CVE-2026-99171

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99171", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.399Z", "datePublished": "2026-10-28T10:35:26.598Z", "dateUpdated": "2026-10-30T12:42:35.809Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:42:35.809Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: free the sbi after a grace period\n\nIf the \"nocase\" mount option ntfs3 uses custom hash and dentry compare\nfunctions. Both access ntfs3 superblock private information in rcu\npathwalk. ntfs_put_super() and ntfs3_kill_sb() drop the info without any\nrcu delay. A lookup that's still inside the filesystem when the last\nreference to the mount is dropped causes a UAF. With a pathwalk held up\nin ntfs_d_hash() while the last reference to the mount goes away:\n\n BUG: KASAN: slab-use-after-free in ntfs_nls_to_utf16+0x752/0x940\n Read of size 8 at addr ff1100010453c850 by task walker/99\n Call Trace:\n <TASK>\n ntfs_nls_to_utf16+0x752/0x940\n ntfs_d_hash+0x22b/0x500\n link_path_walk+0x11ad/0x1d30\n path_lookupat+0x63/0xb00\n filename_lookup+0x1f1/0x5b0\n vfs_statx+0xd7/0x3b0\n [...]\n Allocated by task 95:\n __kmalloc_cache_noprof+0x249/0x560\n ntfs_init_fs_context+0x2db/0x5a0\n alloc_fs_context+0x52e/0xc70\n [...]\n Freed by task 98:\n kfree+0x1db/0x5b0\n deactivate_locked_super+0x9c/0xf0\n cleanup_mnt+0x9f/0x130\n task_work_run+0x131/0x250\n\nThe bug is currently masked by the grace period in namespace_unlock()\nfor umount(2). Keep the necessary information until the filesystem\nprivate info is freed and free it with an rcu delay.\n\nntfs3_free_sbi() now runs from an rcu callback and drops the upcase\ntable via ntfs_put_shared(). So switch s_shared_lock over to\nspin_lock_bh(). Otherwise the callback can deadlock against a task\nholding the lock on the same cpu."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ntfs3/ntfs_fs.h", "fs/ntfs3/super.c"], "versions": [{"version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "lessThan": "c39150784a801dbbfaf4fbfa284cb610552a5039", "status": "affected", "versionType": "git"}, {"version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "lessThan": "36e6753daf9bb64563dcb5a3bb22f7699d973fa2", "status": "affected", "versionType": "git"}, {"version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "lessThan": "c8b1a4840467930e01f1a9374d991d7a8a2896c1", "status": "affected", "versionType": "git"}, {"version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "lessThan": "7abecef26a9be8f9de70659a3092250461a52072", "status": "affected", "versionType": "git"}, {"version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "lessThan": "c01b091b06412d3b1b53d8c2925f6de586c8a2fc", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ntfs3/ntfs_fs.h", "fs/ntfs3/super.c"], "versions": [{"version": "6.2", "status": "affected"}, {"version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.161", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.115", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.59", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.13", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.2", "versionEndExcluding": "6.6.161"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.115"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.59"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.2.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c39150784a801dbbfaf4fbfa284cb610552a5039"}, {"url": "https://git.kernel.org/stable/c/36e6753daf9bb64563dcb5a3bb22f7699d973fa2"}, {"url": "https://git.kernel.org/stable/c/c8b1a4840467930e01f1a9374d991d7a8a2896c1"}, {"url": "https://git.kernel.org/stable/c/7abecef26a9be8f9de70659a3092250461a52072"}, {"url": "https://git.kernel.org/stable/c/c01b091b06412d3b1b53d8c2925f6de586c8a2fc"}], "title": "ntfs3: free the sbi after a grace period", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ntfs3/ntfs_fs.h", "fs/ntfs3/super.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c39150784a801dbbfaf4fbfa284cb610552a5039", "status": "affected", "version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "versionType": "git"}, {"lessThan": "36e6753daf9bb64563dcb5a3bb22f7699d973fa2", "status": "affected", "version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "versionType": "git"}, {"lessThan": "c8b1a4840467930e01f1a9374d991d7a8a2896c1", "status": "affected", "version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "versionType": "git"}, {"lessThan": "7abecef26a9be8f9de70659a3092250461a52072", "status": "affected", "version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "versionType": "git"}, {"lessThan": "c01b091b06412d3b1b53d8c2925f6de586c8a2fc", "status": "affected", "version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ntfs3/ntfs_fs.h", "fs/ntfs3/super.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.2"}, {"lessThan": "6.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.161", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.115", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.59", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.13", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: free the sbi after a grace period\n\nIf the \"nocase\" mount option ntfs3 uses custom hash and dentry compare\nfunctions. Both access ntfs3 superblock private information in rcu\npathwalk. ntfs_put_super() and ntfs3_kill_sb() drop the info without any\nrcu delay. A lookup that's still inside the filesystem when the last\nreference to the mount is dropped causes a UAF. With a pathwalk held up\nin ntfs_d_hash() while the last reference to the mount goes away:\n\n BUG: KASAN: slab-use-after-free in ntfs_nls_to_utf16+0x752/0x940\n Read of size 8 at addr ff1100010453c850 by task walker/99\n Call Trace:\n <TASK>\n ntfs_nls_to_utf16+0x752/0x940\n ntfs_d_hash+0x22b/0x500\n link_path_walk+0x11ad/0x1d30\n path_lookupat+0x63/0xb00\n filename_lookup+0x1f1/0x5b0\n vfs_statx+0xd7/0x3b0\n [...]