{"api_version":"1","generated_at":"2026-08-16T03:54:19+00:00","cve":"CVE-2026-72193","urls":{"html":"https://cve.report/CVE-2026-72193","api":"https://cve.report/api/cve/CVE-2026-72193.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72193","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72193"},"summary":{"title":"ntfs3: cap RESTART_TABLE free-chain walker at rt->used","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: cap RESTART_TABLE free-chain walker at rt->used\n\nA crafted NTFS3 disk image triggers an in-kernel infinite loop at\nmount time, hanging the mounting thread and firing the soft-lockup\nwatchdog within ~22s on multi-CPU hosts (panic with\nkernel.softlockup_panic=1).  The bug is reachable from desktop USB\nauto-mount on distributions where udisks2 routes the NTFS signature\nto the in-tree ntfs3 driver (Arch family and an increasing fraction\nof Fedora / openSUSE / RHEL deployments); CAP_SYS_ADMIN-class manual\nmount elsewhere.\n\ncheck_rstbl()'s second walker iterates the free-entry singly-linked\nlist headed by rt->first_free with no upper bound on iteration count:\n\n  for (off = ff; off;) {\n      if (off == RESTART_ENTRY_ALLOCATED)\n          return false;\n      off = le32_to_cpu(*(__le32 *)Add2Ptr(rt, off));\n      if (off > ts - sizeof(__le32))\n          return false;\n  }\n\nThe existing guards cover three exits: end-of-list (off == 0), the\nin-use marker (off == RESTART_ENTRY_ALLOCATED), and out-of-bounds\n(off > ts - sizeof(__le32)).  None of the three prevents an\nin-bounds cycle.\n\nA crafted on-disk RESTART_TABLE whose free chain contains a\nself-loop or A->B->A cycle whose offsets satisfy:\n\n  - in range [sizeof(struct RESTART_TABLE), ts - sizeof(__le32)]\n  - (off - sizeof(struct RESTART_TABLE)) % rsize == 0\n\npasses all existing guards and spins the mount-time thread forever.\nReproduced in UML by hand-forging a 2 MB NTFS3 image whose journal\nRESTART_TABLE first_free = 0x18 and whose entry at offset 0x18\nstores 0x18 as its next pointer; mount of the forged image with\nthe in-tree ntfs3 driver never returns.\n\nBound the walker by rt->used.  Each entry on a legitimate free\nchain is unique, and the total slot count is ne = le16_to_cpu\n(rt->used).  A traversal that visits more than ne slots is by\nconstruction malformed; reject it as a corrupt RESTART_TABLE.\n\nAfter this patch, mount of the forged image returns with -EINVAL\nand a log_replay failure message, and mkntfs-produced legitimate\nimages mount cleanly (verified in the same UML harness).","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:37","updated_at":"2026-08-15 06:21:37"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/d313416280d41bea272f02a6034dfa88008692a0","name":"https://git.kernel.org/stable/c/d313416280d41bea272f02a6034dfa88008692a0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0fad25687d4d3fa1fdd313d31b9cb5817c425029","name":"https://git.kernel.org/stable/c/0fad25687d4d3fa1fdd313d31b9cb5817c425029","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/29b86dbe88cbbef53bb9aaec2e279359f8c450f8","name":"https://git.kernel.org/stable/c/29b86dbe88cbbef53bb9aaec2e279359f8c450f8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8128bec895075253c779d67afdc90ae513265fca","name":"https://git.kernel.org/stable/c/8128bec895075253c779d67afdc90ae513265fca","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9611f644302c07d21bc8af97e3e06a3d30064253","name":"https://git.kernel.org/stable/c/9611f644302c07d21bc8af97e3e06a3d30064253","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7972df425687daa70d971fe6ed415e78683133dd","name":"https://git.kernel.org/stable/c/7972df425687daa70d971fe6ed415e78683133dd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7ac4c86915c24c208a0f0611b71d9676686fe756","name":"https://git.kernel.org/stable/c/7ac4c86915c24c208a0f0611b71d9676686fe756","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72193","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72193","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b46acd6a6a627d876898e1c84d3f84902264b445 8128bec895075253c779d67afdc90ae513265fca