{"id":"CVE-2026-64361","state":"PUBLISHED","title":"hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nhfs/hfsplus: fix u32 overflow in check_and_correct_requested_length\n\ncheck_and_correct_requested_length() compares (off + len) against\nnode_size using u32 arithmetic.  When the caller passes a large len\nvalue (e.g. from an underflowed subtraction in hfs_brec_remove()),\noff + len can wrap past 2^32 and produce a small result, causing the\nbounds check to pass when it should fail.\n\nFor example, with off=14 and len=0xFFFFFFF2 (underflowed from\ndata_off - keyoffset - size in hfs_brec_remove), off + len wraps to 6,\nwhich is less than a typical node_size of 512, so the check passes and\nthe subsequent memmove reads ~4GB past the node buffer.\n\nFix this by widening the addition to u64 before comparing against\nnode_size.  This prevents the u32 wrap while keeping the logic\nstraightforward.","publishedAt":"2026-07-25T08:50:17.345Z","updatedAt":"2026-08-17T04:54:07.849Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"67ecc81f6492275c9c54280532f558483c99c90e","status":"affected","lessThan":"c8dd112173c02adf539fe2ad34a45f5e0068780d","versionType":"git"},{"version":"a1a60e79502279f996e55052f50cc14919020475","status":"affected","lessThan":"fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1","versionType":"git"},{"version":"fe2891a9c43ab87d1a210d61e6438ca6936e2f62","status":"affected","lessThan":"671c3fcc2ad31c1311ea6414382a2d95104ae1b9","versionType":"git"},{"version":"384a66b89f9540a9a8cb0f48807697dfabaece4c","status":"affected","lessThan":"b6a481642ea1977be2f84dc08c5affd742c177e7","versionType":"git"},{"version":"efc095b35b23297e419c2ab4fc1ed1a8f0781a29","status":"affected","lessThan":"7399c3baee7bb622a92f0b895cd4d3009a693f2b","versionType":"git"},{"version":"a431930c9bac518bf99d6b1da526a7f37ddee8d8","status":"affected","lessThan":"607217f7ad419b53926f71e3f75001813bbc08ad","versionType":"git"},{"version":"a431930c9bac518bf99d6b1da526a7f37ddee8d8","status":"affected","lessThan":"c25d3c931a63e762fcaa9cb125b901c53b62403f","versionType":"git"},{"version":"a431930c9bac518bf99d6b1da526a7f37ddee8d8","status":"affected","lessThan":"966cb76fb2857a4242cab6ea2ea17acf818a3da7","versionType":"git"},{"version":"e7d2dc2421e821e4045775e6dc226378328de6f6","status":"affected","versionType":"git"},{"version":"fc7f732984ec91f30be3e574e0644066d07f2b78","status":"affected","versionType":"git"},{"version":"eec522fd0d28106b14a59ab2d658605febe4a3bb","status":"affected","versionType":"git"},{"version":"5.10.241","status":"affected","lessThan":"5.10.261","versionType":"semver"},{"version":"5.15.190","status":"affected","lessThan":"5.15.212","versionType":"semver"},{"version":"6.1.149","status":"affected","lessThan":"6.1.178","versionType":"semver"},{"version":"6.6.103","status":"affected","lessThan":"6.6.145","versionType":"semver"},{"version":"6.12.43","status":"affected","lessThan":"6.12.97","versionType":"semver"},{"version":"5.4.297","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"6.15.11","status":"affected","lessThan":"6.16","versionType":"semver"},{"version":"6.16.2","status":"affected","lessThan":"6.17","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/hfs/bnode.c","fs/hfsplus/hfsplus_fs.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.17","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/hfs/bnode.c","fs/hfsplus/hfsplus_fs.h"]}],"references":["https://git.kernel.org/stable/c/c8dd112173c02adf539fe2ad34a45f5e0068780d","https://git.kernel.org/stable/c/fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1","https://git.kernel.org/stable/c/671c3fcc2ad31c1311ea6414382a2d95104ae1b9","https://git.kernel.org/stable/c/b6a481642ea1977be2f84dc08c5affd742c177e7","https://git.kernel.org/stable/c/7399c3baee7bb622a92f0b895cd4d3009a693f2b","https://git.kernel.org/stable/c/607217f7ad419b53926f71e3f75001813bbc08ad","https://git.kernel.org/stable/c/c25d3c931a63e762fcaa9cb125b901c53b62403f","https://git.kernel.org/stable/c/966cb76fb2857a4242cab6ea2ea17acf818a3da7"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64361.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64361","state":"PUBLISHED","datePublished":"2026-07-25T08:50:17.345Z","dateUpdated":"2026-08-17T04:54:07.849Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.783Z"},"containers":{"cna":{"title":"hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nhfs/hfsplus: fix u32 overflow in check_and_correct_requested_length\n\ncheck_and_correct_requested_length() compares (off + len) against\nnode_size using u32 arithmetic.  When the caller passes a large len\nvalue (e.g. from an underflowed subtraction in hfs_brec_remove()),\noff + len can wrap past 2^32 and produce a small result, causing the\nbounds check to pass when it should fail.\n\nFor example, with off=14 and len=0xFFFFFFF2 (underflowed from\ndata_off - keyoffset - size in hfs_brec_remove), off + len wraps to 6,\nwhich is less than a typical node_size of 512, so the check passes and\nthe subsequent memmove reads ~4GB past the node buffer.\n\nFix this by widening the addition to u64 before comparing against\nnode_size.  This prevents the u32 wrap while keeping the logic\nstraightforward."