CVE-2026-43125

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When it exceeds DLM_RESNAME_MAXLEN, it can\ncause out-of-bounds write in dlm_search_rsb_tree().\n\nAdd length validation to prevent potential buffer overflow."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable path is reached by DLM recovery messages received over the kernel DLM TCP/SCTP lowcomms transport from a remote cluster peer. Although the peer address must match configured cluster membership, the bug is triggered by network protocol data delivered to the target kernel.\nAC:L - A remote peer that can send DLM recovery traffic controls the malformed RCOM_LOOKUP packet, including the special debug rc_id and oversized length/name payload. The recovery-state gate is a normal DLM condition that a participating peer can plausibly induce or target, so exploitation does not depend on conditions outside attacker control.\nPR:N - The vulnerable receive path does not require credentials or privileges on the target system before parsing the packet. Cluster peer/source-address admission is not a privilege on the vulnerable host, and there is no DLM authentication check before the oversized name reaches the copy.\nUI:N - No victim user action is required once the target DLM lockspace is active and receiving cluster traffic. The attacker sends the malformed recovery message directly.\nS:U - The impact is compromise or crash of the target kernel within the same security authority. This is not a VM escape, IOMMU bypass, or other cross-scope boundary.\nC:H - The bug is a network-controlled stack buffer overflow in the kernel, copying up to socket-buffer-sized attacker data into a 64-byte resource-name key. Such memory corruption is defensibly exploitable for kernel information disclosure as part of code execution or memory disclosure primitives.\nI:H - The oversized memcpy can corrupt the kernel stack, including control data, from attacker-controlled network bytes. This supports arbitrary kernel memory modification or code execution in the highest reasonable scenario.\nA:H - Even without reliable code execution, the stack overflow can corrupt kernel control state and readily crash or panic the system. The malformed packet can be sent remotely whenever the vulnerable DLM receive path is reachable."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/dlm/lock.c"], "versions": [{"version": "7210cb7a72a22303cdb225bd1aea28697a17bbae", "lessThan": "0270664871616eb3a5c864b9aa17be76fd35b920", "status": "affected", "versionType": "git"}, {"version": "7210cb7a72a22303cdb225bd1aea28697a17bbae", "lessThan": "c98d071a1ca903b705316225e47006aaa20e989c", "status": "affected", "versionType": "git"}, {"version": "7210cb7a72a22303cdb225bd1aea28697a17bbae", "lessThan": "2deafd015ea9a0e75ee5764e20eb1e16bd73efd8", "status": "affected", "versionType": "git"}, {"version": "7210cb7a72a22303cdb225bd1aea28697a17bbae", "lessThan": "67288113c5e6cf9e659b4065c0ed6f16100e0c71", "status": "affected", "versionType": "git"}, {"version": "7210cb7a72a22303cdb225bd1aea28697a17bbae", 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An attacker could send specially crafted network messages with an oversized length parameter to the dlm_dump_rsb_name() function. This lack of validation can lead to an out-of-bounds write in the dlm_search_rsb_tree() function, potentially causing a buffer overflow. 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{"bugzilla": {"description": "kernel: dlm: validate length in dlm_search_rsb_tree", "id": "2467234", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467234"}, "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": "draft"}, "cwe": "CWE-130", "details": ["A flaw was found in the Linux kernel's Distributed Lock Manager (dlm) module. An attacker could send specially crafted network messages with an oversized length parameter to the dlm_dump_rsb_name() function. This lack of validation can lead to an out-of-bounds write in the dlm_search_rsb_tree() function, potentially causing a buffer overflow. This vulnerability could allow for denial of service or, in some cases, arbitrary code execution."], "name": "CVE-2026-43125", "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": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43125\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43125\nhttps://lore.kernel.org/linux-cve-announce/2026050619-CVE-2026-43125-c9f9@gregkh/T"], "threat_severity": "Important"}

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