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If wait_read_barrier() fails for a REQ_NOWAIT\nread, the bio is completed and the function returns immediately. 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{"bugzilla": {"description": "kernel: md/raid1: free r1_bio when REQ_NOWAIT is set and read would block on retry", "id": "2516580", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516580"}, "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"}, "cwe": "CWE-772", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmd/raid1: free r1_bio when REQ_NOWAIT is set and read would block on retry\nWhen a read is retried, raid1_read_request() may be called with a\npre-allocated r1_bio. If wait_read_barrier() fails for a REQ_NOWAIT\nread, the bio is completed and the function returns immediately. In this\ncase the existing r1_bio is leaked.\nThis fixes a leak of pre-allocated r1_bio structures for retried reads.", "A flaw was found in the Linux kernel's md/raid1 component. When a read operation is retried with the `REQ_NOWAIT` flag set, and the `wait_read_barrier()` function fails, a pre-allocated `r1_bio` structure may not be properly freed. This resource leak can accumulate over time, potentially leading to a denial of service (DoS) due to memory exhaustion."], "name": "CVE-2026-72437", "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": "Out of support scope", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72437\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72437\nhttps://lore.kernel.org/linux-cve-announce/2026081528-CVE-2026-72437-a3cd@gregkh/T"], "threat_severity": "Low"}

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