{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.1",
    "cveMetadata": {
        "cveId": "CVE-2021-47131",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2024-03-04T18:12:48.840Z",
        "datePublished": "2024-03-15T20:14:34.647Z",
        "dateUpdated": "2024-08-04T05:24:39.881Z"
    },
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                "shortName": "Linux",
                "dateUpdated": "2024-05-29T05:02:38.064Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/tls: Fix use-after-free after the TLS device goes down and up\n\nWhen a netdev with active TLS offload goes down, tls_device_down is\ncalled to stop the offload and tear down the TLS context. However, the\nsocket stays alive, and it still points to the TLS context, which is now\ndeallocated. If a netdev goes up, while the connection is still active,\nand the data flow resumes after a number of TCP retransmissions, it will\nlead to a use-after-free of the TLS context.\n\nThis commit addresses this bug by keeping the context alive until its\nnormal destruction, and implements the necessary fallbacks, so that the\nconnection can resume in software (non-offloaded) kTLS mode.\n\nOn the TX side tls_sw_fallback is used to encrypt all packets. The RX\nside already has all the necessary fallbacks, because receiving\nnon-decrypted packets is supported. The thing needed on the RX side is\nto block resync requests, which are normally produced after receiving\nnon-decrypted packets.\n\nThe necessary synchronization is implemented for a graceful teardown:\nfirst the fallbacks are deployed, then the driver resources are released\n(it used to be possible to have a tls_dev_resync after tls_dev_del).\n\nA new flag called TLS_RX_DEV_DEGRADED is added to indicate the fallback\nmode. It's used to skip the RX resync logic completely, as it becomes\nuseless, and some objects may be released (for example, resync_async,\nwhich is allocated and freed by the driver)."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/net/tls.h",
                        "net/tls/tls_device.c",
                        "net/tls/tls_device_fallback.c",
                        "net/tls/tls_main.c"
                    ],
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                            "status": "affected",
                            "versionType": "git"
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                            "lessThan": "0f1e6fe66977",
                            "status": "affected",
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                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
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                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/net/tls.h",
                        "net/tls/tls_device.c",
                        "net/tls/tls_device_fallback.c",
                        "net/tls/tls_main.c"
                    ],
                    "versions": [
                        {
                            "version": "4.18",
                            "status": "affected"
                        },
                        {
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                            "status": "unaffected",
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                        },
                        {
                            "version": "5.10.43",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
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                        },
                        {
                            "version": "5.12.10",
                            "lessThanOrEqual": "5.12.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.13",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "references": [
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                    "url": "https://git.kernel.org/stable/c/f1d4184f128dede82a59a841658ed40d4e6d3aa2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0f1e6fe66977a864fe850522316f713d7b926fd9"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c55dcdd435aa6c6ad6ccac0a4c636d010ee367a4"
                }
            ],
            "title": "net/tls: Fix use-after-free after the TLS device goes down and up",
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                                    {
                                        "Exploitation": "none"
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                                "version": "2.0.3",
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                    "dateUpdated": "2024-08-04T05:24:39.881Z"
                },
                "title": "CVE Program Container",
                "references": [
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