{"id":"CVE-2026-90203","revision":"f52fe95b491745bb9cf41e62da54cbd7","records":[{"revision":"f52fe95b491745bb9cf41e62da54cbd7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90203","aliases":[],"title":"Squashfs: check block offset is not negative","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nSquashfs: check block offset is not negative\n\nIf a negative offset is read off disk (for example the offset into the\ndecompressed fragment block), this will cause squashfs_copy_data() to\nperform an out of bounds access.\n\nFix by checking if offset is negative, and returning 0.  This matches\nexisting behaviour where an offset beyond the block returns 0 bytes\ncopied.\n\nTo trigger this out of bounds access requires a crafted Squashfs\nfilesystem and CAP_SYS_ADMIN to mount it.  Unprivileged users will not be\nable to mount such a filesystem, but once mounted, an unprivileged user\ncan trigger the out of bounds access by reading the crafted file with the\nnegative offset.","state":0,"publishedAt":"2026-09-17T16:07:20.18+00:00","modifiedAt":"2026-10-19T08:59:39.333+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/cache.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"f400e12656ab518be107febfe2315fb1eab5a342\",\n                            \"lessThan\": \"b169185d5c672b989985c6c2e38cafab2548ba88\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f400e12656ab518be107febfe2315fb1eab5a342\",\n                            \"lessThan\": \"c2a126fca820ae74872da28de68dc74d4595dc4b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f400e12656ab518be107febfe2315fb1eab5a342\",\n                            \"lessThan\": \"95dadf366c117dcdca78a570e6832071deab1ecd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f400e12656ab518be107febfe2315fb1eab5a342\",\n                            \"lessThan\": \"3d2f0cb66c909ea2312cdef465165bb9a3ba2d84\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f400e12656ab518be107febfe2315fb1eab5a342\",\n                            \"lessThan\": \"bbb2218eb072b0a15dc063929200183bd23c2344\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f400e12656ab518be107febfe2315fb1eab5a342\",\n                            \"lessThan\": \"d0a3729d464fcf516416a41cf304c0c92126ee03\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f400e12656ab518be107febfe2315fb1eab5a342\",\n                            \"lessThan\": \"e4afd90bc7bf3dd477970c6c42bdd29ad3fda7fe\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f400e12656ab518be107febfe2315fb1eab5a342\",\n                            \"lessThan\": \"e300eb5002925b29be803d2661af07266cfa267e\",\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/cache.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.29\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.29\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\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":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/b169185d5c672b989985c6c2e38cafab2548ba88","https://git.kernel.org/stable/c/c2a126fca820ae74872da28de68dc74d4595dc4b","https://git.kernel.org/stable/c/95dadf366c117dcdca78a570e6832071deab1ecd","https://git.kernel.org/stable/c/3d2f0cb66c909ea2312cdef465165bb9a3ba2d84","https://git.kernel.org/stable/c/bbb2218eb072b0a15dc063929200183bd23c2344","https://git.kernel.org/stable/c/d0a3729d464fcf516416a41cf304c0c92126ee03","https://git.kernel.org/stable/c/e4afd90bc7bf3dd477970c6c42bdd29ad3fda7fe","https://git.kernel.org/stable/c/e300eb5002925b29be803d2661af07266cfa267e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90203","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90203","identifiers":["CVE-2026-90203"]},"retained":false,"historicalAffected":[]}],"coverage":[]}