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Security Digest · Vulnerability record · Known exploited

CVE-2022-2586: Linux Kernel Use-After-Free Vulnerability

Exploited in the wild (CISA KEV). It was discovered that a nft object or expression could reference a nft set on a different nft table, leading to a use-after-free once that table was deleted.

CISA KEV · added 2024-06-26 CVSS 5.3 Medium EPSS 10.2% · p96

Updated By erroneo.us Security Desk20 references Seen in the digest for Jun 26, 2024

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

  • Yes, if you run Linux Kernel. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-06-26, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-07-17; treat that as the outer limit, not the target.
  • EPSS 10.2%, percentile 96: FIRST’s model estimates a 10.2% chance of exploitation activity in the next 30 days, higher than 96% of all scored CVEs (very high). EPSS is a probability, not a verdict.
  • Needs local access needed. Lower urgency for most teams unless an attacker could already run code on the machine.

What it is

It was discovered that a nft object or expression could reference a nft set on a different nft table, leading to a use-after-free once that table was deleted.

CISA’s summary

Linux Kernel contains a use-after-free vulnerability in the nft_object, allowing local attackers to escalate privileges.

Weakness type: CWE-416.

Product: Linux Kernel · Assigned by: canonical · Published: 2024-01-08

Affected and fixed versions

VendorProductAffected versions (per CVE record)
The Linux Kernel Organizationlinux3.16 < 4.14.316, 4.15 < 4.19.256, 4.20 < 5.4.211, 5.5 < 5.10.137, 5.11 < 5.15.61, 5.16 < 5.18.18, 5.19 < 5.19.2

Severity scores

Scored byCVSSScoreVector
canonical3.15.3 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H
  • Attack vector: local access needed
  • Attack complexity: high (needs special conditions)
  • Privileges required: low (any account)
  • User interaction: none
  • Scope: unchanged

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

  • CISA KEV: added 2024-06-26; federal due date 2024-07-17. Known ransomware use: Unknown.
  • CISA required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
  • CISA SSVC assessment: exploitation active, automatable no, technical impact total.
  • FIRST EPSS (model of 2026-10-21): 10.20% probability of exploitation activity in the next 30 days; percentile 96.

Timeline

  • — CVE record published by canonical
  • — Added to CISA’s Known Exploited Vulnerabilities catalog
  • — CISA remediation deadline for US federal agencies
  • — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

  1. Listed in CISA KEV notes (seclists.org) seclists.org

Vulnerability records

  1. CVE.org record CVE-2022-2586 cve.org
  2. NVD entry CVE-2022-2586 nvd.nist.gov

Government

  1. CISA Known Exploited Vulnerabilities catalog entry cisa.gov

Other references from the CVE record and advisory

  1. ubuntu.com ubuntu.com
  2. ubuntu.com ubuntu.com
  3. ubuntu.com ubuntu.com
  4. ubuntu.com ubuntu.com
  5. ubuntu.com ubuntu.com
  6. ubuntu.com ubuntu.com
  7. openwall.com openwall.com
  8. ubuntu.com ubuntu.com
  9. zerodayinitiative.com zerodayinitiative.com
  10. lore.kernel.org lore.kernel.org
  11. ubuntu.com ubuntu.com
  12. ubuntu.com ubuntu.com
  13. cve.mitre.org cve.mitre.org
  14. vicarius.io vicarius.io
  15. cert-portal.siemens.com cert-portal.siemens.com
  16. cert-portal.siemens.com cert-portal.siemens.com

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