CVE-2026-52998 (GCVE-0-2026-52998)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-08-05 12:32
VLAI
Title
netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check The nf_osf_ttl() function accessed skb->dev to perform a local interface address lookup without verifying that the device pointer was valid. Additionally, the implementation utilized an in_dev_for_each_ifa_rcu loop to match the packet source address against local interface addresses. It assumed that packets from the same subnet should not see a decrement on the initial TTL. A packet might appear it is from the same subnet but it actually isn't especially in modern environments with containers and virtual switching. Remove the device dereference and interface loop. Replace the logic with a switch statement that evaluates the TTL according to the ttl_check.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < f4de0777e4554a7de19c920accde6319dd530782 (git)
Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < c996a90f3071cf43683e5423da31aadbe002b8b4 (git)
Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < edc806f9122961f0d3819f7c69c14cccde31f277 (git)
Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < 5d05de2f0928d81309a815ecc76d1a3ad72cbc16 (git)
Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < 95be653a76793856ff8b2d8bd82c2943c23f5ca8 (git)
Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < 79b90a96688e521771fa6ed3dc7864b76b8df293 (git)
Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < 83fc5dd63455a779ea2dd0f7ffee3c920919d80b (git)
Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < 711987ba281fd806322a7cd244e98e2a81903114 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.31
Unaffected: 0 , < 2.6.31 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:35:51+00:00",
      "cve": "CVE-2026-52998",
      "id": "CVE-2026-52998",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52998.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-31T16:38:10Z",
      "cve": "CVE-2026-52998",
      "id": "CVE-2026-52998",
      "initial_release_date": "2026-06-26T02:14:05Z",
      "product_status:known_affected": "295",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-52998",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52998.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.