CVE-2023-52606

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The size of those operations however is\ndetermined separately in analyse_instr().\n\nAdd a check to validate the assumption on the maximum size of the\noperations, so as to prevent any unintended kernel stack corruption."}], "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 vulnerable FP/VMX emulation runs in the local alignment-exception path (alignment_exception \u2192 fix_alignment \u2192 emulate_loadstore), triggered by executing unaligned FP/Altivec instructions on PowerPC; it is not reachable via network packet processing.\nAC:L - An unprivileged attacker can reliably force the emulation path by executing crafted unaligned FP/VMX load/store instructions; no race or attacker-uncontrollable victim state is required.\nPR:L - Any unprivileged local user can trigger alignment exceptions in their own process; no capabilities or root privileges are needed to reach fix_alignment and the vulnerable helpers.\nUI:N - Exploitation requires only the attacker\u2019s own process executing the crafted instructions; no action by another user is needed.\nS:U - Impact is confined to the host kernel authority (local privilege escalation / kernel memory corruption); KVM uses a separate emulate_loadstore path and this is not a guest-to-host escape.\nC:H - On the store paths, an oversized size causes copy_mem_out to read past the stack buffer and write kernel stack contents to attacker-controlled userspace, enabling arbitrary kernel memory disclosure; policy treats such memory corruption as C:H.\nI:H - On the load paths, copy_mem_in writes attacker-controlled userspace data past the fixed stack buffers, enabling kernel stack corruption and control-flow hijacking; buffer overflows of this class are scored I:H.\nA:H - Kernel stack corruption from the oversized copy can oops/panic the kernel; any such crash is scored A:H."}]}], 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{"affected_release": [{"advisory": "RHSA-2024:3618", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.5.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-06-05T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2025:8796", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "kernel-0:5.14.0-427.72.1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-06-11T00:00:00Z"}], "bugzilla": {"description": "kernel: powerpc/lib: Validate size for vector operations", "id": "2268293", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2268293"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-121", "details": ["In the Linux kernel, the following vulnerability has been resolved:\npowerpc/lib: Validate size for vector operations\nSome of the fp/vmx code in sstep.c assume a certain maximum size for the\ninstructions being emulated. The size of those operations however is\ndetermined separately in analyse_instr().\nAdd a check to validate the assumption on the maximum size of the\noperations, so as to prevent any unintended kernel stack corruption.", "A potential stack corruption flaw was found in arch/powerpc/lib/sstep.c in the Linux kernel. This may lead to compromised Confidentiality, Integrity, or Availability."], "name": "CVE-2023-52606", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-03-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52606\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52606\nhttps://lore.kernel.org/linux-cve-announce/2024030647-CVE-2023-52606-fdcc@gregkh/T"], "threat_severity": "Moderate"}

{}