CVE-2026-23411

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However the inode\ncan aand does live beyond that point and it is possible that some of\nthe fs call back functions will be invoked after the reference has\nbeen put, which results in a race between freeing the data and\naccessing it through the fs.\n\nWhile the rawdata/loaddata is the most likely candidate to fail the\nrace, as it has the fewest references. If properly crafted it might be\npossible to trigger a race for the other types stored in i_private.\n\nFix this by moving the put of i_private referenced data to the correct\nplace which is during inode eviction."}], "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 apparmorfs, a local filesystem interface at /sys/kernel/security/apparmor/. Exploitation requires local system access to perform filesystem operations (open, read, mkdir, rmdir).\nAC:L - The attacker controls both sides of the race \u2014 they can concurrently open/read apparmorfs files and remove profiles/namespaces. Per kernel guidance, race conditions where the attacker controls both sides are AC:L.\nPR:L - In container environments with AppArmor namespaces (LXD, some Kubernetes), container root (effectively low-privileged from host perspective) has matching AA namespace levels and can manage AppArmor policy within its namespace with default unprivileged_userns_apparmor_policy=1.\nUI:N - No user interaction is needed. The attacker triggers both the file access and the profile/namespace removal concurrently without requiring any victim action.\nS:U - This is a standard kernel privilege escalation via use-after-free in the AppArmor subsystem. The vulnerability and impact are within the same security authority (kernel space).\nC:H - The use-after-free gives the attacker control over freed object contents through heap spraying, enabling arbitrary kernel memory reads.\nI:H - The use-after-free enables heap spraying to control freed objects, providing arbitrary write primitives and potential control flow hijacking for kernel code execution.\nA:H - The use-after-free causes kernel crashes (accessing freed/corrupted memory leads to oops or panic) even without full exploitation."}]}], "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/label.h", "security/apparmor/include/lib.h", "security/apparmor/include/policy.h", "security/apparmor/include/policy_unpack.h", "security/apparmor/label.c", "security/apparmor/policy_unpack.c"], "versions": 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following vulnerability has been resolved:\n\napparmor: fix race between freeing data and fs accessing it\n\nAppArmor was putting the reference to i_private data on its end after\nremoving the original entry from the file system. However the inode\ncan aand does live beyond that point and it is possible that some of\nthe fs call back functions will be invoked after the reference has\nbeen put, which results in a race between freeing the data and\naccessing it through the fs.\n\nWhile the rawdata/loaddata is the most likely candidate to fail the\nrace, as it has the fewest references. If properly crafted it might be\npossible to trigger a race for the other types stored in i_private.\n\nFix this by moving the put of i_private referenced data to the correct\nplace which is during inode eviction."}], "id": "CVE-2026-23411", "lastModified": "2026-06-17T10:21:31.873", "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": "2026-04-01T09:16:17.270", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/13bc2772414d68e94e273dea013181a986948ddf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2a732ed26fbd048e7925d227af8cf9ea43fb5cc9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3ddb961d2929bbb3204a2bba21b5d8153cd3f7cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/667df93769c02ff581c77d2d8f162147e719c557"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8e135b8aee5a06c52a4347a5a6d51223c6f36ba3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a92c5e5086a87d082696245a8607666da3d80554"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ae10787d955fb255d381e0d5589451dd72c614b1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eecce026399917f6efa532c56bc7a3e9dd6ee68b"}], "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 between freeing data and fs accessing it", "id": "2453789", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453789"}, "csaw": false, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's AppArmor security module. A race condition occurs when AppArmor incorrectly manages the lifecycle of `i_private` data, leading to situations where data is freed while still being accessed by file system callback functions. This timing vulnerability can result in memory corruption. A local attacker could potentially exploit this flaw to cause a denial of service or, with further exploitation, achieve more severe impacts."], "name": "CVE-2026-23411", "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-2026-23411\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23411\nhttps://lore.kernel.org/linux-cve-announce/2026040114-CVE-2026-23411-00f7@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c961ee5f21b202dea60b63eeef945730d92e46a6,ae10787d955fb255d381e0d5589451dd72c614b1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c961ee5f21b202dea60b63eeef945730d92e46a6,eecce026399917f6efa532c56bc7a3e9dd6ee68b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c961ee5f21b202dea60b63eeef945730d92e46a6,2a732ed26fbd048e7925d227af8cf9ea43fb5cc9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c961ee5f21b202dea60b63eeef945730d92e46a6,8e135b8aee5a06c52a4347a5a6d51223c6f36ba3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c961ee5f21b202dea60b63eeef945730d92e46a6,13bc2772414d68e94e273dea013181a986948ddf)"}}], "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": "2026-04-28T16:51:00.129603+00:00", "value": {"mitigation_remediation": ["Update the Linux kernel to a version that includes the AppArmor race fix", "If a kernel update is not immediately available, consider disabling AppArmor or removing relevant AppArmor profiles to eliminate the vulnerable code path", "Verify that the operating system\u2019s kernel address space layout randomization and other memory protection mitigations are enabled to reduce the likelihood of a successful exploitation attempt"], "summary": {"action": "Apply Patch", "impact": "Use\u2011after\u2011free in the kernel can trigger crashes or memory corruption leading to denial of service and potential privilege escalation"}, "threat_synthesis": {"affected_systems": "All Linux kernel releases prior to the applied security fix are affected. The vulnerability is present in standard Linux distributions and any custom kernels that include the flawed AppArmor code paths. Specific affected kernel versions are not listed, so any kernel before the upstream patch should be considered vulnerable.", "description_and_impact": "A race condition exists in the AppArmor subsystem of the Linux kernel where a reference to inode private data is cleared before related filesystem callbacks execute. The freed data may be accessed by these callbacks, causing the kernel to read or write freed memory. If an attacker can orchestrate the timing of these operations, the race can lead to a kernel panic, denial of service, or, in the worst case, a privilege\u2011escalation scenario through memory corruption.", "risk_and_exploitability": "The vulnerability scores a CVSS of 7.8, indicating high severity. EPSS is below 1%, suggesting a low probability of exploitation in the wild. It is not included in the CISA KEV catalog, further indicating limited active exploitation. The likely attack vector involves manipulating AppArmor policies or privileged system calls to trigger the race; however, the exact prerequisites are not detailed in the advisory and are inferred from the nature of the race condition."}}}}, "created": "2026-04-02T07:49:32.687960+00:00", "updated": "2026-04-28T17:00:13.432898+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}