{"schema":"threatline.record/2","record":{"id":"CVE-2026-98636","aliases":[],"summary":"squashfs: Add dictionary size range check to prevent shift-out-of-bounds","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98636","source_modified_at":"2026-10-19T09:23:06.005Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","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"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98636","source_modified_at":"2026-10-19T09:23:06.005Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","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"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98636","source_modified_at":"2026-10-19T09:23:06.005Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"9d9c5c218ea356a1d88765214ad2919605280ab1","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98636","source_modified_at":"2026-10-19T09:23:06.005Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98636","source_modified_at":"2026-10-19T09:23:06.005Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"88c673a0bd233df44ca0020da82f4fd3876de27a","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98636","source_modified_at":"2026-10-19T09:23:06.005Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0cb85377daaefb4ce5ce72975f2deb27ee0e0cad","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98636","source_modified_at":"2026-10-19T09:23:06.005Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"1f7745fb3580152ca902ef181b605f33cabfb1d0","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00176,"percentile":0.06837,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:20:07.184Z","modified_at":"2026-10-19T09:23:06.005Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98636","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:23:06.005Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98636","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/b02948a23455f8190a53887b2d2c13ae1d360cea"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/9d9c5c218ea356a1d88765214ad2919605280ab1"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/c68e0068a236f9a7dfc19720bdf11e5d80a85089"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/88c673a0bd233df44ca0020da82f4fd3876de27a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/0cb85377daaefb4ce5ce72975f2deb27ee0e0cad"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/e1ca4e3a380ef3e8f46ce006f1146392e3f32c98"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/1f7745fb3580152ca902ef181b605f33cabfb1d0"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:23:06.005Z","content_hash":"5b55c97023b7791bbf2c995ea15933fa61c79a47b35e24032204c7828f368e9c"}}