error path, and an attacker can drive request volume and connection aborts/retries rather than depending on an uncontrollable race. Under the required rule, the defensible choice for a kTLS UAF is low complexity.\\nPR:N - In the network-service scenario, the attacker only needs to connect to and interact with the exposed TLS service; no local account or kernel capability is required.\\nUI:N - No user interaction is required once the vulnerable kTLS-enabled service is reachable; the attacker can trigger sends by network requests.\\nS:U - The corruption is within the kernel handling of the same host and does not cross a separate security authority such as a VM boundary.\\nC:H - This is a use-after-free of a heap-allocated tls_rec used later by an async crypto callback, giving memory corruption potential consistent with kernel information disclosure.\\nI:H - The async callback writes through fields in the freed record, so heap reuse can turn the UAF into kernel memory corruption/control-flow impact.\\nA:H - Even without full exploitation, the stale callback can dereference or modify freed memory and crash or oops the kernel.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3ade391adc584f17b5570fd205de3ad029090368\", \"lessThan\": \"414fc5e5a5aff776c150f1b86770e0a25a35df3a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cd1bbca03f3c1d845ce274c0d0a66de8e5929f72\", \"lessThan\": \"02f3ecadb23558bbe068e6504118f1b712d4ece0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"13eca403876bbea3716e82cdfe6f1e6febb38754\", \"lessThan\": \"0e43e0a3c94044acc74b8e0927c27972eb5a59e8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8590541473188741055d27b955db0777569438e3\", \"lessThan\": \"aa9facde6c5005205874c37db3fd25799d741baf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8590541473188741055d27b955db0777569438e3\", \"lessThan\": \"5d70eb25b41e9b010828cd12818b06a0c3b04412\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8590541473188741055d27b955db0777569438e3\", \"lessThan\": \"2694d408b0e595024e0fc1d64ff9db0358580f74\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8590541473188741055d27b955db0777569438e3\", \"lessThan\": \"a9b8b18364fffce4c451e6f6fd218fa4ab646705\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ab6397f072e5097f267abf5cb08a8004e6b17694\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.15.160\", \"lessThan\": \"5.15.203\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.1.84\", \"lessThan\": \"6.1.169\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.6.18\", \"lessThan\": \"6.6.135\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.7.6\", \"lessThan\": \"6.8\", \"versionType\": \"semver\"}], \"programFiles\": 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\"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/tls/tls_sw.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/414fc5e5a5aff776c150f1b86770e0a25a35df3a\"}, {\"url\": \"https://git.kernel.org/stable/c/02f3ecadb23558bbe068e6504118f1b712d4ece0\"}, {\"url\": \"https://git.kernel.org/stable/c/0e43e0a3c94044acc74b8e0927c27972eb5a59e8\"}, {\"url\": \"https://git.kernel.org/stable/c/aa9facde6c5005205874c37db3fd25799d741baf\"}, {\"url\": \"https://git.kernel.org/stable/c/5d70eb25b41e9b010828cd12818b06a0c3b04412\"}, {\"url\": \"https://git.kernel.org/stable/c/2694d408b0e595024e0fc1d64ff9db0358580f74\"}, {\"url\": \"https://git.kernel.org/stable/c/a9b8b18364fffce4c451e6f6fd218fa4ab646705\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.203\", \"versionStartIncluding\": \"5.15.160\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.169\", \"versionStartIncluding\": \"6.1.84\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.135\", \"versionStartIncluding\": \"6.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.82\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.23\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.13\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.7.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:23:20.687Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-31533\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T18:45:55.376Z\", \"dateReserved\": \"2026-03-09T15:48:24.113Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-04-23T15:11:06.955Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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