{"api_version":"1","generated_at":"2026-10-22T09:49:21+00:00","cve":"CVE-2026-98636","urls":{"html":"https://cve.report/CVE-2026-98636","api":"https://cve.report/api/cve/CVE-2026-98636.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98636","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98636"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:17:16","updated_at":"2026-10-19 10:19:27"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/88c673a0bd233df44ca0020da82f4fd3876de27a","name":"https://git.kernel.org/stable/c/88c673a0bd233df44ca0020da82f4fd3876de27a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b02948a23455f8190a53887b2d2c13ae1d360cea","name":"https://git.kernel.org/stable/c/b02948a23455f8190a53887b2d2c13ae1d360cea","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9d9c5c218ea356a1d88765214ad2919605280ab1","name":"https://git.kernel.org/stable/c/9d9c5c218ea356a1d88765214ad2919605280ab1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c68e0068a236f9a7dfc19720bdf11e5d80a85089","name":"https://git.kernel.org/stable/c/c68e0068a236f9a7dfc19720bdf11e5d80a85089","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0cb85377daaefb4ce5ce72975f2deb27ee0e0cad","name":"https://git.kernel.org/stable/c/0cb85377daaefb4ce5ce72975f2deb27ee0e0cad","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1f7745fb3580152ca902ef181b605f33cabfb1d0","name":"https://git.kernel.org/stable/c/1f7745fb3580152ca902ef181b605f33cabfb1d0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e1ca4e3a380ef3e8f46ce006f1146392e3f32c98","name":"https://git.kernel.org/stable/c/e1ca4e3a380ef3e8f46ce006f1146392e3f32c98","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1","name":"https://git.kernel.org/stable/c/7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98636","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98636","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ff750311d30acc9564ef577050794953eee59f01 b02948a23455f8190a53887b2d2c13ae1d360cea git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ff750311d30acc9564ef577050794953eee59f01 9d9c5c218ea356a1d88765214ad2919605280ab1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ff750311d30acc9564ef577050794953eee59f01 7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ff750311d30acc9564ef577050794953eee59f01 c68e0068a236f9a7dfc19720bdf11e5d80a85089 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ff750311d30acc9564ef577050794953eee59f01 88c673a0bd233df44ca0020da82f4fd3876de27a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ff750311d30acc9564ef577050794953eee59f01 0cb85377daaefb4ce5ce72975f2deb27ee0e0cad git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ff750311d30acc9564ef577050794953eee59f01 e1ca4e3a380ef3e8f46ce006f1146392e3f32c98 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ff750311d30acc9564ef577050794953eee59f01 1f7745fb3580152ca902ef181b605f33cabfb1d0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.39","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.39 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.271 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.222 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.189 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.112 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.55 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.9 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/squashfs/xz_wrapper.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b02948a23455f8190a53887b2d2c13ae1d360cea","status":"affected","version":"ff750311d30acc9564ef577050794953eee59f01","versionType":"git"},{"lessThan":"9d9c5c218ea356a1d88765214ad2919605280ab1","status":"affected","version":"ff750311d30acc9564ef577050794953eee59f01","versionType":"git"},{"lessThan":"7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1","status":"affected","version":"ff750311d30acc9564ef577050794953eee59f01","versionType":"git"},{"lessThan":"c68e0068a236f9a7dfc19720bdf11e5d80a85089","status":"affected","version":"ff750311d30acc9564ef577050794953eee59f01","versionType":"git"},{"lessThan":"88c673a0bd233df44ca0020da82f4fd3876de27a","status":"affected","version":"ff750311d30acc9564ef577050794953eee59f01","versionType":"git"},{"lessThan":"0cb85377daaefb4ce5ce72975f2deb27ee0e0cad","status":"affected","version":"ff750311d30acc9564ef577050794953eee59f01","versionType":"git"},{"lessThan":"e1ca4e3a380ef3e8f46ce006f1146392e3f32c98","status":"affected","version":"ff750311d30acc9564ef577050794953eee59f01","versionType":"git"},{"lessThan":"1f7745fb3580152ca902ef181b605f33cabfb1d0","status":"affected","version":"ff750311d30acc9564ef577050794953eee59f01","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/squashfs/xz_wrapper.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.39"},{"lessThan":"2.6.39","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.271","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.222","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.189","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.112","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.55","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.271","versionStartIncluding":"2.6.39","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.222","versionStartIncluding":"2.6.39","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.189","versionStartIncluding":"2.6.39","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"2.6.39","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"2.6.39","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.55","versionStartIncluding":"2.6.39","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.9","versionStartIncluding":"2.6.39","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"2.6.39","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-10-19T09:23:06.005Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98636","datePublished":"2026-10-18T15:20:07.184Z","dateReserved":"2026-09-25T10:25:14.361Z","dateUpdated":"2026-10-19T09:23:06.005Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-18 16:17:16","lastModifiedDate":"2026-10-19 10:19:27","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98636","Ordinal":"1","Title":"squashfs: Add dictionary size range check to prevent shift-out-o","CVE":"CVE-2026-98636","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98636","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"squashfs: Add dictionary size range check to prevent shift-out-o"}]}}}