git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b46acd6a6a627d876898e1c84d3f84902264b445 7972df425687daa70d971fe6ed415e78683133dd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b46acd6a6a627d876898e1c84d3f84902264b445 7ac4c86915c24c208a0f0611b71d9676686fe756 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b46acd6a6a627d876898e1c84d3f84902264b445 29b86dbe88cbbef53bb9aaec2e279359f8c450f8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b46acd6a6a627d876898e1c84d3f84902264b445 0fad25687d4d3fa1fdd313d31b9cb5817c425029 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b46acd6a6a627d876898e1c84d3f84902264b445 d313416280d41bea272f02a6034dfa88008692a0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b46acd6a6a627d876898e1c84d3f84902264b445 9611f644302c07d21bc8af97e3e06a3d30064253 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15 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 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 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":"72193","cve":"CVE-2026-72193","epss":"0.002050000","percentile":"0.108580000","score_date":"2026-08-15","updated_at":"2026-08-16 00:00:32"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/ntfs3/fslog.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"8128bec895075253c779d67afdc90ae513265fca","status":"affected","version":"b46acd6a6a627d876898e1c84d3f84902264b445","versionType":"git"},{"lessThan":"7972df425687daa70d971fe6ed415e78683133dd","status":"affected","version":"b46acd6a6a627d876898e1c84d3f84902264b445","versionType":"git"},{"lessThan":"7ac4c86915c24c208a0f0611b71d9676686fe756","status":"affected","version":"b46acd6a6a627d876898e1c84d3f84902264b445","versionType":"git"},{"lessThan":"29b86dbe88cbbef53bb9aaec2e279359f8c450f8","status":"affected","version":"b46acd6a6a627d876898e1c84d3f84902264b445","versionType":"git"},{"lessThan":"0fad25687d4d3fa1fdd313d31b9cb5817c425029","status":"affected","version":"b46acd6a6a627d876898e1c84d3f84902264b445","versionType":"git"},{"lessThan":"d313416280d41bea272f02a6034dfa88008692a0","status":"affected","version":"b46acd6a6a627d876898e1c84d3f84902264b445","versionType":"git"},{"lessThan":"9611f644302c07d21bc8af97e3e06a3d30064253","status":"affected","version":"b46acd6a6a627d876898e1c84d3f84902264b445","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/ntfs3/fslog.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.15"},{"lessThan":"5.15","status":"unaffected","version":"0","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":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","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":"5.15.212","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"5.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: cap RESTART_TABLE free-chain walker at rt->used\n\nA crafted NTFS3 disk image triggers an in-kernel infinite loop at\nmount time, hanging the mounting thread and firing the soft-lockup\nwatchdog within ~22s on multi-CPU hosts (panic with\nkernel.softlockup_panic=1).  The bug is reachable from desktop USB\nauto-mount on distributions where udisks2 routes the NTFS signature\nto the in-tree ntfs3 driver (Arch family and an increasing fraction\nof Fedora / openSUSE / RHEL deployments); CAP_SYS_ADMIN-class manual\nmount elsewhere.\n\ncheck_rstbl()'s second walker iterates the free-entry singly-linked\nlist headed by rt->first_free with no upper bound on iteration count:\n\n  for (off = ff; off;) {\n      if (off == RESTART_ENTRY_ALLOCATED)\n          return false;\n      off = le32_to_cpu(*(__le32 *)Add2Ptr(rt, off));\n      if (off > ts - sizeof(__le32))\n          return false;\n  }\n\nThe existing guards cover three exits: end-of-list (off == 0), the\nin-use marker (off == RESTART_ENTRY_ALLOCATED), and out-of-bounds\n(off > ts - sizeof(__le32)).  None of the three prevents an\nin-bounds cycle.\n\nA crafted on-disk RESTART_TABLE whose free chain contains a\nself-loop or A->B->A cycle whose offsets satisfy:\n\n  - in range [sizeof(struct RESTART_TABLE), ts - sizeof(__le32)]\n  - (off - sizeof(struct RESTART_TABLE)) % rsize == 0\n\npasses all existing guards and spins the mount-time thread forever.