CVE-2026-31660
MEDIUM SEVERITYCVSS Score & Metrics
Base Score
5.5 / 10
Vector String
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vulnerability 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.
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.
Vulnerability Details
Published Date
Last Modified
CWE ID
NVD-CWE-Other
Source
NVD
Vendor
Linux
Product
Linux
External 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
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