{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98636",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:25:14.361Z",
        "datePublished": "2026-10-18T15:20:07.184Z",
        "dateUpdated": "2026-10-19T09:23:06.005Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:23:06.005Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsquashfs: Add dictionary size range check to prevent shift-out-of-bounds\n\nWhen an abnormal SquashFS image (COMP_OPTS flag is 1 but dictionary size\nis 0) is mounted, and performs shift operations using dictionarysize, the\nshift exponent is -1, causing a shift-out-of-bounds.\n\nDetail as below:\nsquashfs_comp_opts(msblk, buffer, length)\n  squashfs_xz_comp_opts()\n    if (comp_opts)\n      n = ffs(opts->dict_size) - 1;<----opts->dict_size=0, n=-1\n      if (opts->dict_size != (1 << n) && opts->dict_size !=\n\t  \t(1 << n) + (1 << (n + 1))) <----shift-out-of-bounds\n\nFix it by adding a dictionary size range check before the shift operation."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/squashfs/xz_wrapper.c"
                    ],
                    "versions": [
                        {
                            "version": "ff750311d30acc9564ef577050794953eee59f01",
                            "lessThan": "b02948a23455f8190a53887b2d2c13ae1d360cea",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ff750311d30acc9564ef577050794953eee59f01",
                            "lessThan": "9d9c5c218ea356a1d88765214ad2919605280ab1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ff750311d30acc9564ef577050794953eee59f01",
                            "lessThan": "7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ff750311d30acc9564ef577050794953eee59f01",
                            "lessThan": "c68e0068a236f9a7dfc19720bdf11e5d80a85089",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ff750311d30acc9564ef577050794953eee59f01",
                            "lessThan": "88c673a0bd233df44ca0020da82f4fd3876de27a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ff750311d30acc9564ef577050794953eee59f01",
                            "lessThan": "0cb85377daaefb4ce5ce72975f2deb27ee0e0cad",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ff750311d30acc9564ef577050794953eee59f01",
                            "lessThan": "e1ca4e3a380ef3e8f46ce006f1146392e3f32c98",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ff750311d30acc9564ef577050794953eee59f01",
                            "lessThan": "1f7745fb3580152ca902ef181b605f33cabfb1d0",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/squashfs/xz_wrapper.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.39",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.39",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.271",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.222",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.189",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.158",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.112",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.55",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.9",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                    "versionEndExcluding": "5.10.271"
                                },
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                                    "vulnerable": true,
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                                    "versionEndExcluding": "7.3"
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                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/b02948a23455f8190a53887b2d2c13ae1d360cea"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9d9c5c218ea356a1d88765214ad2919605280ab1"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c68e0068a236f9a7dfc19720bdf11e5d80a85089"
                },
                {
                    "url": "https://git.kernel.org/stable/c/88c673a0bd233df44ca0020da82f4fd3876de27a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0cb85377daaefb4ce5ce72975f2deb27ee0e0cad"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e1ca4e3a380ef3e8f46ce006f1146392e3f32c98"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1f7745fb3580152ca902ef181b605f33cabfb1d0"
                }
            ],
            "title": "squashfs: Add dictionary size range check to prevent shift-out-of-bounds",
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}