5.5

CVE-2021-46924: NFC: st21nfca: Fix memory leak in device probe and remove

Modified
AliasesUBUNTU-CVE-2021-46924DEBIAN-CVE-2021-46924
Published 27-02-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-46924 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.23%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 13 · Related 13
SUSE-SU-2024:0855-1SUSE-SU-2024:0856-1SUSE-SU-2024:0857-1SUSE-SU-2024:0858-1SUSE-SU-2024:0900-1SUSE-SU-2024:0900-2

Timeline

  1. 27-02-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: NFC: st21nfca: Fix memory leak in device probe and remove 'phy->pending_skb' is alloced when device probe, but forgot to free in the error handling path and remove path, this cause memory leak as follows: unreferenced object 0xffff88800bc06800 (size 512): comm "8", pid 11775, jiffies 4295159829 (age 9.032s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000d66c09ce>] __kmalloc_node_track_caller+0x1ed/0x450 [<00000000c93382b3>] kmalloc_reserve+0x37/0xd0 [<000000005fea522c>] __alloc_skb+0x124/0x380 [<0000000019f29f9a>] st21nfca_hci_i2c_probe+0x170/0x8f2 Fix it by freeing 'pending_skb' in error and remove.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.23% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu88 products
  • linux< 4.4.0-258.292 | < 4.15.0-173.182 | < 5.4.0-105.119
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1135.141 | < 4.4.0-1173.188 | < 4.15.0-1124.133 | < 5.4.0-1069.73
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 68957303f44a501af5cf37913208a2acaa6bcdf1, < 38c3e320e7ff46f2dc67bc5045333e63d9f8918d | ≥ 68957303f44a501af5cf37913208a2acaa6bcdf1, < a1e0080a35a16ce3808f7040fe0c3a8fdb052349 | ≥ 68957303f44a501af5cf37913208a2acaa6bcdf1, < 1cd4063dbc91cf7965d73a6a3855e2028cd4613b | ≥ 68957303f44a501af5cf37913208a2acaa6bcdf1, < e553265ea56482da5700f56319fda9ff53e7dcb4 | ≥ 68957303f44a501af5cf37913208a2acaa6bcdf1, < 238920381b8925d070d32d73cd9ce52ab29896fe | ≥ 68957303f44a501af5cf37913208a2acaa6bcdf1, < 1b9dadba502234eea7244879b8d5d126bfaf9f0c | 3.16
  • linux_kernel≥ 3.16.0, < 4.14.261 | ≥ 4.15.0, < 4.19.224 | ≥ 4.20.0, < 5.4.170 | ≥ 5.5.0, < 5.10.90 | ≥ 5.11.0, < 5.15.13
Debian1 product
  • linux< 5.15.15-1

3 vendors · 91 products

References

11 links
Show all 11 references