Bug 2516900 (CVE-2026-74394)

Summary: CVE-2026-74394 kernel: RDMA/srpt: fix integer overflow in immediate data length check
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Remote Direct Memory Access (RDMA) SCSI RDMA Protocol (SRP) Target (srpt) component. A remote attacker could exploit an integer overflow vulnerability in the immediate data length check. By sending a specially crafted network packet, a malicious initiator can cause the length calculation to wrap around, bypassing security checks and potentially leading to memory corruption or a denial of service.
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Description OSIDB Bzimport 2026-08-15 06:39:21 UTC 
In the Linux kernel, the following vulnerability has been resolved:

RDMA/srpt: fix integer overflow in immediate data length check

imm_buf->len is a user-controlled uint32_t received from the network.
Adding it to imm_data_offset without overflow checking allows a
malicious initiator to send len=0xFFFFFFFF, causing req_size to wrap
around to a small value, bypassing the bounds check, and subsequently
passing a ~4GB length to sg_init_one().

Use check_add_overflow() to detect wrapping before the comparison.
Comment 1 Keith Grant 2026-08-20 20:37:35 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081507-CVE-2026-74394-6792@gregkh/T