CVE-2025-40337net: stmmac: Correctly handle Rx checksum offload errors
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Deferred
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 3c20f72f9108b2fcf30ec63d8a4203736c01ccd0 before 63fbe0e6413279d5ea5842e2423e351ded547683; from 3c20f72f9108b2fcf30ec63d8a4203736c01ccd0 before 719fcdf29051f7471d5d433475af76219019d33d; 3c20f72f9108b2fcf30ec63d8a4203736c01ccd0 builds before 1aa319e0f12d2d761a31556b82a5852c98eb0bea; from 3c20f72f9108b2fcf30ec63d8a4203736c01ccd0 before ee0aace5f844ef59335148875d05bec8764e71e8 | CNA record |
References
- https://git.kernel.org/stable/c/63fbe0e6413279d5ea5842e2423e351ded547683
- https://git.kernel.org/stable/c/719fcdf29051f7471d5d433475af76219019d33d
- https://git.kernel.org/stable/c/1aa319e0f12d2d761a31556b82a5852c98eb0bea
- https://git.kernel.org/stable/c/ee0aace5f844ef59335148875d05bec8764e71e8
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.