What’s Vulnerable › Vulnerabilities

CVE-2026-52970: netfilter: nft_ct: fix missing expect put in obj eval

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-24 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: fix missing expect put in obj eval nft_ct_expect_obj_eval() allocates an expectation and may call nf_ct_expect_related(), but never drops its local reference. Add nf_ct_expect_put(exp) before return to balance allocation.

Affected products

• Linux kernel: from 5.3 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33 — fixed in 5.10.258, 5.15.209, 6.1.175, 6.12.91, 6.18.33, 6.6.141

How to fix

Upgrade to a fixed version: Linux kernel 5.10.258, 5.15.209, 6.1.175, 6.12.91. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/19f94b6fee75b3ef7fbc06f3745b9a771a8a19a4
• https://git.kernel.org/stable/c/1dced0725e2fae3ac3416274db20a7ff5a46931d
• https://git.kernel.org/stable/c/26ab32ec73941871c97562ee1f39587950dc3b68
• https://git.kernel.org/stable/c/2aef1b13d5c0285f340512c6c07eb858fd018fd8
• https://git.kernel.org/stable/c/7b96242ceedfe249f158419f3254bcee04173ffe
• https://git.kernel.org/stable/c/84c422cea5a45fe56be839f25880f21fd33940cd
• https://git.kernel.org/stable/c/cdb9a25dd3416d427e8b2753210f8baf44207577
• https://git.kernel.org/stable/c/ecca618e1e339494911090474ed87742c0f73976
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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