{"api_version":"1","generated_at":"2026-07-24T18:35:37+00:00","cve":"CVE-2025-38415","urls":{"html":"https://cve.report/CVE-2025-38415","api":"https://cve.report/api/cve/CVE-2025-38415.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-38415","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-38415"},"summary":{"title":"Squashfs: check return result of sb_min_blocksize","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nSquashfs: check return result of sb_min_blocksize\n\nSyzkaller reports an \"UBSAN: shift-out-of-bounds in squashfs_bio_read\" bug.\n\nSyzkaller forks multiple processes which after mounting the Squashfs\nfilesystem, issues an ioctl(\"/dev/loop0\", LOOP_SET_BLOCK_SIZE, 0x8000). \nNow if this ioctl occurs at the same time another process is in the\nprocess of mounting a Squashfs filesystem on /dev/loop0, the failure\noccurs.  When this happens the following code in squashfs_fill_super()\nfails.\n\n----\nmsblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);\nmsblk->devblksize_log2 = ffz(~msblk->devblksize);\n----\n\nsb_min_blocksize() returns 0, which means msblk->devblksize is set to 0.\n\nAs a result, ffz(~msblk->devblksize) returns 64, and msblk->devblksize_log2\nis set to 64.\n\nThis subsequently causes the\n\nUBSAN: shift-out-of-bounds in fs/squashfs/block.c:195:36\nshift exponent 64 is too large for 64-bit type 'u64' (aka\n'unsigned long long')\n\nThis commit adds a check for a 0 return by sb_min_blocksize().","state":"PUBLISHED","assigner":"Linux","published_at":"2025-07-25 14:15:33","updated_at":"2026-06-18 21:16:28"},"problem_types":["CWE-787"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/295ab18c2dbce8d0ac6ecf7c5187e16e1ac8b282","name":"https://git.kernel.org/stable/c/295ab18c2dbce8d0ac6ecf7c5187e16e1ac8b282","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/db7096ea160e40d78c67fce52e7cc51bde049497","name":"https://git.kernel.org/stable/c/db7096ea160e40d78c67fce52e7cc51bde049497","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html","name":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Mailing 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Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4f99357dadbf9c979ad737156ad4c37fadf7c56b","name":"https://git.kernel.org/stable/c/4f99357dadbf9c979ad737156ad4c37fadf7c56b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5c51aa862cbeed2f3887f0382a2708956710bd68","name":"https://git.kernel.org/stable/c/5c51aa862cbeed2f3887f0382a2708956710bd68","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6abf6b78c6fb112eee495f5636ffcc350dd2ce25","name":"https://git.kernel.org/stable/c/6abf6b78c6fb112eee495f5636ffcc350dd2ce25","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/734aa85390ea693bb7eaf2240623d41b03705c84","name":"https://git.kernel.org/stable/c/734aa85390ea693bb7eaf2240623d41b03705c84","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/549f9e3d7b60d53808c98b9fde49b4f46d0524a5","name":"https://git.kernel.org/stable/c/549f9e3d7b60d53808c98b9fde49b4f46d0524a5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0aff95d9bc7fb5400ca8af507429c4b067bdb425","name":"https://git.kernel.org/stable/c/0aff95d9bc7fb5400ca8af507429c4b067bdb425","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html","name":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Mailing 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the Linux kernel, the following vulnerability has been resolved:\n\nSquashfs: check return result of sb_min_blocksize\n\nSyzkaller reports an \"UBSAN: shift-out-of-bounds in squashfs_bio_read\" bug.\n\nSyzkaller forks multiple processes which after mounting the Squashfs\nfilesystem, issues an ioctl(\"/dev/loop0\", LOOP_SET_BLOCK_SIZE, 0x8000). \nNow if this ioctl occurs at the same time another process is in the\nprocess of mounting a Squashfs filesystem on /dev/loop0, the failure\noccurs.  When this happens the following code in squashfs_fill_super()\nfails.\n\n----\nmsblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);\nmsblk->devblksize_log2 = ffz(~msblk->devblksize);\n----\n\nsb_min_blocksize() returns 0, which means msblk->devblksize is set to 0.\n\nAs a result, ffz(~msblk->devblksize) returns 64, and msblk->devblksize_log2\nis set to 64.\n\nThis subsequently causes the\n\nUBSAN: shift-out-of-bounds in fs/squashfs/block.c:195:36\nshift exponent 64 is too large for 64-bit type 'u64' (aka\n'unsigned long long')\n\nThis commit adds a check for a 0 return by sb_min_blocksize()."}],"providerMetadata":{"dateUpdated":"2026-05-11T21:27:32.721Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/db7096ea160e40d78c67fce52e7cc51bde049497"},{"url":"https://git.kernel.org/stable/c/549f9e3d7b60d53808c98b9fde49b4f46d0524a5"},{"url":"https://git.kernel.org/stable/c/5c51aa862cbeed2f3887f0382a2708956710bd68"},{"url":"https://git.kernel.org/stable/c/6abf6b78c6fb112eee495f5636ffcc350dd2ce25"},{"url":"https://git.kernel.org/stable/c/4f99357dadbf9c979ad737156ad4c37fadf7c56b"},{"url":"https://git.kernel.org/stable/c/0aff95d9bc7fb5400ca8af507429c4b067bdb425"},{"url":"https://git.kernel.org/stable/c/295ab18c2dbce8d0ac6ecf7c5187e16e1ac8b282"},{"url":"https://git.kernel.org/stable/c/734aa85390ea693bb7eaf2240623d41b03705c84"}],"title":"Squashfs: check return result of 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21:16:28","problem_types":["CWE-787"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-06-18T20:55:21.631432Z","id":"CVE-2025-38415","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA 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check return result of sb_min_blocksize","CVE":"CVE-2025-38415","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"38415","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nSquashfs: check return result of sb_min_blocksize\n\nSyzkaller reports an \"UBSAN: shift-out-of-bounds in squashfs_bio_read\" bug.\n\nSyzkaller forks multiple processes which after mounting the Squashfs\nfilesystem, issues an ioctl(\"/dev/loop0\", LOOP_SET_BLOCK_SIZE, 0x8000). \nNow if this ioctl occurs at the same time another process is in the\nprocess of mounting a Squashfs filesystem on /dev/loop0, the failure\noccurs.  When this happens the following code in squashfs_fill_super()\nfails.\n\n----\nmsblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);\nmsblk->devblksize_log2 = ffz(~msblk->devblksize);\n----\n\nsb_min_blocksize() returns 0, which means msblk->devblksize is set to 0.\n\nAs a result, ffz(~msblk->devblksize) returns 64, and msblk->devblksize_log2\nis set to 64.\n\nThis subsequently causes the\n\nUBSAN: shift-out-of-bounds in fs/squashfs/block.c:195:36\nshift exponent 64 is too large for 64-bit type 'u64' (aka\n'unsigned long long')\n\nThis commit adds a check for a 0 return by sb_min_blocksize().","Type":"Description","Title":"Squashfs: check return result of sb_min_blocksize"}]}}}