CVE-2026-23417

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The\nblinding switch only matches BPF_ST|BPF_MEM (mode 0x60), not\nBPF_ST|BPF_PROBE_MEM32 (mode 0xa0). The instruction falls through\nunblinded.\n\nAdd BPF_ST|BPF_PROBE_MEM32 cases to bpf_jit_blind_insn() alongside the\nexisting BPF_ST|BPF_MEM cases. The blinding transformation is identical:\nload the blinded immediate into BPF_REG_AX via mov+xor, then convert\nthe immediate store to a register store (BPF_STX).\n\nThe rewritten STX instruction must preserve the BPF_PROBE_MEM32 mode so\nthe architecture JIT emits the correct arena addressing (R12-based on\nx86-64). Cannot use the BPF_STX_MEM() macro here because it hardcodes\nBPF_MEM mode; construct the instruction directly instead."}], "id": "CVE-2026-23417", "lastModified": "2026-11-05T22:18:25.323", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23417", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:30:20.590529Z", "version": "2.0.3"}}]}, "published": "2026-04-02T12:16:21.097", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2321a9596d2260310267622e0ad8fbfa6f95378f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/56af722756ed82fee2ae5d5b4d04743407506195"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ccbf29b28b5554f9d65b2fb53b994673ad58b3bf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/de641ea08f8fff6906e169d2576c2ac54e562fbb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: bpf: Fix constant blinding for PROBE_MEM32 stores", "id": "2454315", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454315"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-807", "details": ["A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) component. This vulnerability occurs because the BPF_ST | BPF_PROBE_MEM32 immediate stores are not correctly handled by the constant blinding mechanism. As a result, user-controlled 32-bit immediate values can remain unblinded in JIT-compiled native code, potentially allowing an attacker to bypass security hardening measures."], "name": "CVE-2026-23417", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23417\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23417\nhttps://lore.kernel.org/linux-cve-announce/2026040204-CVE-2026-23417-d6a2@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6082b6c328b5486da2b356eae94b8b83c98b5565,56af722756ed82fee2ae5d5b4d04743407506195)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6082b6c328b5486da2b356eae94b8b83c98b5565,ccbf29b28b5554f9d65b2fb53b994673ad58b3bf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6082b6c328b5486da2b356eae94b8b83c98b5565,de641ea08f8fff6906e169d2576c2ac54e562fbb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6082b6c328b5486da2b356eae94b8b83c98b5565,2321a9596d2260310267622e0ad8fbfa6f95378f)"}}], "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": "6.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.80,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.21,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.11,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0-rc5,*]"}}], "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": "2026-04-28T16:49:26.777132+00:00", "value": {"mitigation_remediation": ["Apply a Linux kernel update that contains the CVE-2026-23417 fix", "If a patch is not yet available, set the kernel parameter bpf_jit_harden=0 to disable the hardening feature", "As an alternative, disable the BPF JIT compiler entirely if a patched kernel is not feasible"], "summary": {"action": "Patch Now", "impact": "Kernel memory corruption via BPF JIT"}, "threat_synthesis": {"affected_systems": "The vulnerability applies to Linux kernel binaries that include the BPF JIT implementation with bpf_jit_harden set to 1 or higher and that have not yet incorporated the patch that adds blinding support for the PROBE_MEM32 store case. Because the input does not list specific kernel release numbers, any kernel version containing the unblinded store path before the fix is considered potentially affected.", "description_and_impact": "The Linux kernel\u2019s eBPF JIT compiler does not blind 32-bit immediate values written with the PROBE_MEM32 variant when the hardening flag bpf_jit_harden is enabled. This oversight allows a malicious eBPF program to leave a 32-bit immediate value unblinded and write it directly to an arbitrary kernel memory address, resulting in kernel memory corruption.", "risk_and_exploitability": "With a CVSS score of 5.5, the severity of this flaw is moderate. The EPSS score of less than 1% indicates a low probability of exploitation in the wild, and the vulnerability is not catalogued in the CISA KEV list. The likely attack vector is the execution of a crafted eBPF program that uses the unblinded PROBE_MEM32 store instruction; no confirmed exploits are reported, but kernel memory corruption could compromise system integrity."}}}}, "created": "2026-04-02T20:12:47.215864+00:00", "updated": "2026-04-28T17:00:13.418444+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}