9.8

CVE-2022-49561: netfilter: conntrack: re-fetch conntrack after insertion

Modified
AliasesUBUNTU-CVE-2022-49561DEBIAN-CVE-2022-49561
Published 26-02-2025Last modified 05-08-2026

Vulnerability summary

CVE-2022-49561 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.82% chance of exploitation in the next 30 days, higher than 57.3% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.82%
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 3 · Related 1
RHSA-2022:7683RHSA-2022:8267SUSE-SU-2025:01600-1

Timeline

  1. 26-02-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: re-fetch conntrack after insertion In case the conntrack is clashing, insertion can free skb->_nfct and set skb->_nfct to the already-confirmed entry. This wasn't found before because the conntrack entry and the extension space used to free'd after an rcu grace period, plus the race needs events enabled to trigger.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.82%

Chance of exploitation in the next 30 days

Percentile

57%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.82% 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

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu110 products
  • linux< 4.15.0-191.202 | < 5.4.0-126.142 | < 5.15.0-47.51
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.15.0-1139.150 | < 5.4.0-1085.92 | < 5.15.0-1019.23
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 71d8c47fc653711c41bc3282e5b0e605b3727956, < e97222b785e70e8973281666d709baad6523d8af | ≥ 71d8c47fc653711c41bc3282e5b0e605b3727956, < 92a999d1963eed0df666284e20055136ceabd12f | ≥ 71d8c47fc653711c41bc3282e5b0e605b3727956, < b16bb373988da3ceb0308381634117e18b6ec60d | ≥ 71d8c47fc653711c41bc3282e5b0e605b3727956, < 91a36ec160ec1a0c8f5352b772dffcbb0b6023e3 | ≥ 71d8c47fc653711c41bc3282e5b0e605b3727956, < 01989d7eebb61c99bd4b88ebc8e261bd2f02caed | ≥ 71d8c47fc653711c41bc3282e5b0e605b3727956, < 04f9e9104c969d8ce10a4a43634f641ed082092d | ≥ 71d8c47fc653711c41bc3282e5b0e605b3727956, < 04e4a11dc723c52db7a36dc58f0d69ce6426f8f0 | ≥ 71d8c47fc653711c41bc3282e5b0e605b3727956, < 56b14ecec97f39118bf85c9ac2438c5a949509ed | 4.7
  • linux_kernel≥ 4.7, < 4.14.282 | ≥ 4.15, < 4.19.246 | ≥ 4.20, < 5.4.197 | ≥ 5.5, < 5.10.120 | ≥ 5.11, < 5.15.45 | ≥ 5.16, < 5.17.13 | ≥ 5.18, < 5.18.2
Debian1 product
  • linux< 5.18.2-1

3 vendors · 113 products

References

12 links
Show all 12 references