5.5

CVE-2026-31660: linux

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-31660DEBIAN-CVE-2026-31660
Published 24-04-2026Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2026-31660 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.1% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.16%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 41 · Related 39
MGASA-2026-0108MGASA-2026-0110OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1

Timeline

  1. 24-04-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

+0.05 pp

From 0.11% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.16%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu145 products
  • linux< 5.15.0-186.196 | < 6.8.0-136.136 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1112.119 | < 6.8.0-1061.64 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ c656aa4c27b17a8c70da223ed5ab42145800d6b5, < 2ca64fb7e2d2ae14619dd204d4f2f0a601f421fb | ≥ c656aa4c27b17a8c70da223ed5ab42145800d6b5, < 8b71299d587d9e4c830c18afb884c80ddb30ad28 | ≥ c656aa4c27b17a8c70da223ed5ab42145800d6b5, < 16649adc2e19509104245ea1f349b629d858f11f | ≥ c656aa4c27b17a8c70da223ed5ab42145800d6b5, < 07cb6c72e66ba548679f22ac29ad588da8999279 | ≥ c656aa4c27b17a8c70da223ed5ab42145800d6b5, < a9495069b43b8634c1ae0042e888766c34f66637 | ≥ c656aa4c27b17a8c70da223ed5ab42145800d6b5, < 21ae2cda66a55c759607bbf1d23cbaa42019d2de | ≥ c656aa4c27b17a8c70da223ed5ab42145800d6b5, < 7e37da42eda45d7859d9273fc7e225d8df458038 | ≥ c656aa4c27b17a8c70da223ed5ab42145800d6b5, < c71ba669b570c7b3f86ec875be222ea11dacb352 | 5.5
  • linux_kernel≥ 5.5.1, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.169 | ≥ 6.2, < 6.6.135 | ≥ 6.7, < 6.12.82 | ≥ 6.13, < 6.18.23 | ≥ 6.19, < 6.19.13 | 5.5 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.13-1

3 vendors · 148 products

References

40 links
Show all 40 references