CVE-2025-37909: Linux kernel · net: lan743x: Fix memleak issue when GSO enabled
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 10 Nov 2026, 14:47 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 20 May 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.
What to do
AI-suggested
A fix has been implemented in the Linux kernel to correct the skb mapping behavior in the lan743x driver when GSO is enabled. Users should apply the updated kernel version containing this fix once it is available. Patch status is not explicitly confirmed in the provided data; therefore, check the official Linux kernel advisories for the exact fixed versions and apply updates accordingly.
Description
A memory leak vulnerability in the Linux kernel's lan743x network driver was fixed. The issue occurred when Generic Segmentation Offload (GSO) was enabled, causing skb buffers to be incorrectly mapped to EXT descriptors instead of LS descriptors when there were zero fragments. This incorrect mapping prevented skb buffers from being freed, leading to a memory leak.
References
- git.kernel.org/stable/c/093855ce90177488eac772de4eefbb909033ce5f (opens in a new tab)
- git.kernel.org/stable/c/6c65ee5ad632eb8dcd3a91cf5dc99b22535f44d9 (opens in a new tab)
- git.kernel.org/stable/c/df993daa4c968b4b23078eacc248f6502ede8664 (opens in a new tab)
- git.kernel.org/stable/c/a0e0efbabbbe6a1859bc31bf65237ce91e124b9b (opens in a new tab)
- git.kernel.org/stable/c/dae1ce27ceaea7e1522025b15252e3cc52802622 (opens in a new tab)
- git.kernel.org/stable/c/189b05f189cac9fd233ef04d31cb5078c4d09c39 (opens in a new tab)
- git.kernel.org/stable/c/f42c18e2f14c1b1fdd2a5250069a84bc854c398c (opens in a new tab)
- git.kernel.org/stable/c/2d52e2e38b85c8b7bc00dca55c2499f46f8c8198 (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/10/msg00007.html (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/08/msg00010.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)