{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46124","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-13T15:03:33.098Z","datePublished":"2026-05-28T09:35:38.887Z","dateUpdated":"2026-06-14T17:56:13.681Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-06-14T17:56:13.681Z"},"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/isofs/export.c"],"versions":[{"version":"5e7de55602c61c8ff28db075cc49c8dd6989d7e0","lessThan":"ee0024f5a7e3c73aa253869fae9650ae054093ca","status":"affected","versionType":"git"},{"version":"63d5a3e207bf315a32c7d16de6c89753a759f95a","lessThan":"31dbb4ba0f719ae7774e4c0c95172c9bf81692f5","status":"affected","versionType":"git"},{"version":"0fdafdaef796816a9ed0fd7ac812932d569d9beb","lessThan":"908a76f0b1038035e6ebb4f2293ce079f92e0a02","status":"affected","versionType":"git"},{"version":"952e7a7e317f126d0a2b879fc531b716932d5ffa","lessThan":"bb0988ed4f2e26d59bbb58f644cb3a55b7521e21","status":"affected","versionType":"git"},{"version":"56dfffea9fd3be0b3795a9ca6401e133a8427e0b","lessThan":"0a1af74ae2177bda3aee0837a0546309aa539d0d","status":"affected","versionType":"git"},{"version":"0405d4b63d082861f4eaff9d39c78ee9dc34f845","lessThan":"afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b","status":"affected","versionType":"git"},{"version":"0405d4b63d082861f4eaff9d39c78ee9dc34f845","lessThan":"4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6","status":"affected","versionType":"git"},{"version":"0405d4b63d082861f4eaff9d39c78ee9dc34f845","lessThan":"24376458138387fb251e782e624c7776e9826796","status":"affected","versionType":"git"},{"version":"ee01a309ebf598be1ff8174901ed6e91619f1749","status":"affected","versionType":"git"},{"version":"007124c896e7d4614ac1f6bd4dedb975c35a2a8e","status":"affected","versionType":"git"},{"version":"5.10.237","lessThan":"5.10.258","status":"affected","versionType":"semver"},{"version":"5.15.181","lessThan":"5.15.209","status":"affected","versionType":"semver"},{"version":"6.1.135","lessThan":"6.1.175","status":"affected","versionType":"semver"},{"version":"6.6.88","lessThan":"6.6.140","status":"affected","versionType":"semver"},{"version":"6.12.25","lessThan":"6.12.88","status":"affected","versionType":"semver"},{"version":"5.4.293","lessThan":"5.5","status":"affected","versionType":"semver"},{"version":"6.14.4","lessThan":"6.15","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/isofs/export.c"],"versions":[{"version":"6.15","status":"affected"},{"version":"0","lessThan":"6.15","status":"unaffected","versionType":"semver"},{"version":"5.10.258","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.209","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.175","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.140","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.88","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.30","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.7","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","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":"5.10.237","versionEndExcluding":"5.10.258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.181","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.135","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.88","versionEndExcluding":"6.6.140"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.25","versionEndExcluding":"6.12.88"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.18.30"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"7.0.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"7.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.293"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14.4"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/ee0024f5a7e3c73aa253869fae9650ae054093ca"},{"url":"https://git.kernel.org/stable/c/31dbb4ba0f719ae7774e4c0c95172c9bf81692f5"},{"url":"https://git.kernel.org/stable/c/908a76f0b1038035e6ebb4f2293ce079f92e0a02"},{"url":"https://git.kernel.org/stable/c/bb0988ed4f2e26d59bbb58f644cb3a55b7521e21"},{"url":"https://git.kernel.org/stable/c/0a1af74ae2177bda3aee0837a0546309aa539d0d"},{"url":"https://git.kernel.org/stable/c/afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b"},{"url":"https://git.kernel.org/stable/c/4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6"},{"url":"https://git.kernel.org/stable/c/24376458138387fb251e782e624c7776e9826796"}],"title":"isofs: validate block number from NFS file handle in isofs_export_iget","x_generator":{"engine":"bippy-1.2.0"}}}}