CVE-2026-93147

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93147", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T16:02:15.088Z", "datePublished": "2026-09-17T16:11:44.793Z", "dateUpdated": "2026-10-19T09:06:19.689Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:06:19.689Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/bpf: Replace ly instruction with llgf\n\ncpu_nr is a 32 bit value and BPF_REG_0 is a 64 bit register, when ly loads\nthe cpu_nr into BPF_REG_0 it does not zero the upper bits, but llgf does."}], "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 malformed input is eBPF bytecode containing BPF_JMP|BPF_CALL with imm=BPF_FUNC_get_smp_processor_id, loaded via bpf_prog_load() (bpf(2) BPF_PROG_LOAD). s390 bpf_jit_insn() then inlines that call as LY from get_lowcore()->cpu_nr; no remote protocol carries this bytecode.\nAC:L - The attacker sets BPF_REG_0 (s390 %r14) with BPF_LD_IMM64, then emits the helper call; bpf_jit_insn() always compiles it to LY (E358), which writes only bits 32-63 and leaves the attacker-chosen high half intact. bpf_opt_remove_dead_code() does not delete that store, and there is no race.\nPR:L - bpf_prog_load() allows BPF_PROG_TYPE_SOCKET_FILTER; sk_filter_func_proto() reaches bpf_base_func_proto(), which returns bpf_get_raw_smp_processor_id_proto for BPF_FUNC_get_smp_processor_id before its CAP_BPF gate, and BPF_MAP_TYPE_ARRAY is an unprivileged map. CAP_BPF is also granted by bpf_token_capable() in a delegated user namespace.\nUI:N - The attacker loads the crafted program with bpf(BPF_PROG_LOAD) and executes it themselves via BPF_PROG_TEST_RUN (sk_filter_prog_ops.test_run = bpf_prog_test_run_skb) or SO_ATTACH_BPF on their own socket; no other user must mount, open, or otherwise act.\nS:U - LY leaving stale high bits in BPF_REG_0 lets the JITed program read and write the host kernel through a verifier-approved PTR_TO_MAP_VALUE. That stays inside the same kernel authority; it is not a KVM guest-to-host or IOMMU bypass.\nC:H - do_refine_retval_range() sets R0\u2019s 64-bit range to [0, nr_cpu_ids-1] after BPF_FUNC_get_smp_processor_id, so check_map_access() allows adding it to a map-value pointer. LY preserves attacker high bits, so the subsequent BPF_LDX reads kernel memory far outside the map.\nI:H - The same forged pointer is a BPF_STX destination: the store lands at map_value + ((old_r0 & 0xFFFFFFFF00000000) | cpu_nr). That is an attacker-controlled kernel write usable for corruption and control-flow hijack.\nA:H - Using that out-of-bounds map-value pointer (map_value plus the uncleared high 32 bits of %r14 after LY of cpu_nr) faults on unmapped addresses and oopses or panics the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/s390/net/bpf_jit_comp.c"], "versions": [{"version": "9012cf2491e3c5d28d098b0d6da804af82977032", "lessThan": "88500a86ab79f01c568de6ed00f5b1c5c79f11d5", "status": "affected", "versionType": "git"}, {"version": "9012cf2491e3c5d28d098b0d6da804af82977032", "lessThan": "5f6cc299938b561cb01e343bab7042611fcee12a", "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/s390/net/bpf_jit_comp.c"], "versions": [{"version": "7.2", "status": "affected"}, {"version": "0", "lessThan": "7.2", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "7.2", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.2", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/88500a86ab79f01c568de6ed00f5b1c5c79f11d5"}, {"url": "https://git.kernel.org/stable/c/5f6cc299938b561cb01e343bab7042611fcee12a"}], "title": "s390/bpf: Replace ly instruction with llgf", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/s390/net/bpf_jit_comp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "88500a86ab79f01c568de6ed00f5b1c5c79f11d5", "status": "affected", "version": "9012cf2491e3c5d28d098b0d6da804af82977032", "versionType": "git"}, {"lessThan": "5f6cc299938b561cb01e343bab7042611fcee12a", "status": "affected", "version": "9012cf2491e3c5d28d098b0d6da804af82977032", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/s390/net/bpf_jit_comp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.2"}, {"lessThan": "7.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\ns390/bpf: Replace ly instruction with llgf\n\ncpu_nr is a 32 bit value and BPF_REG_0 is a 64 bit register, when ly loads\nthe cpu_nr into BPF_REG_0 it does not zero the upper bits, but llgf does."}], "id": "CVE-2026-93147", "lastModified": "2026-10-19T10:17:04.833", "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": "2026-09-17T17:18:09.867", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5f6cc299938b561cb01e343bab7042611fcee12a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/88500a86ab79f01c568de6ed00f5b1c5c79f11d5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9012cf2491e3c5d28d098b0d6da804af82977032,88500a86ab79f01c568de6ed00f5b1c5c79f11d5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9012cf2491e3c5d28d098b0d6da804af82977032,5f6cc299938b561cb01e343bab7042611fcee12a)"}}], "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": "7.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*]"}}], "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": "2026-09-19T08:45:06.629781+00:00", "updated": "2026-09-20T04:00:09.668562+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-665"]}