{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72111", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.906Z", "datePublished": "2026-08-15T05:52:52.538Z", "dateUpdated": "2026-08-17T05:40:25.647Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:40:25.647Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reset register bounds before narrowing retval range in check_mem_access()\n\nWhen the BPF verifier processes a context load of an LSM hook return\nvalue, it calls __mark_reg_s32_range() to narrow the register to the\nhook's valid range. However, __mark_reg_s32_range() intersects the new\nrange with the register's existing bounds using max_t()/min_t() rather\nthan replacing them.\n\nIf the destination register carries stale bounds from a prior instruction\n(e.g. BPF_MOV64_IMM), the intersection can produce a range narrower than\nreality. The verifier then believes it knows the register's exact value,\nwhile at runtime the actual hook return value is loaded, creating a\nverifier/runtime mismatch that can be used to bypass BPF memory safety\nchecks.\n\nThe else branch already calls mark_reg_unknown() to reset register state\nbefore any narrowing. Apply the same reset in the is_retval path so\nstale bounds are cleared before __mark_reg_s32_range() intersects."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The flaw is reached only through bpf(BPF_PROG_LOAD) during bpf_check()->check_mem_access() when a BPF_LSM_MAC program loads the LSM hook return value from PTR_TO_CTX; per kernel CNA guidance BPF verifier issues are Local even if attached programs later run on file, socket, or network LSM hooks.\nAC:L - An attacker fully controls the BPF instruction sequence (e.g., BPF_MOV64_IMM to leave stale bounds, then a ctx retval load) and can deterministically force __mark_reg_s32_range() to intersect into an overly narrow range without races, special memory layout, or other uncontrollable conditions.\nPR:L - Loading BPF_PROG_TYPE_LSM programs requires CAP_BPF and CAP_PERFMON (is_perfmon_prog_type), both blocked for unprivileged users when kernel.unprivileged_bpf_disabled is set but obtainable inside user namespaces on typical CONFIG_BPF_LSM systems per kernel CNA BPF guidance.\nUI:N - No victim interaction is required; the attacker loads, verifies, and attaches their own malicious BPF LSM program and triggers the attached LSM hook with their own local syscalls or network operations.\nS:C - A container or user-namespace tenant with namespace-granted CAP_BPF can load a verifier-bypassing BPF LSM program whose runtime memory corruption executes in host kernel context on LSM hook firing, crossing the container-to-host security boundary on multi-tenant cloud and Android-style deployments.\nC:H - The verifier/runtime register-bounds mismatch lets unsafe BPF programs pass verification and perform out-of-bounds reads on ctx, stack, or map memory at runtime, a memory-corruption primitive that can be developed into arbitrary kernel memory disclosure.\nI:H - False exact-knowledge of the LSM return-value register enables verifier-approved pointer arithmetic and memory writes that are invalid at runtime, enabling out-of-bounds writes and control-flow hijacking toward arbitrary kernel code execution from BPF context.\nA:H - Running verifier-incorrect BPF LSM programs can trigger kernel oops or panic from corrupted memory accesses, and once attached the attacker can repeatedly invoke the hook to cause repeatable host-wide denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/verifier.c"], "versions": [{"version": "5d99e198be279045e6ecefe220f5c52f8ce9bfd5", "lessThan": "bde92f65042ec14389782dd223f706bf6b59ce5d", "status": "affected", "versionType": "git"}, {"version": "5d99e198be279045e6ecefe220f5c52f8ce9bfd5", "lessThan": "0993dc5fc619c0b25ab1310cb11d65e78351c0fe", "status": "affected", "versionType": "git"}, {"version": "5d99e198be279045e6ecefe220f5c52f8ce9bfd5", "lessThan": "5a55f9aecc08990940e70f0c7048a80850c5a16a", "status": "affected", "versionType": "git"}, {"version": "5d99e198be279045e6ecefe220f5c52f8ce9bfd5", "lessThan": "5e0b273e0a62cc04ec338c7b502797c66c2ed42a", "status": "affected", "versionType": "git"}, {"version": "1050727d83e70449991c29dd1cf29fe936a63da3", "status": "affected", "versionType": "git"}, {"version": "27ca3e20fe80be85a92b10064dfeb56cb2564b1c", "status": "affected", "versionType": "git"}, {"version": "6.10.13", "lessThan": "6.11", "status": "affected", "versionType": "semver"}, {"version": "6.11.2", "lessThan": "6.12", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/verifier.