CVE-2026-43098: Linux kernel · nfc: s3fwrn5: allocate rx skb before consuming bytes
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 11 Nov 2026, 23:24 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- EPSS
- 0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 6 May 2026
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 11 Nov 2026.
Description
In the Linux kernel, the following vulnerability has been resolved: nfc: s3fwrn5: allocate rx skb before consuming bytes s3fwrn82_uart_read() reports the number of accepted bytes to the serdev core. The current code consumes bytes into recv_skb and may already deliver a complete frame before allocating a fresh receive buffer. If that alloc_skb() fails, the callback returns 0 even though it has already consumed bytes, and it leaves recv_skb as NULL for the next receive callback. That breaks the receive_buf() accounting contract and can also lead to a NULL dereference on the next skb_put_u8(). Allocate the receive skb lazily before consuming the next byte instead. If allocation fails, return the number of bytes already accepted.
References
- git.kernel.org/stable/c/20a57de2e79b797ed75382659d52bf4c7d9cb446 (opens in a new tab)
- git.kernel.org/stable/c/e4ab0fd1c91882f2a7846b1817781c8741f7f315 (opens in a new tab)
- git.kernel.org/stable/c/d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156 (opens in a new tab)
- git.kernel.org/stable/c/7c31f7a599cf00fad3c204092a91a924126c67e4 (opens in a new tab)
- git.kernel.org/stable/c/6d931680a9851481c3243689488eafed08eeff71 (opens in a new tab)
- git.kernel.org/stable/c/09822d3d6f68a0cdc4626e0c507324a4927f55a9 (opens in a new tab)
- git.kernel.org/stable/c/5c14a19d5b1645cce1cb1252833d70b23635b632 (opens in a new tab)