CVE-2025-38173

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(`algif_aead` with `authenc(...,cbc(aes))`) submitting an AAD-only request, or another in-kernel skcipher caller; the network consumers of `cbc(aes)` (IPsec ESP) explicitly reject `elen <= 0`, so no remote peer can drive `cryptlen == 0`.\nAC:L - The attacker directly and fully controls `req->cryptlen` by choosing the sendmsg payload length equal to the assoclen; the condition is deterministic with no race, memory-layout, or timing dependency.\nPR:L - Any unprivileged local user can open an `AF_ALG` socket and bind an `authenc(hmac(sha1),cbc(aes))` transform \u2014 no capabilities, no root, and no namespace tricks are required.\nUI:N - The attacker performs the entire sequence (socket/bind/sendmsg/recvmsg) on their own; no victim action or cooperation is involved.\nS:U - The faulty memory access and the resulting crash/leak are entirely within the kernel's own security authority on the same host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The driver reads memory it never validated for a zero-length request (\"Do not access random memory\"), and on the non-TDMA path returns stale CESA SRAM contents \u2014 leftover IV/crypto state from a previous, potentially different-security-context operation \u2014 straight back into the caller's user-visible IV buffer.\nI:H - The unvalidated zero-length request is still programmed into a DMA-capable crypto engine with a zero-length descriptor and `nents == 0` scatterlists, so the out-of-contract memory access is not read-only and the resulting corrupted state is written back into caller buffers; the higher value is taken given the ambiguity of the \"random memory\" access direction.\nA:H - On the common TDMA-equipped CESA parts, `dma_map_sg()` with `nents == 0` returns 0 and trips `WARN_ON_ONCE()` in `__dma_map_sg_attrs()`, producing a kernel splat that becomes a full panic under `panic_on_warn`, and the zero-length descriptor handed to the engine leaves the hardware in an undefined state."}]}], "affected": 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No acceder a memoria aleatoria para solicitudes skcipher de longitud cero. Simplemente devolver 0."}], "id": "CVE-2025-38173", "lastModified": "2026-07-30T06:22:56.950", "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"}, {"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"}]}, "published": "2025-07-03T09:15:33.050", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/32d3e8049a8b60f18c5c39f5931bfb1130ac11c9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5e9666ac8b94c978690f937d59170c5237bd2c45"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7894694b5d5b2ecfd7fb081d6f60b9e169ab4d13"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/78ea1ff6cb413a03ff6f7af4e28e24b4461a0965"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8a4e047c6cc07676f637608a9dd675349b5de0a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c064ae2881d839709bd72d484d5f2af157f46024"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c9610dda42bd382a96f97e68825cb5f66cd9e1dc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e1cc69da619588b1488689fe3535a0ba75a2b0e7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: crypto: marvell/cesa - Handle zero-length skcipher requests", "id": "2376085", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376085"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncrypto: marvell/cesa - Handle zero-length skcipher requests\nDo not access random memory for zero-length skcipher requests.\nJust return 0."], "name": "CVE-2025-38173", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not 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": "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": "2025-07-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38173\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38173\nhttps://lore.kernel.org/linux-cve-announce/2025070343-CVE-2025-38173-f02e@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-06T22:16:21.705836+00:00", "updated": "2025-07-06T22:16:21.705885+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}