Answer in brief
CVE-2025-40043 records a High severity (CVSS 8.8) vulnerability in net: nfc: nci: Add parameter validation for packet data. 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 8.8. 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 | >=6a2968aaf50c7a22fced77a5e24aa636281efca8 <8fcc7315a10a84264e55bb65ede10f0af20a983f || >=6a2968aaf50c7a22fced77a5e24aa636281efca8 <bfdda0123dde406dbff62e7e9136037e97998a15 || >=6a2968aaf50c7a22fced77a5e24aa636281efca8 <0ba68bea1e356f466ad29449938bea12f5f3711f || >=6a2968aaf50c7a22fced77a5e24aa636281efca8 <74837bca0748763a77f77db47a0bdbe63b347628 || >=6a2968aaf50c7a22fced77a5e24aa636281efca8 <c395d1e548cc68e84584ffa2e3ca9796a78bf7b9 || >=6a2968aaf50c7a22fced77a5e24aa636281efca8 <9c328f54741bd5465ca1dc717c84c04242fac2e1 | 8fcc7315a10a84264e55bb65ede10f0af20a983f, bfdda0123dde406dbff62e7e9136037e97998a15, 0ba68bea1e356f466ad29449938bea12f5f3711f, 74837bca0748763a77f77db47a0bdbe63b347628, c395d1e548cc68e84584ffa2e3ca9796a78bf7b9, 9c328f54741bd5465ca1dc717c84c04242fac2e1 |
| Linux/Linuxgeneric | 3.2 | Not reported |
Published upstream
Oct 28, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: net: nfc: nci: Add parameter validation for packet data Syzbot reported an uninitialized value bug in nci_init_req, which was introduced by commit 5aca7966d2a7 ("Merge tag 'perf-tools-fixes-for-v6.17-2025-09-16' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools"). This bug arises due to very limited and poor input validation that was done at nic_valid_size(). This validation only validates the skb->len (directly reflects size provided at the userspace interface) with the length provided in the buffer itself (interpreted as NCI_HEADER). This leads to the processing of memory content at the address assuming the correct layout per what opcode requires there. This leads to the accesses to buffer of `skb_buff->data` which is not assigned anything yet. Following the same silent drop of packets of invalid sizes at `nic_valid_size()`, add validation of the data in the respective handlers and return error values in case of failure. Release the skb if error values are returned from handlers in `nci_nft_packet` and effectively do a silent drop Possible TODO: because we silently drop the packets, the call to `nci_request` will be waiting for completion of request and will face timeouts. These timeouts can get excessively logged in the dmesg. A proper handling of them may require to export `nci_request_cancel` (or propagate error handling from the nft packets handlers).
Quoted source text, attributed separately from HOL analysis.