{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53323", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-16T16:08:59.563Z", "datePublished": "2025-09-16T16:11:58.877Z", "dateUpdated": "2026-05-11T19:42:43.589Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:42:43.589Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next2/dax: Fix ext2_setsize when len is page aligned\n\nPAGE_ALIGN(x) macro gives the next highest value which is multiple of\npagesize. But if x is already page aligned then it simply returns x.\nSo, if x passed is 0 in dax_zero_range() function, that means the\nlength gets passed as 0 to ->iomap_begin().\n\nIn ext2 it then calls ext2_get_blocks -> max_blocks as 0 and hits bug_on\nhere in ext2_get_blocks().\n\tBUG_ON(maxblocks == 0);\n\nInstead we should be calling dax_truncate_page() here which takes\ncare of it. i.e. it only calls dax_zero_range if the offset is not\npage/block aligned.\n\nThis can be easily triggered with following on fsdax mounted pmem\ndevice.\n\ndd if=/dev/zero of=file count=1 bs=512\ntruncate -s 0 file\n\n[79.525838] EXT2-fs (pmem0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk\n[79.529376] ext2 filesystem being mounted at /mnt1/test supports timestamps until 2038 (0x7fffffff)\n[93.793207] ------------[ cut here ]------------\n[93.795102] kernel BUG at fs/ext2/inode.c:637!\n[93.796904] invalid opcode: 0000 [#1] PREEMPT SMP PTI\n[93.798659] CPU: 0 PID: 1192 Comm: truncate Not tainted 6.3.0-rc2-xfstests-00056-g131086faa369 #139\n[93.806459] RIP: 0010:ext2_get_blocks.constprop.0+0x524/0x610\n<...>\n[93.835298] Call Trace:\n[93.836253] \n[93.837103] ? lock_acquire+0xf8/0x110\n[93.838479] ? d_lookup+0x69/0xd0\n[93.839779] ext2_iomap_begin+0xa7/0x1c0\n[93.841154] iomap_iter+0xc7/0x150\n[93.842425] dax_zero_range+0x6e/0xa0\n[93.843813] ext2_setsize+0x176/0x1b0\n[93.845164] ext2_setattr+0x151/0x200\n[93.846467] notify_change+0x341/0x4e0\n[93.847805] ? lock_acquire+0xf8/0x110\n[93.849143] ? do_truncate+0x74/0xe0\n[93.850452] ? do_truncate+0x84/0xe0\n[93.851739] do_truncate+0x84/0xe0\n[93.852974] do_sys_ftruncate+0x2b4/0x2f0\n[93.854404] do_syscall_64+0x3f/0x90\n[93.855789] entry_SYSCALL_64_after_hwframe+0x72/0xdc" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ext2/inode.c" ], "versions": [ { "version": "2aa3048e03d38d5358be2553d4b638c1a018498c", "lessThan": "9e54fd14bd143c261e52fde74355e85e9526c58c", "status": "affected", "versionType": "git" }, { "version": "2aa3048e03d38d5358be2553d4b638c1a018498c", "lessThan": "5cee8bfb8cbd99c97aff85d2bf066b6a496e13ab", "status": "affected", "versionType": "git" }, { "version": "2aa3048e03d38d5358be2553d4b638c1a018498c", "lessThan": "fcced95b6ba2a507a83b8b3e0358a8ac16b13e35", "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/ext2/inode.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.40", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4.5", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5", "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": "5.15", "versionEndExcluding": "6.1.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.4.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.5" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9e54fd14bd143c261e52fde74355e85e9526c58c" }, { "url": "https://git.kernel.org/stable/c/5cee8bfb8cbd99c97aff85d2bf066b6a496e13ab" }, { "url": "https://git.kernel.org/stable/c/fcced95b6ba2a507a83b8b3e0358a8ac16b13e35" } ], "title": "ext2/dax: Fix ext2_setsize when len is page aligned", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2023-53323", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-01-14T18:28:00.441739Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-617", "description": "CWE-617 Reachable Assertion" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T18:32:58.758Z" } } ] } }