CVE-2026-31660
Description
In the Linux kernel, the following vulnerability has been resolved: nfc: pn533: allocate rx skb before consuming bytes pn532_receive_buf() reports the number of accepted bytes to the serdev core. The current code consumes bytes into recv_skb and may already hand a complete frame to pn533_recv_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.
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.
OS impact
Linux kernel Affected 3 releases
| Version | Status | Fixed in |
|---|---|---|
| 7.0 | Affected | — |
| 5.5 | Affected | — |
| — | Affected | 5.10.253 |
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.12.85-1 |
| sid | Fixed | 6.19.13-1 |
| forky | Fixed | 6.19.13-1 |
| bullseye | Fixed | 6.1.170-1~deb11u1 |
| bookworm | Fixed | 6.1.170-1 |
References
- https://git.kernel.org/stable/c/07cb6c72e66ba548679f22ac29ad588da8999279
- https://git.kernel.org/stable/c/16649adc2e19509104245ea1f349b629d858f11f
- https://git.kernel.org/stable/c/21ae2cda66a55c759607bbf1d23cbaa42019d2de
- https://git.kernel.org/stable/c/2ca64fb7e2d2ae14619dd204d4f2f0a601f421fb
- https://git.kernel.org/stable/c/7e37da42eda45d7859d9273fc7e225d8df458038
- https://git.kernel.org/stable/c/8b71299d587d9e4c830c18afb884c80ddb30ad28
- https://git.kernel.org/stable/c/a9495069b43b8634c1ae0042e888766c34f66637
- https://git.kernel.org/stable/c/c71ba669b570c7b3f86ec875be222ea11dacb352
- https://www.suse.com/security/cve/CVE-2026-31660.html
- https://security-tracker.debian.org/tracker/CVE-2026-31660
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.