CVE-2026-64324 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/12af328d2ee8d68e81ba612246d0b54b22d23e1f
https://git.kernel.org/stable/c/335202ab25b01fdd45889ff25eab70864686dea3
https://git.kernel.org/stable/c/5f0419457f89dce1a3f1c8e62a3adf2f39ab8168
https://git.kernel.org/stable/c/9442d75429b0c556292a7454fe888d54259f5240
https://git.kernel.org/stable/c/b54aee5652fcd7c23a0904a4623ec462c3edc70c
https://git.kernel.org/stable/c/be87de7789a82a030a4896bc7683415ec9fa6f2b
https://git.kernel.org/stable/c/fb49099206c5c57af28a157249fa7bcb5518f99e
https://git.kernel.org/stable/c/fdd6229d2ae9914c1f25d1041db0f4f312a4fa76

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: udf: validate free block extents against the partition length udf_free_blocks() checks the logical block number and count against the partition length, but drops the extent offset from that final bound. A crafted extent can pass the guard while logicalBlockNum + offset + count points past the partition, which later indexes past the space bitmap array. A single ftruncate(2) on a file backed by such an extent reliably panics the kernel. This is a local availability issue. On desktop systems where UDisks/polkit allows the active user to mount removable UDF media without CAP_SYS_ADMIN, an unprivileged local user can supply the crafted filesystem and trigger the panic by truncating a writable file on it. Systems that require root or CAP_SYS_ADMIN to mount the image have a higher prerequisite. No confidentiality or integrity impact is claimed: the reproduced primitive is an out-of-bounds read of a bitmap pointer slot followed by a kernel panic. Use the already computed logicalBlockNum + offset + count value for the partition length check. Also make load_block_bitmap() reject an out-of-range block group before indexing s_block_bitmap[], so corrupted callers cannot walk past the flexible array.
Title		udf: validate free block extents against the partition length
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/12af328d2ee8d68e81ba612246d0b54b22d23e1f https://git.kernel.org/stable/c/335202ab25b01fdd45889ff25eab70864686dea3 https://git.kernel.org/stable/c/5f0419457f89dce1a3f1c8e62a3adf2f39ab8168 https://git.kernel.org/stable/c/9442d75429b0c556292a7454fe888d54259f5240 https://git.kernel.org/stable/c/b54aee5652fcd7c23a0904a4623ec462c3edc70c https://git.kernel.org/stable/c/be87de7789a82a030a4896bc7683415ec9fa6f2b https://git.kernel.org/stable/c/fb49099206c5c57af28a157249fa7bcb5518f99e https://git.kernel.org/stable/c/fdd6229d2ae9914c1f25d1041db0f4f312a4fa76

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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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/udf/balloc.c"], "versions": [{"version": "934f815345c09c290a9b9a9cfdddc203ec2117e8", "lessThan": "fdd6229d2ae9914c1f25d1041db0f4f312a4fa76", "status": "affected", "versionType": "git"}, {"version": "22cc7323f090646c8cfb5939e6f15bdc2ed3fd27", "lessThan": "b54aee5652fcd7c23a0904a4623ec462c3edc70c", "status": "affected", "versionType": "git"}, {"version": "7c4fa9ebfce69619d132fe703dc2e2cf62a13723", "lessThan": "12af328d2ee8d68e81ba612246d0b54b22d23e1f", "status": "affected", "versionType": "git"}, {"version": "5cc9745e2ea11aef7d5c9a42bc36f6cd3e1b4cc3", "lessThan": "fb49099206c5c57af28a157249fa7bcb5518f99e", "status": "affected", "versionType": "git"}, 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"versionType": "semver"}, {"version": "5.15.165", "lessThan": "5.15.212", "status": "affected", "versionType": "semver"}, {"version": "6.1.105", "lessThan": "6.1.178", "status": "affected", "versionType": "semver"}, {"version": "6.6.46", "lessThan": "6.6.145", "status": "affected", "versionType": "semver"}, {"version": "4.19.320", "lessThan": "4.20", "status": "affected", "versionType": "semver"}, {"version": "5.4.282", "lessThan": "5.5", "status": "affected", "versionType": "semver"}, {"version": "6.10.5", "lessThan": "6.11", "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/udf/balloc.c"], "versions": [{"version": "6.11", "status": "affected"}, {"version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc1", "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": "5.10.224", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, 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