CVE-2026-23410

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However\nduring profile removal there is a window where the vfs and profile\ndestruction race, resulting in the use after free.\n\nFix this by moving to a double refcount scheme. Where the profile\nrefcount on rawdata is used to break the circular dependency. Allowing\nfor freeing of the rawdata once all inode references to the rawdata\nare put."}], "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 vulnerability is in AppArmor's securityfs interface, which is only accessible locally via filesystem operations (open/read on /sys/kernel/security/apparmor/ rawdata files). No network or adjacent attack vector exists.\nAC:L - The attacker controls both sides of the race \u2014 they can open rawdata files and simultaneously remove profiles in their own namespace. The race can be retried indefinitely, making exploitation reliable.\nPR:L - With default unprivileged_userns_apparmor_policy=1, an unprivileged local user can create a user namespace, obtain CAP_MAC_ADMIN within it, load/remove profiles, and trigger the race without real root privileges.\nUI:N - No user interaction is required. The attacker can trigger both sides of the race (opening rawdata files and removing profiles) entirely autonomously.\nS:U - This is a standard kernel privilege escalation within the same security authority (kernel context). No VM escape, IOMMU bypass, or sandbox boundary crossing is involved.\nC:H - The use-after-free allows the attacker to control the contents of the freed aa_loaddata allocation via heap spraying, enabling arbitrary kernel memory reads and information disclosure.\nI:H - The use-after-free enables heap spraying to place attacker-controlled data in the freed allocation, providing arbitrary write primitives and potential code execution in kernel context.\nA:H - The use-after-free causes access to freed memory which reliably triggers kernel crashes (oops/panic), especially since kfree_sensitive zeros the freed memory, causing NULL pointer dereferences on the stale data."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["security/apparmor/apparmorfs.c", "security/apparmor/include/policy_unpack.h", "security/apparmor/policy.c", 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start\nopen()ing one of the rawdata files, and at the same time remove the\nlast reference to this rawdata (by removing the corresponding profile,\nfor example), which frees its struct aa_loaddata; as a result, when\nseq_rawdata_open() is reached, i_private is a dangling pointer and\nfreed memory is accessed.\n\nThe rawdata inodes weren't refcounted to avoid a circular refcount and\nwere supposed to be held by the profile rawdata reference. However\nduring profile removal there is a window where the vfs and profile\ndestruction race, resulting in the use after free.\n\nFix this by moving to a double refcount scheme. Where the profile\nrefcount on rawdata is used to break the circular dependency. Allowing\nfor freeing of the rawdata once all inode references to the rawdata\nare put."}], "id": "CVE-2026-23410", "lastModified": "2026-06-17T10:21:31.740", "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"}, {"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": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-04-01T09:16:17.093", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3b8e77c7abab40e6de9ad9de730d77984a498840"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6b6ba87579c7e7c669e0bec91823e7fb693bc5df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6ef1f2926c41ab96952d9696d55a052f1b3a9418"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/763e838adc3c7ec5a7df2990ce84cad951e42721"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0b7091c4de45a7325c8780e6934a894f92ac86b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/af782cc8871e3683ddd5a3cd2f7df526599863a9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d9d8560b9b7932f8cffc4c068c14289220900f79"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f9761add6d100962a23996cb68f3d6abdd4d1815"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: apparmor: fix race on rawdata dereference", "id": "2453793", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453793"}, "csaw": false, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's AppArmor security module. This vulnerability, a race condition, allows a local attacker to trigger a use-after-free error by simultaneously opening rawdata files and removing an associated AppArmor profile. This can lead to the system accessing freed memory, which may result in privilege escalation or arbitrary code execution."], "name": "CVE-2026-23410", "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"}], "public_date": "2026-04-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23410\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23410\nhttps://lore.kernel.org/linux-cve-announce/2026040113-CVE-2026-23410-d7d5@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5d5182cae40115c03933989473288e54afb39c7c,6ef1f2926c41ab96952d9696d55a052f1b3a9418)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5d5182cae40115c03933989473288e54afb39c7c,f9761add6d100962a23996cb68f3d6abdd4d1815)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5d5182cae40115c03933989473288e54afb39c7c,af782cc8871e3683ddd5a3cd2f7df526599863a9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5d5182cae40115c03933989473288e54afb39c7c,763e838adc3c7ec5a7df2990ce84cad951e42721)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5d5182cae40115c03933989473288e54afb39c7c,a0b7091c4de45a7325c8780e6934a894f92ac86b)"}}], "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": "4.13"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.130,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.77,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.18,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.8,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0-rc4,*]"}}], "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"}], "analysis": {"en": {"generated_at": "2026-04-28T16:51:19.427064+00:00", "value": {"mitigation_remediation": ["Apply the Linux kernel patch that implements the double\u2011refcount scheme for AppArmor rawdata inodes", "If an update is not yet available, avoid concurrently deleting AppArmor profiles while processes may access rawdata files; ensure no open file operations occur during profile removal", "Consider temporarily disabling or restricting AppArmor profile management on systems until the kernel patch is applied"], "summary": {"action": "Immediate Patch", "impact": "Use\u2011after\u2011free in AppArmor rawdata can lead to memory corruption"}, "threat_synthesis": {"affected_systems": "The affected components are the Linux kernel implementations of AppArmor rawdata inodes. All distributions that ship the original Linux kernel AppArmor code are potentially impacted. No specific kernel revisions are enumerated in the advisory, so any kernel containing the unpatched rawdata handling code is at risk.", "description_and_impact": "In the Linux kernel, a race condition in the AppArmor module allows a use\u2011after\u2011free when a user opens a rawdata file while simultaneously removing its corresponding profile. The rawdata inode is not reference\u2011counted, so the kernel can free the associated aa_loaddata structure after the profile is deleted. When seq_rawdata_open later dereferences the i_private pointer, it accesses freed memory, potentially corrupting data or allowing arbitrary code execution. This vulnerability satisfies CWE\u2011911 and CWE\u2011362, indicating data\u2011structure misuse that may compromise confidentiality, integrity, or availability.", "risk_and_exploitability": "The CVSS base score of 7.8 indicates a high severity vulnerability. The EPSS score is below 1\u202f%, suggesting that exploitation is unlikely in the wild, and the vulnerability is not listed in the CISA KEV catalog. Attackers would need local access with the ability to both open a rawdata file and delete its AppArmor profile, such as a privileged user or a compromised process. The race can be triggered by concurrent operations, so the attack vector is likely local. The flaw also maps to CWE\u2011362, a race condition category, underscoring the concurrency issue. If an attacker can cause the kernel to dereference invalid memory, the impact could be significant, leading to potential crashes or privilege escalation."}}}}, "created": "2026-04-02T07:49:33.754565+00:00", "updated": "2026-04-28T17:00:13.436344+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}