xfrm: Check for underflow in xfrm_state_mtu

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/xfrm/xfrm_state.c"
                    ],
                    "versions": [
                        {
                            "version": "c5c2523893747f88a83376abad310c8ad13f7197",
                            "lessThan": "8014f70c4e6e5ab101ae3860a614e65e988372e3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c5c2523893747f88a83376abad310c8ad13f7197",
                            "lessThan": "1021d2877b689a648b27815c854557a917122e93",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c5c2523893747f88a83376abad310c8ad13f7197",
                            "lessThan": "2a41b1b31c61c52b972278ce1732a1443f5e89ed",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c5c2523893747f88a83376abad310c8ad13f7197",
                            "lessThan": "fccd685b32df5aaf6bad4381eeda216468e283f0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c5c2523893747f88a83376abad310c8ad13f7197",
                            "lessThan": "820e501be8aee4b365d218d83227b314309c5fda",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c5c2523893747f88a83376abad310c8ad13f7197",
                            "lessThan": "82ac903e0b519849647657b8c48d21237ada06a2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c5c2523893747f88a83376abad310c8ad13f7197",
                            "lessThan": "3db50ceeacb52806d8fe86fb1dfe944df0b9f789",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c5c2523893747f88a83376abad310c8ad13f7197",
                            "lessThan": "742b04d0550b0ec89dcbc99537ec88653bd1ad90",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/xfrm/xfrm_state.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.22",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.22",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.259",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.210",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.176",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.143",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.93",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.35",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.12",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }