{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53341", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.399Z", "datePublished": "2026-07-01T13:32:22.873Z", "dateUpdated": "2026-07-18T07:33:21.019Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-18T07:33:21.019Z"}, "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."}], "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"}}], "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"}}}}

{}

{}

{"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": "2026-07-25T22:30:05.059696+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}