CVE-2026-45903

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-45903", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.084Z", "datePublished": "2026-05-27T12:17:11.382Z", "dateUpdated": "2026-05-27T12:17:11.382Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-27T12:17:11.382Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix memory access flags in helper prototypes\n\nAfter commit 37cce22dbd51 (\"bpf: verifier: Refactor helper access type tracking\"),\nthe verifier started relying on the access type flags in helper\nfunction prototypes to perform memory access optimizations.\n\nCurrently, several helper functions utilizing ARG_PTR_TO_MEM lack the\ncorresponding MEM_RDONLY or MEM_WRITE flags. This omission causes the\nverifier to incorrectly assume that the buffer contents are unchanged\nacross the helper call. Consequently, the verifier may optimize away\nsubsequent reads based on this wrong assumption, leading to correctness\nissues.\n\nFor bpf_get_stack_proto_raw_tp, the original MEM_RDONLY was incorrect\nsince the helper writes to the buffer. Change it to ARG_PTR_TO_UNINIT_MEM\nwhich correctly indicates write access to potentially uninitialized memory.\n\nSimilar issues were recently addressed for specific helpers in commit\nac44dcc788b9 (\"bpf: Fix verifier assumptions of bpf_d_path's output buffer\")\nand commit 2eb7648558a7 (\"bpf: Specify access type of bpf_sysctl_get_name args\").\n\nFix these prototypes by adding the correct memory access flags."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/helpers.c", "kernel/bpf/syscall.c", "kernel/trace/bpf_trace.c", "net/core/filter.c"], "versions": [{"version": "37cce22dbd51a3ef7f6c08c3fb5f1c5075a17fbb", "lessThan": "fdfe75161f6e8c41a7d3023fbb815b537107b806", "status": "affected", "versionType": "git"}, {"version": "37cce22dbd51a3ef7f6c08c3fb5f1c5075a17fbb", "lessThan": "aa319592892068bd960c1a1c07bd621085b0c63d", "status": "affected", "versionType": "git"}, {"version": "37cce22dbd51a3ef7f6c08c3fb5f1c5075a17fbb", "lessThan": "802eef5afb1865bc5536a5302c068ba2215a1f72", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/helpers.c", "kernel/bpf/syscall.c", "kernel/trace/bpf_trace.c", "net/core/filter.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.14", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.4", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.14", "versionEndExcluding": "6.18.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.19.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/fdfe75161f6e8c41a7d3023fbb815b537107b806"}, {"url": "https://git.kernel.org/stable/c/aa319592892068bd960c1a1c07bd621085b0c63d"}, {"url": "https://git.kernel.org/stable/c/802eef5afb1865bc5536a5302c068ba2215a1f72"}], "title": "bpf: Fix memory access flags in helper prototypes", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/bpf/helpers.c", "kernel/bpf/syscall.c", "kernel/trace/bpf_trace.c", "net/core/filter.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "fdfe75161f6e8c41a7d3023fbb815b537107b806", "status": "affected", "version": "37cce22dbd51a3ef7f6c08c3fb5f1c5075a17fbb", "versionType": "git"}, {"lessThan": "aa319592892068bd960c1a1c07bd621085b0c63d", "status": "affected", "version": "37cce22dbd51a3ef7f6c08c3fb5f1c5075a17fbb", "versionType": "git"}, {"lessThan": "802eef5afb1865bc5536a5302c068ba2215a1f72", "status": "affected", "version": "37cce22dbd51a3ef7f6c08c3fb5f1c5075a17fbb", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/bpf/helpers.c", "kernel/bpf/syscall.c", "kernel/trace/bpf_trace.c", "net/core/filter.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.14", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C969BF0A-760D-435A-9705-6ED20216C1BB", "versionEndExcluding": "6.18.14", "versionStartIncluding": "6.14", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "672A3E79-EC03-479D-8503-361DFBDC8092", "versionEndExcluding": "6.19.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix memory access flags in helper prototypes\n\nAfter commit 37cce22dbd51 (\"bpf: verifier: Refactor helper access type tracking\"),\nthe verifier started relying on the access type flags in helper\nfunction prototypes to perform memory access optimizations.\n\nCurrently, several helper functions utilizing ARG_PTR_TO_MEM lack the\ncorresponding MEM_RDONLY or MEM_WRITE flags. This omission causes the\nverifier to incorrectly assume that the buffer contents are unchanged\nacross the helper call. Consequently, the verifier may optimize away\nsubsequent reads based on this wrong assumption, leading to correctness\nissues.\n\nFor bpf_get_stack_proto_raw_tp, the original MEM_RDONLY was incorrect\nsince the helper writes to the buffer. Change it to ARG_PTR_TO_UNINIT_MEM\nwhich correctly indicates write access to potentially uninitialized memory.\n\nSimilar issues were recently addressed for specific helpers in commit\nac44dcc788b9 (\"bpf: Fix verifier assumptions of bpf_d_path's output buffer\")\nand commit 2eb7648558a7 (\"bpf: Specify access type of bpf_sysctl_get_name args\").\n\nFix these prototypes by adding the correct memory access flags."}], "id": "CVE-2026-45903", "lastModified": "2026-06-24T16:28:55.553", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-27T14:17:04.710", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/802eef5afb1865bc5536a5302c068ba2215a1f72"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aa319592892068bd960c1a1c07bd621085b0c63d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fdfe75161f6e8c41a7d3023fbb815b537107b806"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: bpf: Fix memory access flags in helper prototypes", "id": "2482125", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482125"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-733", "details": ["A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) verifier. This vulnerability occurs because several BPF helper functions lack proper memory access flags, such as MEM_RDONLY or MEM_WRITE. Consequently, the verifier may incorrectly assume that buffer contents remain unchanged across helper calls, leading to incorrect optimizations. This can result in data integrity issues within the kernel, potentially affecting system stability and reliability."], "name": "CVE-2026-45903", "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": "Under investigation", "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": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-45903\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-45903\nhttps://lore.kernel.org/linux-cve-announce/2026052720-CVE-2026-45903-dac2@gregkh/T"], "statement": "The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space.\nFor the Red Hat Enterprise Linux 9 to confirm the current state, inspect the sysctl with the command:\ncat /proc/sys/kernel/unprivileged_bpf_disabled\nThe setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[37cce22dbd51a3ef7f6c08c3fb5f1c5075a17fbb,fdfe75161f6e8c41a7d3023fbb815b537107b806)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[37cce22dbd51a3ef7f6c08c3fb5f1c5075a17fbb,aa319592892068bd960c1a1c07bd621085b0c63d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[37cce22dbd51a3ef7f6c08c3fb5f1c5075a17fbb,802eef5afb1865bc5536a5302c068ba2215a1f72)"}}], "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": "6.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.14,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.4,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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": "2026-05-27T18:15:21.213017+00:00", "updated": "2026-08-12T03:15:04.794285+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}