Answer in brief
CVE-2025-40337 records a High severity (CVSS 8.2) vulnerability in net: stmmac: Correctly handle Rx checksum offload errors. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=3c20f72f9108b2fcf30ec63d8a4203736c01ccd0 <3c5e5fccc4138c072d99be4ebe6b16df6a70a40c || >=3c20f72f9108b2fcf30ec63d8a4203736c01ccd0 <63fbe0e6413279d5ea5842e2423e351ded547683 || >=3c20f72f9108b2fcf30ec63d8a4203736c01ccd0 <719fcdf29051f7471d5d433475af76219019d33d || >=3c20f72f9108b2fcf30ec63d8a4203736c01ccd0 <1aa319e0f12d2d761a31556b82a5852c98eb0bea || >=3c20f72f9108b2fcf30ec63d8a4203736c01ccd0 <ee0aace5f844ef59335148875d05bec8764e71e8 | 3c5e5fccc4138c072d99be4ebe6b16df6a70a40c, 63fbe0e6413279d5ea5842e2423e351ded547683, 719fcdf29051f7471d5d433475af76219019d33d, 1aa319e0f12d2d761a31556b82a5852c98eb0bea, ee0aace5f844ef59335148875d05bec8764e71e8 |
| Linux/Linuxgeneric | 3.2 | Not reported |
Published upstream
Dec 9, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 22, 2026
In the Linux kernel, the following vulnerability has been resolved: net: stmmac: Correctly handle Rx checksum offload errors The stmmac_rx function would previously set skb->ip_summed to CHECKSUM_UNNECESSARY if hardware checksum offload (CoE) was enabled and the packet was of a known IP ethertype. However, this logic failed to check if the hardware had actually reported a checksum error. The hardware status, indicating a header or payload checksum failure, was being ignored at this stage. This could cause corrupt packets to be passed up the network stack as valid. This patch corrects the logic by checking the `csum_none` status flag, which is set when the hardware reports a checksum error. If this flag is set, skb->ip_summed is now correctly set to CHECKSUM_NONE, ensuring the kernel's network stack will perform its own validation and properly handle the corrupt packet.
Quoted source text, attributed separately from HOL analysis.