{"id":"CVE-2026-53027","state":"PUBLISHED","title":"fs/ntfs3: fix missing run load for vcn0 in attr_data_get_block_locked()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix missing run load for vcn0 in attr_data_get_block_locked()\n\nWhen a compressed or sparse attribute has its clusters frame-aligned,\nvcn is rounded down to the frame start using cmask, which can result\nin vcn != vcn0. In this case, vcn and vcn0 may reside in different\nattribute segments.\n\nThe code already handles the case where vcn is in a different segment\nby loading its runs before allocation. However, it fails to load runs\nfor vcn0 when vcn0 resides in a different segment than vcn. This causes\nrun_lookup_entry() to return SPARSE_LCN for vcn0 since its segment was\nnever loaded into the in-memory run list, triggering the WARN_ON(1).\n\nFix this by adding a missing check for vcn0 after the existing vcn\nsegment check. If vcn0 falls outside the current segment range\n[svcn, evcn1), find and load the attribute segment containing vcn0\nbefore performing the run lookup.\n\nThe following scenario triggers the bug:\n  attr_data_get_block_locked()\n    vcn = vcn0 & cmask        <- vcn != vcn0 after frame alignment\n    load runs for vcn segment <- vcn0 segment not loaded!\n    attr_allocate_clusters()  <- allocation succeeds\n    run_lookup_entry(vcn0)    <- vcn0 not in run -> SPARSE_LCN\n    WARN_ON(1)                <- bug fires here!","publishedAt":"2026-06-24T16:29:35.740Z","updatedAt":"2026-10-30T12:26:33.290Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"406a037d93b769bca248476bd14bbe548dc1ec35","status":"affected","lessThan":"543093f65318d012850e548b241f85381b14d643","versionType":"git"},{"version":"c380b52f6c5702cc4bdda5e6d456d6c19a201a0b","status":"affected","lessThan":"ea59d9dbc5504e29d420ac4aab774cbce39b0e69","versionType":"git"},{"version":"c380b52f6c5702cc4bdda5e6d456d6c19a201a0b","status":"affected","lessThan":"d68a14450783ecc5fddae957ac4e1c546dfcfb73","versionType":"git"},{"version":"c380b52f6c5702cc4bdda5e6d456d6c19a201a0b","status":"affected","lessThan":"08fad5d5a26cc55c0ecb68ac59ba3be5e31f4147","versionType":"git"},{"version":"c380b52f6c5702cc4bdda5e6d456d6c19a201a0b","status":"affected","lessThan":"2b4ae1ce613ade8a7e118fba4a5a77cd23e97e54","versionType":"git"},{"version":"c380b52f6c5702cc4bdda5e6d456d6c19a201a0b","status":"affected","lessThan":"d7ea8495fd307b58f8867acd81a1b40075b1d3ba","versionType":"git"},{"version":"6.1.132","status":"affected","lessThan":"6.1.191","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/attrib.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.2","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/attrib.c"]}],"references":["https://git.kernel.org/stable/c/543093f65318d012850e548b241f85381b14d643","https://git.kernel.org/stable/c/ea59d9dbc5504e29d420ac4aab774cbce39b0e69","https://git.kernel.org/stable/c/d68a14450783ecc5fddae957ac4e1c546dfcfb73","https://git.kernel.org/stable/c/08fad5d5a26cc55c0ecb68ac59ba3be5e31f4147","https://git.kernel.org/stable/c/2b4ae1ce613ade8a7e118fba4a5a77cd23e97e54","https://git.kernel.org/stable/c/d7ea8495fd307b58f8867acd81a1b40075b1d3ba"],"weaknesses":[],"ingestedAt":"2026-10-30T12:44:04.813Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53027.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53027","state":"PUBLISHED","datePublished":"2026-06-24T16:29:35.740Z","dateUpdated":"2026-10-30T12:26:33.290Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.379Z"},"containers":{"cna":{"title":"fs/ntfs3: fix missing run load for vcn0 in attr_data_get_block_locked()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix missing run load for vcn0 in attr_data_get_block_locked()\n\nWhen a compressed or sparse attribute has its clusters frame-aligned,\nvcn is rounded down to the frame start using cmask, which can result\nin vcn != vcn0. In this case, vcn and vcn0 may reside in different\nattribute segments.\n\nThe code already handles the case where vcn is in a different segment\nby loading its runs before allocation. However, it fails to load runs\nfor vcn0 when vcn0 resides in a different segment than vcn. This causes\nrun_lookup_entry() to return SPARSE_LCN for vcn0 since its segment was\nnever loaded into the in-memory run list, triggering the WARN_ON(1).\n\nFix this by adding a missing check for vcn0 after the existing vcn\nsegment check. If vcn0 falls outside the current segment range\n[svcn, evcn1), find and load the attribute segment containing vcn0\nbefore performing the run lookup.\n\nThe following scenario triggers the bug:\n  attr_data_get_block_locked()\n    vcn = vcn0 & cmask        <- vcn != vcn0 after frame alignment\n    load runs for vcn segment <- vcn0 segment not loaded!\n    attr_allocate_clusters()  <- allocation succeeds\n    run_lookup_entry(vcn0)    <- vcn0 not in run -> SPARSE_LCN\n    WARN_ON(1)                <- bug fires here!"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"406a037d93b769bca248476bd14bbe548dc1ec35","status":"affected","lessThan":"543093f65318d012850e548b241f85381b14d643","versionType":"git"},{"version":"c380b52f6c5702cc4bdda5e6d456d6c19a201a0b","status":"affected","lessThan":"ea59d9dbc5504e29d420ac4aab774cbce39b0e69","versionType":"git"},{"version":"c380b52f6c5702cc4bdda5e6d456d6c19a201a0b","status":"affected","lessThan":"d68a14450783ecc5fddae957ac4e1c546dfcfb73","versionType":"git"},{"version":"c380b52f6c5702cc4bdda5e6d456d6c19a201a0b","status":"affected","lessThan":"08fad5d5a26cc55c0ecb68ac59ba3be5e31f4147","versionType":"git"},{"version":"c380b52f6c5702cc4bdda5e6d456d6c19a201a0b","status":"affected","lessThan":"2b4ae1ce613ade8a7e118fba4a5a77cd23e97e54","versionType":"git"},{"version":"c380b52f6c5702cc4bdda5e6d456d6c19a201a0b","status":"affected","lessThan":"d7ea8495fd307b58f8867acd81a1b40075b1d3ba","versionType":"git"},{"version":"6.1.132","status":"affected","lessThan":"6.1.191","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/attrib.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.2","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/attrib.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/543093f65318d012850e548b241f85381b14d643"},{"url":"https://git.kernel.org/stable/c/ea59d9dbc5504e29d420ac4aab774cbce39b0e69"},{"url":"https://git.kernel.org/stable/c/d68a14450783ecc5fddae957ac4e1c546dfcfb73"},{"url":"https://git.kernel.org/stable/c/08fad5d5a26cc55c0ecb68ac59ba3be5e31f4147"},{"url":"https://git.kernel.org/stable/c/2b4ae1ce613ade8a7e118fba4a5a77cd23e97e54"},{"url":"https://git.kernel.org/stable/c/d7ea8495fd307b58f8867acd81a1b40075b1d3ba"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:26:33.290Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.132","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}