7.8

CVE-2021-46991: i40e: Fix use-after-free in i40e_client_subtask()

Analyzed
AliasesUBUNTU-CVE-2021-46991DEBIAN-CVE-2021-46991
Published 28-02-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-46991 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.24%
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 6 · Related 6
SUSE-SU-2024:0925-1SUSE-SU-2024:0975-1SUSE-SU-2024:0976-1SUSE-SU-2024:1454-1SUSE-SU-2024:1465-1SUSE-SU-2024:1489-1

Timeline

  1. 28-02-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: i40e: Fix use-after-free in i40e_client_subtask() Currently the call to i40e_client_del_instance frees the object pf->cinst, however pf->cinst->lan_info is being accessed after the free. Fix this by adding the missing return. Addresses-Coverity: ("Read from pointer after free")

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% 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.

Ubuntu82 products
  • linux< 5.4.0-80.90
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.4.0-1054.57
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 7b0b1a6d0ac983ce1928432285d0222d4fb7c38b, < c1322eaeb8af0d8985b5cc5fa759140fa0e57b84 | ≥ 7b0b1a6d0ac983ce1928432285d0222d4fb7c38b, < d718c15a2bf9ae082d5ae4d177fb19ef23cb4132 | ≥ 7b0b1a6d0ac983ce1928432285d0222d4fb7c38b, < 829a713450b8fb127cbabfc1244c1d8179ec5107 | ≥ 7b0b1a6d0ac983ce1928432285d0222d4fb7c38b, < 4ebc10aa7cd17fd9857dedac69600465c9dd16d1 | ≥ 7b0b1a6d0ac983ce1928432285d0222d4fb7c38b, < 1fd5d262e7442192ac7611ff1597a36c5b044323 | ≥ 7b0b1a6d0ac983ce1928432285d0222d4fb7c38b, < 38318f23a7ef86a8b1862e5e8078c4de121960c3 | 4.16
  • linux_kernel≥ 4.16, < 4.19.191 | ≥ 4.20, < 5.4.120 | ≥ 5.5, < 5.10.38 | ≥ 5.11, < 5.11.22 | ≥ 5.12, < 5.12.5
Debian1 product
  • linux< 5.10.38-1

3 vendors · 85 products

References

10 links