CVE-2026-68295

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68295", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.380Z", "datePublished": "2026-08-10T12:02:28.412Z", "dateUpdated": "2026-10-21T12:43:47.769Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:43:47.769Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: BPF: Zero-extend signed ALU32 div/mod results\n\nALU32 operations write a 32-bit result and leave the upper 32 bits of\nthe BPF register zero. The LoongArch JIT sign-extends the result of\nsigned ALU32 BPF_DIV and BPF_MOD (off=1), so a negative 32-bit quotient\nor remainder leaves bits 63:32 set in JITted code while the verifier\nand interpreter model those bits as zero.\n\nKeep sign-extension on the operands, which signed divide needs, and\nzero-extend the ALU32 result after the divide or modulo instruction,\nmatching the unsigned ALU32 div/mod paths and every other ALU32\noperation in this JIT."}], "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 flaw is in the LoongArch eBPF JIT and is reached by loading a BPF program via the bpf(BPF_PROG_LOAD) syscall, which requires local access to the system. No network-facing path emits JITted signed ALU32 div/mod on behalf of a remote peer.\nAC:L - The attacker fully controls the BPF instruction sequence and the divisor/dividend, so producing a negative signed ALU32 quotient or remainder is deterministic and repeatable with no race, timing, or memory-layout dependency.\nPR:L - Loading an eBPF program requires only an unprivileged local user where unprivileged BPF is permitted, or CAP_BPF/CAP_SYS_ADMIN which is reachable via user namespaces on many deployments; no real root in the init namespace is needed.\nUI:N - The attacker loads and runs its own BPF program; no action by any other user or administrator is required at any point.\nS:U - The verifier bypass and resulting memory corruption stay within the kernel's own security authority on the same host, giving kernel-level privilege escalation rather than crossing a VM, IOMMU, or hypervisor boundary.\nC:H - The verifier models bits 63:32 of the ALU32 result as zero while the JIT leaves them set, so a later ALU64 shift lets the verifier conclude a register is constant zero when it is really 0xFFFFFFFF; using it as a pointer offset yields an attacker-controlled out-of-bounds read of arbitrary kernel memory.\nI:H - The same verifier/JIT range mismatch produces an out-of-bounds pointer that passes verification for stores as well as loads, giving an arbitrary kernel write primitive usable for control-flow hijacking and full privilege escalation.\nA:H - Out-of-bounds accesses through the mis-tracked register readily fault on unmapped or protected kernel addresses, causing an oops or panic, and the corruption can be repeated at will to bring the system down."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/loongarch/net/bpf_jit.c"], "versions": [{"version": "2425c9e002d2a1fdca34261b2fa6713eafef2163", "lessThan": "7577cca85f2d4590c9d9423ba72ef54181a713c9", "status": "affected", "versionType": "git"}, {"version": "2425c9e002d2a1fdca34261b2fa6713eafef2163", "lessThan": "16656c3d734693be3d8a36dbf9d09142b69f3ddc", "status": "affected", "versionType": "git"}, {"version": "2425c9e002d2a1fdca34261b2fa6713eafef2163", "lessThan": "716cb29dbed4d62e9e108950a1a82bcba4cc2d45", "status": "affected", "versionType": "git"}, {"version": "2425c9e002d2a1fdca34261b2fa6713eafef2163", "lessThan": "dacd348b8a993373576fe2ee2d8b114740ba57a6", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/loongarch/net/bpf_jit.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "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": "6.7", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7577cca85f2d4590c9d9423ba72ef54181a713c9"}, {"url": "https://git.kernel.org/stable/c/16656c3d734693be3d8a36dbf9d09142b69f3ddc"}, {"url": "https://git.kernel.org/stable/c/716cb29dbed4d62e9e108950a1a82bcba4cc2d45"}, {"url": "https://git.kernel.org/stable/c/dacd348b8a993373576fe2ee2d8b114740ba57a6"}], "title": "LoongArch: BPF: Zero-extend signed ALU32 div/mod results", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/loongarch/net/bpf_jit.