CVE-2026-53341

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There is no network or adjacent attack path.\nAC:L - The attacker can control both sides of the race by running concurrent local threads that call `open_by_handle_at()` and close the cloned mount file. Although the bug requires preemption or strict RCU grace periods, those are reasonable kernel configurations and the race is attacker-driven.\nPR:L - The path requires namespace-relative capabilities such as `CAP_SYS_ADMIN` and `CAP_DAC_READ_SEARCH`, which an unprivileged local user can obtain inside a user namespace on systems where unprivileged user namespaces are enabled. It does not require real init-namespace root.\nUI:N - No victim action is required; the attacker directly invokes the relevant syscalls and controls the racing threads. The mount clone, handle input, and close operation are all attacker initiated.\nS:U - The vulnerability affects kernel VFS/mount namespace state within the same security authority. It is a local kernel memory-safety issue, not a VM escape or cross-scope boundary bypass.\nC:H - The bug is a kernel use-after-free of `struct mnt_namespace`, followed by dereferencing reclaimed memory through `mnt_ns->user_ns` and capability-walk fields. Per the higher-severity rule for kernel UAFs, this is scored as high confidentiality impact.\nI:H - The immediate operation is a stale read in an authorization check, but reclaimed kernel heap contents can influence capability-check control flow and UAFs are treated as potentially exploitable memory corruption. Under the required uncertainty rule, integrity impact is high.\nA:H - The stale `mnt_namespace` dereference can crash the kernel, loop indefinitely, or otherwise destabilize the system. A local attacker can repeatedly trigger the race, so availability impact is high."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/fhandle.c", "fs/mount.h", "fs/namespace.c"], "versions": [{"version": "620c266f394932e5decc4b34683a75dfc59dc2f4", "lessThan": "15ea8dc42a02259d49dee38a658d40f60fcd75ed", "status": "affected", "versionType": "git"}, {"version": "620c266f394932e5decc4b34683a75dfc59dc2f4", "lessThan": "32138633e51e6db59e474765cf93268c92b42888", "status": "affected", "versionType": "git"}, {"version": "620c266f394932e5decc4b34683a75dfc59dc2f4", "lessThan": "a8ed2c29fcfdac78db96c9da4e659c8a513f2a94", "status": "affected", "versionType": "git"}, {"version": "620c266f394932e5decc4b34683a75dfc59dc2f4", "lessThan": "40ab6644b99685755f740b872c00ef40d9aa870e", "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/fhandle.c", "fs/mount.h", "fs/namespace.c"], "versions": [{"version": "6.11", "status": "affected"}, {"version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.95", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.11", "versionEndExcluding": "6.12.95"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.18.36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/15ea8dc42a02259d49dee38a658d40f60fcd75ed"}, {"url": "https://git.kernel.org/stable/c/32138633e51e6db59e474765cf93268c92b42888"}, {"url": "https://git.kernel.org/stable/c/a8ed2c29fcfdac78db96c9da4e659c8a513f2a94"}, {"url": "https://git.kernel.org/stable/c/40ab6644b99685755f740b872c00ef40d9aa870e"}], "title": "fhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-53341", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:28:32.016897Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:07:43.543Z"}}]}}

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There is no network or adjacent attack path.\nAC:L - The attacker can control both sides of the race by running concurrent local threads that call `open_by_handle_at()` and close the cloned mount file. Although the bug requires preemption or strict RCU grace periods, those are reasonable kernel configurations and the race is attacker-driven.\nPR:L - The path requires namespace-relative capabilities such as `CAP_SYS_ADMIN` and `CAP_DAC_READ_SEARCH`, which an unprivileged local user can obtain inside a user namespace on systems where unprivileged user namespaces are enabled. It does not require real init-namespace root.\nUI:N - No victim action is required; the attacker directly invokes the relevant syscalls and controls the racing threads. The mount clone, handle input, and close operation are all attacker initiated.\nS:U - The vulnerability affects kernel VFS/mount namespace state within the same security authority. It is a local kernel memory-safety issue, not a VM escape or cross-scope boundary bypass.\nC:H - The bug is a kernel use-after-free of `struct mnt_namespace`, followed by dereferencing reclaimed memory through `mnt_ns->user_ns` and capability-walk fields. Per the higher-severity rule for kernel UAFs, this is scored as high confidentiality impact.\nI:H - The immediate operation is a stale read in an authorization check, but reclaimed kernel heap contents can influence capability-check control flow and UAFs are treated as potentially exploitable memory corruption. Under the required uncertainty rule, integrity impact is high.\nA:H - The stale `mnt_namespace` dereference can crash the kernel, loop indefinitely, or otherwise destabilize the system. A local attacker can repeatedly trigger the race, so availability impact is high."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "620c266f394932e5decc4b34683a75dfc59dc2f4", "lessThan": "15ea8dc42a02259d49dee38a658d40f60fcd75ed", "versionType": "git"}, {"status": "affected", "version": "620c266f394932e5decc4b34683a75dfc59dc2f4", "lessThan": "32138633e51e6db59e474765cf93268c92b42888", "versionType": "git"}, {"status": "affected", "version": "620c266f394932e5decc4b34683a75dfc59dc2f4", "lessThan": "a8ed2c29fcfdac78db96c9da4e659c8a513f2a94", "versionType": "git"}, {"status": "affected", "version": "620c266f394932e5decc4b34683a75dfc59dc2f4", "lessThan": "40ab6644b99685755f740b872c00ef40d9aa870e", "versionType": "git"}], "programFiles": ["fs/fhandle.c", "fs/mount.h", "fs/namespace.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.11"}, {"status": "unaffected", "version": "0", "lessThan": "6.11", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.95", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.36", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.13", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/fhandle.c", "fs/mount.h", "fs/namespace.