\n Allocated by task 95:\n __kmalloc_cache_noprof+0x249/0x560\n ntfs_init_fs_context+0x2db/0x5a0\n alloc_fs_context+0x52e/0xc70\n [...]\n Freed by task 98:\n kfree+0x1db/0x5b0\n deactivate_locked_super+0x9c/0xf0\n cleanup_mnt+0x9f/0x130\n task_work_run+0x131/0x250\n\nThe bug is currently masked by the grace period in namespace_unlock()\nfor umount(2). Keep the necessary information until the filesystem\nprivate info is freed and free it with an rcu delay.\n\nntfs3_free_sbi() now runs from an rcu callback and drops the upcase\ntable via ntfs_put_shared(). So switch s_shared_lock over to\nspin_lock_bh(). Otherwise the callback can deadlock against a task\nholding the lock on the same cpu."}], "id": "CVE-2026-99171", "lastModified": "2026-10-30T13:21:50.760", "metrics": {}, "published": "2026-10-28T11:17:37.660", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/36e6753daf9bb64563dcb5a3bb22f7699d973fa2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7abecef26a9be8f9de70659a3092250461a52072"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c01b091b06412d3b1b53d8c2925f6de586c8a2fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c39150784a801dbbfaf4fbfa284cb610552a5039"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c8b1a4840467930e01f1a9374d991d7a8a2896c1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ntfs3: free the sbi after a grace period", "id": "2562759", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562759"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nntfs3: free the sbi after a grace period\nIf the \"nocase\" mount option ntfs3 uses custom hash and dentry compare\nfunctions. Both access ntfs3 superblock private information in rcu\npathwalk. ntfs_put_super() and ntfs3_kill_sb() drop the info without any\nrcu delay. A lookup that's still inside the filesystem when the last\nreference to the mount is dropped causes a UAF. With a pathwalk held up\nin ntfs_d_hash() while the last reference to the mount goes away:\nBUG: KASAN: slab-use-after-free in ntfs_nls_to_utf16+0x752/0x940\nRead of size 8 at addr ff1100010453c850 by task walker/99\nCall Trace:\n<TASK>\nntfs_nls_to_utf16+0x752/0x940\nntfs_d_hash+0x22b/0x500\nlink_path_walk+0x11ad/0x1d30\npath_lookupat+0x63/0xb00\nfilename_lookup+0x1f1/0x5b0\nvfs_statx+0xd7/0x3b0\n[...]\nAllocated by task 95:\n__kmalloc_cache_noprof+0x249/0x560\nntfs_init_fs_context+0x2db/0x5a0\nalloc_fs_context+0x52e/0xc70\n[...]\nFreed by task 98:\nkfree+0x1db/0x5b0\ndeactivate_locked_super+0x9c/0xf0\ncleanup_mnt+0x9f/0x130\ntask_work_run+0x131/0x250\nThe bug is currently masked by the grace period in namespace_unlock()\nfor umount(2). Keep the necessary information until the filesystem\nprivate info is freed and free it with an rcu delay.\nntfs3_free_sbi() now runs from an rcu callback and drops the upcase\ntable via ntfs_put_shared(). So switch s_shared_lock over to\nspin_lock_bh(). Otherwise the callback can deadlock against a task\nholding the lock on the same cpu.", "A flaw was found in the Linux kernel's NTFS3 file system driver. When an NTFS file system is mounted with case-insensitive naming, internal file system structures can be released prematurely while a lookup operation is still active. A local attacker can exploit this race condition to cause a use-after-free condition, where memory is accessed after being freed, resulting in a Denial of Service (DoS) through a kernel crash or potential memory corruption."], "name": "CVE-2026-99171", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99171\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99171\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-99171.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a3a956c78efaa202b1d75190136671cf6e87bfbe,c8b1a4840467930e01f1a9374d991d7a8a2896c1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a3a956c78efaa202b1d75190136671cf6e87bfbe,7abecef26a9be8f9de70659a3092250461a52072)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a3a956c78efaa202b1d75190136671cf6e87bfbe,c01b091b06412d3b1b53d8c2925f6de586c8a2fc)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.59,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.13,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a3a956c78efaa202b1d75190136671cf6e87bfbe,c8b1a4840467930e01f1a9374d991d7a8a2896c1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a3a956c78efaa202b1d75190136671cf6e87bfbe,7abecef26a9be8f9de70659a3092250461a52072)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a3a956c78efaa202b1d75190136671cf6e87bfbe,c01b091b06412d3b1b53d8c2925f6de586c8a2fc)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.59,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.13,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-28T12:45:16.179820+00:00", "updated": "2026-10-29T18:30:14.439654+00:00", "vendors": ["linux", "linux$PRODUCT$linux", "linux$PRODUCT$linux_kernel"]}