{"api_version":"1","generated_at":"2026-07-26T17:03:35+00:00","cve":"CVE-2026-64324","urls":{"html":"https://cve.report/CVE-2026-64324","api":"https://cve.report/api/cve/CVE-2026-64324.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64324","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64324"},"summary":{"title":"udf: validate free block extents against the partition length","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nudf: validate free block extents against the partition length\n\nudf_free_blocks() checks the logical block number and count against the\npartition length, but drops the extent offset from that final bound.  A\ncrafted extent can pass the guard while logicalBlockNum + offset + count\npoints past the partition, which later indexes past the space bitmap\narray.\n\nA single ftruncate(2) on a file backed by such an extent reliably\npanics the kernel.  This is a local availability issue.  On desktop\nsystems where UDisks/polkit allows the active user to mount removable\nUDF media without CAP_SYS_ADMIN, an unprivileged local user can supply\nthe crafted filesystem and trigger the panic by truncating a writable\nfile on it.  Systems that require root or CAP_SYS_ADMIN to mount the\nimage have a higher prerequisite.\n\nNo confidentiality or integrity impact is claimed: the reproduced\nprimitive is an out-of-bounds read of a bitmap pointer slot followed by\na kernel panic.\n\nUse the already computed logicalBlockNum + offset + count value for the\npartition length check.  Also make load_block_bitmap() reject an\nout-of-range block group before indexing s_block_bitmap[], so corrupted\ncallers cannot walk past the flexible array.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:13","updated_at":"2026-07-25 10:17:13"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/fdd6229d2ae9914c1f25d1041db0f4f312a4fa76","name":"https://git.kernel.org/stable/c/fdd6229d2ae9914c1f25d1041db0f4f312a4fa76","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/12af328d2ee8d68e81ba612246d0b54b22d23e1f","name":"https://git.kernel.org/stable/c/12af328d2ee8d68e81ba612246d0b54b22d23e1f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b54aee5652fcd7c23a0904a4623ec462c3edc70c","name":"https://git.kernel.org/stable/c/b54aee5652fcd7c23a0904a4623ec462c3edc70c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/335202ab25b01fdd45889ff25eab70864686dea3","name":"https://git.kernel.org/stable/c/335202ab25b01fdd45889ff25eab70864686dea3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5f0419457f89dce1a3f1c8e62a3adf2f39ab8168","name":"https://git.kernel.org/stable/c/5f0419457f89dce1a3f1c8e62a3adf2f39ab8168","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fb49099206c5c57af28a157249fa7bcb5518f99e","name":"https://git.kernel.org/stable/c/fb49099206c5c57af28a157249fa7bcb5518f99e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/be87de7789a82a030a4896bc7683415ec9fa6f2b","name":"https://git.kernel.org/stable/c/be87de7789a82a030a4896bc7683415ec9fa6f2b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9442d75429b0c556292a7454fe888d54259f5240","name":"https://git.kernel.org/stable/c/9442d75429b0c556292a7454fe888d54259f5240","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64324","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64324","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 934f815345c09c290a9b9a9cfdddc203ec2117e8 fdd6229d2ae9914c1f25d1041db0f4f312a4fa76 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 22cc7323f090646c8cfb5939e6f15bdc2ed3fd27 b54aee5652fcd7c23a0904a4623ec462c3edc70c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7c4fa9ebfce69619d132fe703dc2e2cf62a13723 12af328d2ee8d68e81ba612246d0b54b22d23e1f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5cc9745e2ea11aef7d5c9a42bc36f6cd3e1b4cc3 fb49099206c5c57af28a157249fa7bcb5518f99e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 56e69e59751d20993f243fb7dd6991c4e522424c 9442d75429b0c556292a7454fe888d54259f5240 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 56e69e59751d20993f243fb7dd6991c4e522424c 335202ab25b01fdd45889ff25eab70864686dea3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 56e69e59751d20993f243fb7dd6991c4e522424c be87de7789a82a030a4896bc7683415ec9fa6f2b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 56e69e59751d20993f243fb7dd6991c4e522424c 5f0419457f89dce1a3f1c8e62a3adf2f39ab8168 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 097420e48e30f51e8f4f650b5c946f5af63ec1a3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5def895b42ef16a2da6402818cba8d7ec8ede1ef git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 05fb2bf477d3fe5421bd4cb699574737f52bd88b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.224 5.10.261 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.165 5.15.212 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.105 6.1.178 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.46 6.6.145 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.19.320 4.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.4.282 5.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.10.5 6.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.11","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.261 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.96 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.39 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64324","cve":"CVE-2026-64324","epss":"0.002100000","percentile":"0.113270000","score_date":"2026-07-25","updated_at":"2026-07-26 