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"67ecc81f6492275c9c54280532f558483c99c90e","status":"affected","lessThan":"c8dd112173c02adf539fe2ad34a45f5e0068780d","versionType":"git"},{"version":"a1a60e79502279f996e55052f50cc14919020475","status":"affected","lessThan":"fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1","versionType":"git"},{"version":"fe2891a9c43ab87d1a210d61e6438ca6936e2f62","status":"affected","lessThan":"671c3fcc2ad31c1311ea6414382a2d95104ae1b9","versionType":"git"},{"version":"384a66b89f9540a9a8cb0f48807697dfabaece4c","status":"affected","lessThan":"b6a481642ea1977be2f84dc08c5affd742c177e7","versionType":"git"},{"version":"efc095b35b23297e419c2ab4fc1ed1a8f0781a29","status":"affected","lessThan":"7399c3baee7bb622a92f0b895cd4d3009a693f2b","versionType":"git"},{"version":"a431930c9bac518bf99d6b1da526a7f37ddee8d8","status":"affected","lessThan":"607217f7ad419b53926f71e3f75001813bbc08ad","versionType":"git"},{"version":"a431930c9bac518bf99d6b1da526a7f37ddee8d8","status":"affected","lessThan":"c25d3c931a63e762fcaa9cb125b901c53b62403f","versionType":"git"},{"version":"a431930c9bac518bf99d6b1da526a7f37ddee8d8","status":"affected","lessThan":"966cb76fb2857a4242cab6ea2ea17acf818a3da7","versionType":"git"},{"version":"e7d2dc2421e821e4045775e6dc226378328de6f6","status":"affected","versionType":"git"},{"version":"fc7f732984ec91f30be3e574e0644066d07f2b78","status":"affected","versionType":"git"},{"version":"eec522fd0d28106b14a59ab2d658605febe4a3bb","status":"affected","versionType":"git"},{"version":"5.10.241","status":"affected","lessThan":"5.10.261","versionType":"semver"},{"version":"5.15.190","status":"affected","lessThan":"5.15.212","versionType":"semver"},{"version":"6.1.149","status":"affected","lessThan":"6.1.178","versionType":"semver"},{"version":"6.6.103","status":"affected","lessThan":"6.6.145","versionType":"semver"},{"version":"6.12.43","status":"affected","lessThan":"6.12.97","versionType":"semver"},{"version":"5.4.297","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"6.15.11","status":"affected","lessThan":"6.16","versionType":"semver"},{"version":"6.16.2","status":"affected","lessThan":"6.17","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/hfs/bnode.c","fs/hfsplus/hfsplus_fs.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.17","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/hfs/bnode.c","fs/hfsplus/hfsplus_fs.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/c8dd112173c02adf539fe2ad34a45f5e0068780d"},{"url":"https://git.kernel.org/stable/c/fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1"},{"url":"https://git.kernel.org/stable/c/671c3fcc2ad31c1311ea6414382a2d95104ae1b9"},{"url":"https://git.kernel.org/stable/c/b6a481642ea1977be2f84dc08c5affd742c177e7"},{"url":"https://git.kernel.org/stable/c/7399c3baee7bb622a92f0b895cd4d3009a693f2b"},{"url":"https://git.kernel.org/stable/c/607217f7ad419b53926f71e3f75001813bbc08ad"},{"url":"https://git.kernel.org/stable/c/c25d3c931a63e762fcaa9cb125b901c53b62403f"},{"url":"https://git.kernel.org/stable/c/966cb76fb2857a4242cab6ea2ea17acf818a3da7"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable HFS/HFS+ B-tree operations are reachable through local filesystem syscalls such as removexattr() and rename() after a crafted volume is mounted. No network protocol directly supplies the malformed B-tree metadata.\nAC:L - A crafted B-tree deterministically produces the length underflow and u32 addition wrap; no race or condition outside the attacker's control is required.\nPR:L - Although mounting HFS/HFS+ requires init-namespace CAP_SYS_ADMIN, an unprivileged user with ordinary write access to a file on an already mounted crafted volume can trigger the flaw through user.* xattr removal or permitted rename operations.\nUI:N - The attacker can invoke the triggering filesystem syscall directly once the crafted volume is mounted; no action by another user is required.\nS:U - The corruption occurs in the kernel while processing filesystem metadata and does not cross a separate virtualization, IOMMU, or other security authority boundary.\nC:H - The wrapped near-4-GiB copy performs out-of-bounds reads and, in HFS+, can walk beyond the node's page-pointer array, providing a defensible path to broad kernel-memory disclosure.\nI:H - The affected move, copy, clear, and write paths can write beyond the B-tree node buffer; the huge memmove is therefore exploitable memory corruption rather than a read-only crash.\nA:H - The enormous out-of-bounds memory operation can reliably cause a kernel oops or panic and can corrupt large regions of kernel memory, producing complete system unavailability."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:54:07.849Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.241","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.190","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.149","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.103","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.43","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.297"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}