CVE-2026-80796
Description
In the Linux kernel, the following vulnerability has been resolved: nfc: nci: add data_len bound checks to activation parameter extractors nci_extract_activation_params_iso_dep() and nci_extract_activation_params_nfc_dep() read an inner length byte from the NCI RF_INTF_ACTIVATED_NTF payload and use it to memcpy() into fixed kernel buffers, but neither function receives the caller-validated activation_params_len. A crafted NCI notification with activation_params_len=1 and an inner length byte of up to 20 (NFC-A) or 50 (NFC-B) causes memcpy() to read that many bytes past the one valid byte in the activation params region -- a slab out-of-bounds read of kernel memory adjacent to the NCI skb. The sibling nci_extract_rf_params_*() family was given equivalent protection by commit 571dcbeb8e63 ("net: nfc: nci: Fix parameter validation for packet data"), but the two activation parameter extractors were not updated at that time. Add a data_len parameter to both functions, guard against an empty region before consuming the inner length byte, decrement the remaining count after consuming it, and clamp the copy length to what is actually available. Update both call sites to pass ntf.activation_params_len, which is already validated against the skb at ntf.c:801.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
References
- https://git.kernel.org/stable/c/0428fa2c22e2ba0cff766d3b80d461e149102045
- https://git.kernel.org/stable/c/04e51353cb9fa321caaeeed8331d4cd041fbaca7
- https://git.kernel.org/stable/c/1168484fe2b3828bf24a46f3c42a8719fade679b
- https://git.kernel.org/stable/c/9620a91f8d643b680f417a435db399a04d1e06d8
- https://git.kernel.org/stable/c/9b01f5af0dc59263b59391b148bc78d83c0354a9
- https://git.kernel.org/stable/c/be311c0cfeadfbe815ea22d2914a98d06e3fab0e
- https://git.kernel.org/stable/c/cf9d44be50b9074a5abdc301b4a3ba3e283591df
- https://git.kernel.org/stable/c/e25b44bd8b8cc666b49a3fe0ef547e64d5b1e300
- https://git.kernel.org/stable/c/f5c534b53f8c424a8e7633c9b585475c4bf4ee18
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.