00:12:33"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/udf/balloc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"fdd6229d2ae9914c1f25d1041db0f4f312a4fa76","status":"affected","version":"934f815345c09c290a9b9a9cfdddc203ec2117e8","versionType":"git"},{"lessThan":"b54aee5652fcd7c23a0904a4623ec462c3edc70c","status":"affected","version":"22cc7323f090646c8cfb5939e6f15bdc2ed3fd27","versionType":"git"},{"lessThan":"12af328d2ee8d68e81ba612246d0b54b22d23e1f","status":"affected","version":"7c4fa9ebfce69619d132fe703dc2e2cf62a13723","versionType":"git"},{"lessThan":"fb49099206c5c57af28a157249fa7bcb5518f99e","status":"affected","version":"5cc9745e2ea11aef7d5c9a42bc36f6cd3e1b4cc3","versionType":"git"},{"lessThan":"9442d75429b0c556292a7454fe888d54259f5240","status":"affected","version":"56e69e59751d20993f243fb7dd6991c4e522424c","versionType":"git"},{"lessThan":"335202ab25b01fdd45889ff25eab70864686dea3","status":"affected","version":"56e69e59751d20993f243fb7dd6991c4e522424c","versionType":"git"},{"lessThan":"be87de7789a82a030a4896bc7683415ec9fa6f2b","status":"affected","version":"56e69e59751d20993f243fb7dd6991c4e522424c","versionType":"git"},{"lessThan":"5f0419457f89dce1a3f1c8e62a3adf2f39ab8168","status":"affected","version":"56e69e59751d20993f243fb7dd6991c4e522424c","versionType":"git"},{"status":"affected","version":"097420e48e30f51e8f4f650b5c946f5af63ec1a3","versionType":"git"},{"status":"affected","version":"5def895b42ef16a2da6402818cba8d7ec8ede1ef","versionType":"git"},{"status":"affected","version":"05fb2bf477d3fe5421bd4cb699574737f52bd88b","versionType":"git"},{"lessThan":"5.10.261","status":"affected","version":"5.10.224","versionType":"semver"},{"lessThan":"5.15.212","status":"affected","version":"5.15.165","versionType":"semver"},{"lessThan":"6.1.178","status":"affected","version":"6.1.105","versionType":"semver"},{"lessThan":"6.6.145","status":"affected","version":"6.6.46","versionType":"semver"},{"lessThan":"4.20","status":"affected","version":"4.19.320","versionType":"semver"},{"lessThan":"5.5","status":"affected","version":"5.4.282","versionType":"semver"},{"lessThan":"6.11","status":"affected","version":"6.10.5","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/udf/balloc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.11"},{"lessThan":"6.11","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.261","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.96","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.261","versionStartIncluding":"5.10.224","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"5.15.165","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"6.1.105","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"6.6.46","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.96","versionStartIncluding":"6.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"6.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"6.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"6.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.320","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.282","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10.5","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nudf: validate free block extents against the partition length\n\nudf_free_blocks() checks the logical block number and count against the\npartition length, but drops the extent offset from that final bound.  A\ncrafted extent can pass the guard while logicalBlockNum + offset + count\npoints past the partition, which later indexes past the space bitmap\narray.\n\nA single ftruncate(2) on a file backed by such an extent reliably\npanics the kernel.  This is a local availability issue.  On desktop\nsystems where UDisks/polkit allows the active user to mount removable\nUDF media without CAP_SYS_ADMIN, an unprivileged local user can supply\nthe crafted filesystem and trigger the panic by truncating a writable\nfile on it.  Systems that require root or CAP_SYS_ADMIN to mount the\nimage have a higher prerequisite.\n\nNo confidentiality or integrity impact is claimed: the reproduced\nprimitive is an out-of-bounds read of a bitmap pointer slot followed by\na kernel panic.\n\nUse the already computed logicalBlockNum + offset + count value for the\npartition length check.  Also make load_block_bitmap() reject an\nout-of-range block group before indexing s_block_bitmap[], so corrupted\ncallers cannot walk past the flexible array."}],"providerMetadata":{"dateUpdated":"2026-07-25T08:49:52.063Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/fdd6229d2ae9914c1f25d1041db0f4f312a4fa76"},{"url":"https://git.kernel.org/stable/c/b54aee5652fcd7c23a0904a4623ec462c3edc70c"},{"url":"https://git.kernel.org/stable/c/12af328d2ee8d68e81ba612246d0b54b22d23e1f"},{"url":"https://git.kernel.org/stable/c/fb49099206c5c57af28a157249fa7bcb5518f99e"},{"url":"https://git.kernel.org/stable/c/9442d75429b0c556292a7454fe888d54259f5240"},{"url":"https://git.kernel.org/stable/c/335202ab25b01fdd45889ff25eab70864686dea3"},{"url":"https://git.kernel.org/stable/c/be87de7789a82a030a4896bc7683415ec9fa6f2b"},{"url":"https://git.kernel.org/stable/c/5f0419457f89dce1a3f1c8e62a3adf2f39ab8168"}],"title":"udf: validate free block extents against the partition length","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64324","datePublished":"2026-07-25T08:49:52.063Z","dateReserved":"2026-07-19T15:36:31.780Z","dateUpdated":"2026-07-25T08:49:52.063Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:13","lastModifiedDate":"2026-07-25 10:17:13","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64324","Ordinal":"1","Title":"udf: validate free block extents against the partition length","CVE":"CVE-2026-64324","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64324","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nudf: validate free block extents against the partition length\n\nudf_free_blocks() checks the logical block number and count against the\npartition length, but drops the extent offset from that final bound.  A\ncrafted extent can pass the guard while logicalBlockNum + offset + count\npoints past the partition, which later indexes past the space bitmap\narray.\n\nA single ftruncate(2) on a file backed by such an extent reliably\npanics the kernel.  This is a local availability issue.  On desktop\nsystems where UDisks/polkit allows the active user to mount removable\nUDF media without CAP_SYS_ADMIN, an unprivileged local user can supply\nthe crafted filesystem and trigger the panic by truncating a writable\nfile on it.  Systems that require root or CAP_SYS_ADMIN to mount the\nimage have a higher prerequisite.\n\nNo confidentiality or integrity impact is claimed: the reproduced\nprimitive is an out-of-bounds read of a bitmap pointer slot followed by\na kernel panic.\n\nUse the already computed logicalBlockNum + offset + count value for the\npartition length check.  Also make load_block_bitmap() reject an\nout-of-range block group before indexing s_block_bitmap[], so corrupted\ncallers cannot walk past the flexible array.","Type":"Description","Title":"udf: validate free block extents against the partition length"}]}}}