{"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:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "5.10.271"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "6.12.112"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "6.18.55"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "7.2.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "7.3"}]}]}], "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"}}}}

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{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-98636", "lastModified": "2026-10-19T10:19:27.837", "metrics": {}, "published": "2026-10-18T16:17:16.700", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0cb85377daaefb4ce5ce72975f2deb27ee0e0cad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1f7745fb3580152ca902ef181b605f33cabfb1d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/88c673a0bd233df44ca0020da82f4fd3876de27a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9d9c5c218ea356a1d88765214ad2919605280ab1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b02948a23455f8190a53887b2d2c13ae1d360cea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c68e0068a236f9a7dfc19720bdf11e5d80a85089"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e1ca4e3a380ef3e8f46ce006f1146392e3f32c98"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: squashfs: Add dictionary size range check to prevent shift-out-of-bounds", "id": "2554952", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2554952"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1335", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsquashfs: Add dictionary size range check to prevent shift-out-of-bounds\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.\nDetail as below:\nsquashfs_comp_opts(msblk, buffer, length)\nsquashfs_xz_comp_opts()\nif (comp_opts)\nn = ffs(opts->dict_size) - 1;<----opts->dict_size=0, n=-1\nif (opts->dict_size != (1 << n) && opts->dict_size !=\n(1 << n) + (1 << (n + 1))) <----shift-out-of-bounds\nFix it by adding a dictionary size range check before the shift operation.", "A flaw was found in the SquashFS file system implementation in the Linux kernel. A local user could exploit this vulnerability by mounting a specially crafted SquashFS image with an invalid dictionary size. Processing this image triggers an invalid shift operation, leading to a kernel crash and resulting in a Denial of Service (DoS)."], "name": "CVE-2026-98636", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98636\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98636\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98636.mbox"], "threat_severity": "Moderate"}