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.12", "versionEndExcluding": "6.12.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/bde92f65042ec14389782dd223f706bf6b59ce5d"}, {"url": "https://git.kernel.org/stable/c/0993dc5fc619c0b25ab1310cb11d65e78351c0fe"}, {"url": "https://git.kernel.org/stable/c/5a55f9aecc08990940e70f0c7048a80850c5a16a"}, {"url": "https://git.kernel.org/stable/c/5e0b273e0a62cc04ec338c7b502797c66c2ed42a"}], "title": "bpf: Reset register bounds before narrowing retval range in check_mem_access()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/bpf/verifier.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "bde92f65042ec14389782dd223f706bf6b59ce5d", "status": "affected", "version": "5d99e198be279045e6ecefe220f5c52f8ce9bfd5", "versionType": "git"}, {"lessThan": "0993dc5fc619c0b25ab1310cb11d65e78351c0fe", "status": "affected", "version": "5d99e198be279045e6ecefe220f5c52f8ce9bfd5", "versionType": "git"}, {"lessThan": "5a55f9aecc08990940e70f0c7048a80850c5a16a", "status": "affected", "version": "5d99e198be279045e6ecefe220f5c52f8ce9bfd5", "versionType": "git"}, {"lessThan": "5e0b273e0a62cc04ec338c7b502797c66c2ed42a", "status": "affected", "version": "5d99e198be279045e6ecefe220f5c52f8ce9bfd5", "versionType": "git"}, {"status": "affected", "version": "1050727d83e70449991c29dd1cf29fe936a63da3", "versionType": "git"}, {"status": "affected", "version": "27ca3e20fe80be85a92b10064dfeb56cb2564b1c", "versionType": "git"}, {"lessThan": "6.11", "status": "affected", "version": "6.10.13", "versionType": "semver"}, {"lessThan": "6.12", "status": "affected", "version": "6.11.2", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/bpf/verifier.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.12"}, {"lessThan": "6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.103", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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\nbpf: Reset register bounds before narrowing retval range in check_mem_access()\n\nWhen the BPF verifier processes a context load of an LSM hook return\nvalue, it calls __mark_reg_s32_range() to narrow the register to the\nhook's valid range. However, __mark_reg_s32_range() intersects the new\nrange with the register's existing bounds using max_t()/min_t() rather\nthan replacing them.\n\nIf the destination register carries stale bounds from a prior instruction\n(e.g. BPF_MOV64_IMM), the intersection can produce a range narrower than\nreality. The verifier then believes it knows the register's exact value,\nwhile at runtime the actual hook return value is loaded, creating a\nverifier/runtime mismatch that can be used to bypass BPF memory safety\nchecks.\n\nThe else branch already calls mark_reg_unknown() to reset register state\nbefore any narrowing. Apply the same reset in the is_retval path so\nstale bounds are cleared before __mark_reg_s32_range() intersects."}], "id": "CVE-2026-72111", "lastModified": "2026-08-17T06:18:10.280", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:21:25.447", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0993dc5fc619c0b25ab1310cb11d65e78351c0fe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5a55f9aecc08990940e70f0c7048a80850c5a16a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5e0b273e0a62cc04ec338c7b502797c66c2ed42a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bde92f65042ec14389782dd223f706bf6b59ce5d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: bpf: Reset register bounds before narrowing retval range in check_mem_access()", "id": "2516473", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516473"}, "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-367", "details": ["A flaw was found in the Linux kernel's BPF verifier. When processing a context load of an LSM hook return value, the `__mark_reg_s32_range()` function incorrectly intersects new register bounds with stale ones, rather than replacing them. This can lead to a mismatch between the verifier's understanding of register values and the actual runtime values. An attacker could potentially leverage this verifier/runtime mismatch to bypass BPF memory safety checks."], "name": "CVE-2026-72111", "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": "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": "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": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72111\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72111\nhttps://lore.kernel.org/linux-cve-announce/2026081526-CVE-2026-72111-d7d0@gregkh/T"], "threat_severity": "Moderate"}