{"id":"CVE-2026-46124","revision":null,"records":[{"revision":"1af847fe961f4d5596cb13bd61350ffe","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-46124","aliases":[],"title":"isofs: validate block number from NFS file handle in isofs_export_iget","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nisofs: validate block number from NFS file handle in isofs_export_iget\n\nisofs_fh_to_dentry() and isofs_fh_to_parent() pass an attacker-\ncontrolled block number (ifid->block or ifid->parent_block) from\nthe NFS file handle to isofs_export_iget(), which only rejects\nblock == 0 before calling isofs_iget() and ultimately sb_bread().\nA crafted file handle with fh_len sufficient to pass the check\nadded by commit 0405d4b63d08 (\"isofs: Prevent the use of too small\nfid\") can still drive the server to read any in-range block on the\nbacking device as if it were an iso_directory_record. That earlier\nfix was assigned CVE-2025-37780.\n\nsb_bread() on an out-of-range block returns NULL cleanly via the\nEIO path, so there is no memory-safety violation. For in-range\nreads of adjacent-partition data on the same block device, the\nunrelated bytes end up in iso_inode_info fields that reach the NFS\nclient as dentry metadata. The deployment surface (isofs exported\nover NFS from loop-mounted images) is narrow and requires an\nauthenticated NFS peer, but the malformed-file-handle class is\nreportable as hardening next to the existing CVE-2025-37780 fix.\n\nReject block >= ISOFS_SB(sb)->s_nzones in isofs_export_iget() so\nthe check covers both isofs_fh_to_dentry() and isofs_fh_to_parent()\ncall sites with a single line.","state":0,"publishedAt":"2026-05-28T09:35:38.887+00:00","modifiedAt":"2026-10-19T19:36:51.382+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/isofs/export.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5e7de55602c61c8ff28db075cc49c8dd6989d7e0\",\n \"lessThan\": \"ee0024f5a7e3c73aa253869fae9650ae054093ca\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"63d5a3e207bf315a32c7d16de6c89753a759f95a\",\n \"lessThan\": \"31dbb4ba0f719ae7774e4c0c95172c9bf81692f5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"0fdafdaef796816a9ed0fd7ac812932d569d9beb\",\n \"lessThan\": \"908a76f0b1038035e6ebb4f2293ce079f92e0a02\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"952e7a7e317f126d0a2b879fc531b716932d5ffa\",\n \"lessThan\": \"bb0988ed4f2e26d59bbb58f644cb3a55b7521e21\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"56dfffea9fd3be0b3795a9ca6401e133a8427e0b\",\n \"lessThan\": \"0a1af74ae2177bda3aee0837a0546309aa539d0d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"0405d4b63d082861f4eaff9d39c78ee9dc34f845\",\n \"lessThan\": \"afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"0405d4b63d082861f4eaff9d39c78ee9dc34f845\",\n \"lessThan\": \"4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"0405d4b63d082861f4eaff9d39c78ee9dc34f845\",\n \"lessThan\": \"24376458138387fb251e782e624c7776e9826796\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ee01a309ebf598be1ff8174901ed6e91619f1749\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"007124c896e7d4614ac1f6bd4dedb975c35a2a8e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.10.237\",\n \"lessThan\": \"5.10.258\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.181\",\n \"lessThan\": \"5.15.209\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.135\",\n \"lessThan\": \"6.1.175\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.88\",\n \"lessThan\": \"6.6.140\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.25\",\n \"lessThan\": \"6.12.88\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.293\",\n \"lessThan\": \"5.5\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.14.4\",\n \"lessThan\": \"6.15\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\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/isofs/export.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.15\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.15\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.258\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.209\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.175\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.140\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.88\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.30\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.7\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/ee0024f5a7e3c73aa253869fae9650ae054093ca","https://git.kernel.org/stable/c/31dbb4ba0f719ae7774e4c0c95172c9bf81692f5","https://git.kernel.org/stable/c/908a76f0b1038035e6ebb4f2293ce079f92e0a02","https://git.kernel.org/stable/c/bb0988ed4f2e26d59bbb58f644cb3a55b7521e21","https://git.kernel.org/stable/c/0a1af74ae2177bda3aee0837a0546309aa539d0d","https://git.kernel.org/stable/c/afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b","https://git.kernel.org/stable/c/4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6","https://git.kernel.org/stable/c/24376458138387fb251e782e624c7776e9826796"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46124","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-46124","identifiers":["CVE-2026-46124"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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