Bug 2536285 (CVE-2026-90145)

Summary: CVE-2026-90145 kernel: hinic3: Fix skb linearization mismatch and drop skb when skb_checksum_help() failed
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, 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 hinic3 network driver in the Linux kernel. This vulnerability occurs when the driver incorrectly handles skb (socket buffer) linearization, leading to a mismatch in the fragment count used for building transmit descriptors. This can result in out-of-bounds Direct Memory Access (DMA) reads or Input/Output Memory Management Unit (IOMMU) faults, potentially allowing an attacker to cause a denial of service or information disclosure. Additionally, the flaw could lead to the transmission of corrupted packets with incomplete checksums.
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Description OSIDB Bzimport 2026-09-17 17:16:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

hinic3: Fix skb linearization mismatch and drop skb when skb_checksum_help() failed

Previously, hinic3_send_one_skb() cached the skb fragment count before
calling hinic3_tx_offload(). If hinic3_tx_csum() falls back to
skb_checksum_help() for unsupported tunnel packets, the skb may be
linearized. Continuing to build the TX descriptor with the stale
fragment count leads to a descriptor mismatch, which can trigger
out-of-bounds DMA reads or IOMMU faults.

Furthermore, the old code ignored the return value of skb_checksum_help(),
transmitting corrupted packets with incomplete checksums upon failure.

Fix this by:
1. Moving the hinic3_tx_offload() call before calculating 'num_sge' to
   ensure the correct fragment count is used if the SKB is linearized.
2. Propagating skb_checksum_help() errors and returning
   HINIC3_TX_OFFLOAD_INVALID to properly drop the skb.
Comment 1 Keith Grant 2026-09-23 16:49:20 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90145.mbox