7.8

CVE-2021-46998: ethernet:enic: Fix a use after free bug in enic_hard_start_xmit

Modified
AliasesUBUNTU-CVE-2021-46998DEBIAN-CVE-2021-46998
Published 28-02-2024Last modified 05-08-2026

Vulnerability summary

CVE-2021-46998 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 15.7% 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 (CVE.org)
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-2024:1454-1SUSE-SU-2024:1465-1SUSE-SU-2024:1489-1SUSE-SU-2024:1643-1SUSE-SU-2024:1646-1SUSE-SU-2024:1870-1

Timeline

  1. 28-02-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ethernet:enic: Fix a use after free bug in enic_hard_start_xmit In enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside enic_queue_wq_skb, if some error happens, the skb will be freed by dev_kfree_skb(skb). But the freed skb is still used in skb_tx_timestamp(skb). My patch makes enic_queue_wq_skb() return error and goto spin_unlock() incase of error. The solution is provided by Govind. See https://lkml.org/lkml/2021/4/30/961.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

16%

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≥ fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3, < 25a87b1f566b5eb2af2857a928f0e2310d900976 | ≥ fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3, < f7f6f07774091a6ddd98500b85386c3c6afb30d3 | ≥ fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3, < 7afdd6aba95c8a526038e7abe283eeac3e4320f1 | ≥ fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3, < 6892396ebf04ea2c021d80e10f4075e014cd7cc3 | ≥ fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3, < d90529392aaf498dafa95d212295d64b2cea4e24 | ≥ fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3, < 643001b47adc844ae33510c4bb93c236667008a3 | 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