7.8

CVE-2021-47301: igb: Fix use-after-free error during reset

Analyzed
AliasesUBUNTU-CVE-2021-47301DEBIAN-CVE-2021-47301
Published 21-05-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47301 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 7 · Related 6
RHSA-2022:1988SUSE-SU-2024:1979-1SUSE-SU-2024:1983-1SUSE-SU-2024:2010-1SUSE-SU-2024:2183-1SUSE-SU-2024:2184-1

Timeline

  1. 21-05-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: igb: Fix use-after-free error during reset Cleans the next descriptor to watch (next_to_watch) when cleaning the TX ring. Failure to do so can cause invalid memory accesses. If igb_poll() runs while the controller is reset this can lead to the driver try to free a skb that was already freed. (The crash is harder to reproduce with the igb driver, but the same potential problem exists as the code is identical to igc)

CVSS metrics

3 scores · 3 sources · 1 version

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.

Ubuntu86 products
  • linux< 4.15.0-159.167 | < 5.4.0-88.99
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.15.0-1112.119 | < 5.4.0-1057.60
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 7cc6fd4c60f267e17b0baef1580d7a6258c0a6f0, < d7367f781e5a9ca5df9082b15b272b55e76931f8 | ≥ 7cc6fd4c60f267e17b0baef1580d7a6258c0a6f0, < d3ccb18ed5ac3283c7b31ecc685b499e580d5492 | ≥ 7cc6fd4c60f267e17b0baef1580d7a6258c0a6f0, < 88e0720133d42d34851c8721cf5f289a50a8710f | ≥ 7cc6fd4c60f267e17b0baef1580d7a6258c0a6f0, < f153664d8e70c11d0371341613651e1130e20240 | ≥ 7cc6fd4c60f267e17b0baef1580d7a6258c0a6f0, < 8e24c12f2ff6d32fd9f057382f08e748ec97194c | ≥ 7cc6fd4c60f267e17b0baef1580d7a6258c0a6f0, < 7b292608db23ccbbfbfa50cdb155d01725d7a52e | 4.12
  • linux_kernel≥ 4.12, < 4.14.241 | ≥ 4.15, < 4.19.199 | ≥ 4.20, < 5.4.136 | ≥ 5.5, < 5.10.54 | ≥ 5.11, < 5.13.6 | 5.14:rc1
Debian1 product
  • linux< 5.14.6-1

3 vendors · 89 products

References

10 links