5.5

CVE-2026-53218: linux Use of Uninitialized Resource

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2026-53218DEBIAN-CVE-2026-53218CGA-34xx-cj32-f3r4
Published 25-06-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-53218 is a medium (CVSS 5.5) Use of Uninitialized Resource vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 37 · Related 37
MGASA-2026-0312OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1SUSE-SU-2026:23194-1

Timeline

  1. 25-06-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_exthdr: fix register tracking for F_PRESENT flag nft_exthdr_init() passes user-controlled priv->len to nft_parse_register_store(), which marks that many bytes in the register bitmap as initialized. However, when NFT_EXTHDR_F_PRESENT is set, the eval paths write only 1 byte (nft_reg_store8) or 4 bytes (*dest = 0 on TCP/DCCP error path). When len > 4, registers beyond the first are never written, retaining uninitialized stack data from nft_regs. Bail out if userspace requests too much data when F_PRESENT is set.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.13%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu167 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-146.146 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1066.69 | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard13 products
  • linux-aws-6.12< 6.12.95-r0
  • linux-aws-6.18< 6.18.38-r0
  • linux-azure-6.12< 6.12.95-r0
  • linux-azure-6.18< 6.18.38-r0
  • linux-gcp-6.12< 6.12.95-r0
Linux2 products
  • linux≥ c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < 8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6 | ≥ c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < 19748967d59c31d24d21d40b728570788310b237 | ≥ c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < 46fc15a044e9938e7ea77786fb37edd2cd74f031 | ≥ c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < cd513e43b4b2bd1de39e2367bc4261c699a8652f | ≥ c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < 67b27434c43b68a97becda98c9f0c8cf6cba2134 | ≥ c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < 78069a6d8bc86c9e036eb82c2af4a19cc1871a53 | ≥ c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265 | ≥ c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < 772cecf198da732faebb5dcfc46d66a505be8495 | 4.11
  • linux_kernel≥ 4.11, < 5.10.259 | ≥ 5.11, < 5.15.210 | ≥ 5.16, < 6.1.176 | ≥ 6.2, < 6.6.143 | ≥ 6.7, < 6.12.94 | ≥ 6.13, < 6.18.36 | ≥ 6.19, < 7.0.13 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4 | 7.1:rc5 | 7.1:rc6 | 7.1:rc7
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.13-1

4 vendors · 183 products

References

39 links
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