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/15ea8dc42a02259d49dee38a658d40f60fcd75ed"}, {"url": "https://git.kernel.org/stable/c/32138633e51e6db59e474765cf93268c92b42888"}, {"url": "https://git.kernel.org/stable/c/a8ed2c29fcfdac78db96c9da4e659c8a513f2a94"}, {"url": "https://git.kernel.org/stable/c/40ab6644b99685755f740b872c00ef40d9aa870e"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh()\n\nmay_decode_fh() accesses mount::mnt_ns without holding any locks; that\nmeans the mount can concurrently be unmounted, and the mnt_namespace can\nconcurrently be freed after an RCU grace period.\n\nThis race can happens as follows, assuming that the mount point was\ncreated by open_tree(..., OPEN_TREE_CLONE):\n\nthread 1 thread 2 RCU\n __do_sys_open_by_handle_at\n do_handle_open\n handle_to_path\n may_decode_fh\n is_mounted\n [mount::mnt_ns access]\n [mount::mnt_ns access]\n__do_sys_close\n fput_close_sync\n __fput\n dissolve_on_fput\n umount_tree\n class_namespace_excl_destructor\n namespace_unlock\n free_mnt_ns\n mnt_ns_tree_remove\n call_rcu(mnt_ns_release_rcu)\n mnt_ns_release_rcu\n mnt_ns_release\n kfree\n [mnt_namespace::user_ns access] **UAF**\n\nFix it by taking rcu_read_lock() around the mount::mnt_ns access, like\nin __prepend_path().\nAdditionally, document the semantics of mount::mnt_ns, and use WRITE_ONCE()\nfor writers that can race with lockless readers.\n\nThis bug is unreachable unless one of the following is set:\n\n - CONFIG_PREEMPTION\n - CONFIG_RCU_STRICT_GRACE_PERIOD\n\nbecause it requires an RCU grace period to happen during a syscall without\nan explicit preemption.\n\nThis doesn't seem to have interesting security impact; worst-case, it could\nleak the result of an integer comparison to userspace (from the level\ncheck in cap_capable()), cause an endless loop, or crash the kernel by\ndereferencing an invalid address."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.95", "versionStartIncluding": "6.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.36", "versionStartIncluding": "6.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.13", "versionStartIncluding": "6.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "6.11"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:35:02.388Z"}}}, "cveMetadata": {"cveId": "CVE-2026-53341", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:07:43.543Z", "dateReserved": "2026-06-09T07:44:35.399Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-01T13:32:22.873Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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that\nmeans the mount can concurrently be unmounted, and the mnt_namespace can\nconcurrently be freed after an RCU grace period.\n\nThis race can happens as follows, assuming that the mount point was\ncreated by open_tree(..., OPEN_TREE_CLONE):\n\nthread 1 thread 2 RCU\n __do_sys_open_by_handle_at\n do_handle_open\n handle_to_path\n may_decode_fh\n is_mounted\n [mount::mnt_ns access]\n [mount::mnt_ns access]\n__do_sys_close\n fput_close_sync\n __fput\n dissolve_on_fput\n umount_tree\n class_namespace_excl_destructor\n namespace_unlock\n free_mnt_ns\n mnt_ns_tree_remove\n call_rcu(mnt_ns_release_rcu)\n mnt_ns_release_rcu\n mnt_ns_release\n kfree\n [mnt_namespace::user_ns access] **UAF**\n\nFix it by taking rcu_read_lock() around the mount::mnt_ns access, like\nin __prepend_path().\nAdditionally, document the semantics of mount::mnt_ns, and use WRITE_ONCE()\nfor writers that can race with lockless readers.\n\nThis bug is unreachable unless one of the following is set:\n\n - CONFIG_PREEMPTION\n - CONFIG_RCU_STRICT_GRACE_PERIOD\n\nbecause it requires an RCU grace period to happen during a syscall without\nan explicit preemption.\n\nThis doesn't seem to have interesting security impact; worst-case, it could\nleak the result of an integer comparison to userspace (from the level\ncheck in cap_capable()), cause an endless loop, or crash the kernel by\ndereferencing an invalid address."}], "id": "CVE-2026-53341", "lastModified": "2026-10-19T20:19:15.133", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53341", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:28:32.016897Z", "version": "2.0.3"}}]}, "published": "2026-07-01T14:16:42.143", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/15ea8dc42a02259d49dee38a658d40f60fcd75ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/32138633e51e6db59e474765cf93268c92b42888"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/40ab6644b99685755f740b872c00ef40d9aa870e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a8ed2c29fcfdac78db96c9da4e659c8a513f2a94"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: fhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh()", "id": "2495938", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2495938"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-364", "details": ["A flaw was found in the Linux kernel. This vulnerability, a Use-After-Free (UAF), occurs in the `fhandle` component when the `may_decode_fh()` function accesses mount namespace information without proper locking. This creates a race condition that could be exploited by an attacker. The most severe consequence is a kernel crash, leading to a Denial of Service (DoS), but it could also result in an endless loop or the disclosure of sensitive information."], "name": "CVE-2026-53341", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53341\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53341\nhttps://lore.kernel.org/linux-cve-announce/2026070144-CVE-2026-53341-64ff@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[620c266f394932e5decc4b34683a75dfc59dc2f4,32138633e51e6db59e474765cf93268c92b42888)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[620c266f394932e5decc4b34683a75dfc59dc2f4,a8ed2c29fcfdac78db96c9da4e659c8a513f2a94)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[620c266f394932e5decc4b34683a75dfc59dc2f4,40ab6644b99685755f740b872c00ef40d9aa870e)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"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": "6.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.36,6.19.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.13,7.1.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-01T17:00:05.911062+00:00", "updated": "2026-08-12T10:00:01.838882+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}