\nReproduced in UML by hand-forging a 2 MB NTFS3 image whose journal\nRESTART_TABLE first_free = 0x18 and whose entry at offset 0x18\nstores 0x18 as its next pointer; mount of the forged image with\nthe in-tree ntfs3 driver never returns.\n\nBound the walker by rt->used.  Each entry on a legitimate free\nchain is unique, and the total slot count is ne = le16_to_cpu\n(rt->used).  A traversal that visits more than ne slots is by\nconstruction malformed; reject it as a corrupt RESTART_TABLE.\n\nAfter this patch, mount of the forged image returns with -EINVAL\nand a log_replay failure message, and mkntfs-produced legitimate\nimages mount cleanly (verified in the same UML harness)."}],"providerMetadata":{"dateUpdated":"2026-08-15T05:53:53.381Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/8128bec895075253c779d67afdc90ae513265fca"},{"url":"https://git.kernel.org/stable/c/7972df425687daa70d971fe6ed415e78683133dd"},{"url":"https://git.kernel.org/stable/c/7ac4c86915c24c208a0f0611b71d9676686fe756"},{"url":"https://git.kernel.org/stable/c/29b86dbe88cbbef53bb9aaec2e279359f8c450f8"},{"url":"https://git.kernel.org/stable/c/0fad25687d4d3fa1fdd313d31b9cb5817c425029"},{"url":"https://git.kernel.org/stable/c/d313416280d41bea272f02a6034dfa88008692a0"},{"url":"https://git.kernel.org/stable/c/9611f644302c07d21bc8af97e3e06a3d30064253"}],"title":"ntfs3: cap RESTART_TABLE free-chain walker at rt->used","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72193","datePublished":"2026-08-15T05:53:53.381Z","dateReserved":"2026-08-09T03:40:39.911Z","dateUpdated":"2026-08-15T05:53:53.381Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:37","lastModifiedDate":"2026-08-15 06:21:37","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72193","Ordinal":"1","Title":"ntfs3: cap RESTART_TABLE free-chain walker at rt->used","CVE":"CVE-2026-72193","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72193","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: cap RESTART_TABLE free-chain walker at rt->used\n\nA crafted NTFS3 disk image triggers an in-kernel infinite loop at\nmount time, hanging the mounting thread and firing the soft-lockup\nwatchdog within ~22s on multi-CPU hosts (panic with\nkernel.softlockup_panic=1).  The bug is reachable from desktop USB\nauto-mount on distributions where udisks2 routes the NTFS signature\nto the in-tree ntfs3 driver (Arch family and an increasing fraction\nof Fedora / openSUSE / RHEL deployments); CAP_SYS_ADMIN-class manual\nmount elsewhere.\n\ncheck_rstbl()'s second walker iterates the free-entry singly-linked\nlist headed by rt->first_free with no upper bound on iteration count:\n\n  for (off = ff; off;) {\n      if (off == RESTART_ENTRY_ALLOCATED)\n          return false;\n      off = le32_to_cpu(*(__le32 *)Add2Ptr(rt, off));\n      if (off > ts - sizeof(__le32))\n          return false;\n  }\n\nThe existing guards cover three exits: end-of-list (off == 0), the\nin-use marker (off == RESTART_ENTRY_ALLOCATED), and out-of-bounds\n(off > ts - sizeof(__le32)).  None of the three prevents an\nin-bounds cycle.\n\nA crafted on-disk RESTART_TABLE whose free chain contains a\nself-loop or A->B->A cycle whose offsets satisfy:\n\n  - in range [sizeof(struct RESTART_TABLE), ts - sizeof(__le32)]\n  - (off - sizeof(struct RESTART_TABLE)) % rsize == 0\n\npasses all existing guards and spins the mount-time thread forever.\nReproduced in UML by hand-forging a 2 MB NTFS3 image whose journal\nRESTART_TABLE first_free = 0x18 and whose entry at offset 0x18\nstores 0x18 as its next pointer; mount of the forged image with\nthe in-tree ntfs3 driver never returns.\n\nBound the walker by rt->used.  Each entry on a legitimate free\nchain is unique, and the total slot count is ne = le16_to_cpu\n(rt->used).  A traversal that visits more than ne slots is by\nconstruction malformed; reject it as a corrupt RESTART_TABLE.\n\nAfter this patch, mount of the forged image returns with -EINVAL\nand a log_replay failure message, and mkntfs-produced legitimate\nimages mount cleanly (verified in the same UML harness).","Type":"Description","Title":"ntfs3: cap RESTART_TABLE free-chain walker at rt->used"}]}}}