{"id":"CVE-2026-98636","revision":"f1efd9c2452045dc96b1e3f2b09259be","records":[{"revision":"f1efd9c2452045dc96b1e3f2b09259be","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98636","aliases":[],"title":"squashfs: Add dictionary size range check to prevent shift-out-of-bounds","description":"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.","state":0,"publishedAt":"2026-10-18T15:20:07.184+00:00","modifiedAt":"2026-10-19T09:23:06.005+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/squashfs/xz_wrapper.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ff750311d30acc9564ef577050794953eee59f01\",\n                            \"lessThan\": \"b02948a23455f8190a53887b2d2c13ae1d360cea\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ff750311d30acc9564ef577050794953eee59f01\",\n                            \"lessThan\": \"9d9c5c218ea356a1d88765214ad2919605280ab1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ff750311d30acc9564ef577050794953eee59f01\",\n                            \"lessThan\": \"7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ff750311d30acc9564ef577050794953eee59f01\",\n                            \"lessThan\": \"c68e0068a236f9a7dfc19720bdf11e5d80a85089\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ff750311d30acc9564ef577050794953eee59f01\",\n                            \"lessThan\": \"88c673a0bd233df44ca0020da82f4fd3876de27a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ff750311d30acc9564ef577050794953eee59f01\",\n                            \"lessThan\": \"0cb85377daaefb4ce5ce72975f2deb27ee0e0cad\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ff750311d30acc9564ef577050794953eee59f01\",\n                            \"lessThan\": \"e1ca4e3a380ef3e8f46ce006f1146392e3f32c98\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ff750311d30acc9564ef577050794953eee59f01\",\n                            \"lessThan\": \"1f7745fb3580152ca902ef181b605f33cabfb1d0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/squashfs/xz_wrapper.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.39\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.39\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.55\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.9\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/b02948a23455f8190a53887b2d2c13ae1d360cea","https://git.kernel.org/stable/c/9d9c5c218ea356a1d88765214ad2919605280ab1","https://git.kernel.org/stable/c/7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1","https://git.kernel.org/stable/c/c68e0068a236f9a7dfc19720bdf11e5d80a85089","https://git.kernel.org/stable/c/88c673a0bd233df44ca0020da82f4fd3876de27a","https://git.kernel.org/stable/c/0cb85377daaefb4ce5ce72975f2deb27ee0e0cad","https://git.kernel.org/stable/c/e1ca4e3a380ef3e8f46ce006f1146392e3f32c98","https://git.kernel.org/stable/c/1f7745fb3580152ca902ef181b605f33cabfb1d0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98636","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98636","identifiers":["CVE-2026-98636"]},"retained":false,"historicalAffected":[]}],"coverage":[]}