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "7577cca85f2d4590c9d9423ba72ef54181a713c9", "status": "affected", "version": "2425c9e002d2a1fdca34261b2fa6713eafef2163", "versionType": "git"}, {"lessThan": "16656c3d734693be3d8a36dbf9d09142b69f3ddc", "status": "affected", "version": "2425c9e002d2a1fdca34261b2fa6713eafef2163", "versionType": "git"}, {"lessThan": "716cb29dbed4d62e9e108950a1a82bcba4cc2d45", "status": "affected", "version": "2425c9e002d2a1fdca34261b2fa6713eafef2163", "versionType": "git"}, {"lessThan": "dacd348b8a993373576fe2ee2d8b114740ba57a6", "status": "affected", "version": "2425c9e002d2a1fdca34261b2fa6713eafef2163", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/loongarch/net/bpf_jit.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.7"}, {"lessThan": "6.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "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\nLoongArch: BPF: Zero-extend signed ALU32 div/mod results\n\nALU32 operations write a 32-bit result and leave the upper 32 bits of\nthe BPF register zero. The LoongArch JIT sign-extends the result of\nsigned ALU32 BPF_DIV and BPF_MOD (off=1), so a negative 32-bit quotient\nor remainder leaves bits 63:32 set in JITted code while the verifier\nand interpreter model those bits as zero.\n\nKeep sign-extension on the operands, which signed divide needs, and\nzero-extend the ALU32 result after the divide or modulo instruction,\nmatching the unsigned ALU32 div/mod paths and every other ALU32\noperation in this JIT."}], "id": "CVE-2026-68295", "lastModified": "2026-10-21T13:19:27.540", "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"}]}, "published": "2026-08-10T13:20:18.940", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/16656c3d734693be3d8a36dbf9d09142b69f3ddc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/716cb29dbed4d62e9e108950a1a82bcba4cc2d45"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7577cca85f2d4590c9d9423ba72ef54181a713c9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dacd348b8a993373576fe2ee2d8b114740ba57a6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: LoongArch BPF JIT incorrect sign-extension in ALU32 operations", "id": "2513391", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513391"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-681", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nLoongArch: BPF: Zero-extend signed ALU32 div/mod results\nALU32 operations write a 32-bit result and leave the upper 32 bits of\nthe BPF register zero. The LoongArch JIT sign-extends the result of\nsigned ALU32 BPF_DIV and BPF_MOD (off=1), so a negative 32-bit quotient\nor remainder leaves bits 63:32 set in JITted code while the verifier\nand interpreter model those bits as zero.\nKeep sign-extension on the operands, which signed divide needs, and\nzero-extend the ALU32 result after the divide or modulo instruction,\nmatching the unsigned ALU32 div/mod paths and every other ALU32\noperation in this JIT.", "A flaw was found in the Linux kernel. The LoongArch Just-In-Time (JIT) compiler for the Berkeley Packet Filter (BPF) subsystem incorrectly sign-extends the results of signed 32-bit division and modulo operations. This behavior causes the upper bits of BPF registers to be set, which differs from the expected zero-extension model used by the BPF verifier and interpreter. Such an inconsistency could lead to unexpected program behavior or incorrect data processing within BPF programs."], "name": "CVE-2026-68295", "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": "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"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T12:02:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68295\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68295\nhttps://git.kernel.org/stable/c/716cb29dbed4d62e9e108950a1a82bcba4cc2d45\nhttps://git.kernel.org/stable/c/dacd348b8a993373576fe2ee2d8b114740ba57a6"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2425c9e002d2a1fdca34261b2fa6713eafef2163,716cb29dbed4d62e9e108950a1a82bcba4cc2d45)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2425c9e002d2a1fdca34261b2fa6713eafef2163,dacd348b8a993373576fe2ee2d8b114740ba57a6)"}}], "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": "6.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.6,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-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"}], "created": "2026-08-10T15:30:05.872017+00:00", "updated": "2026-08-14T00:30:03.788984+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}