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netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-52998

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-52998

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
        "lessThan": "f4de0777e4554a7de19c920accde6319dd530782",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
        "lessThan": "c996a90f3071cf43683e5423da31aadbe002b8b4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
        "lessThan": "edc806f9122961f0d3819f7c69c14cccde31f277",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
        "lessThan": "5d05de2f0928d81309a815ecc76d1a3ad72cbc16",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
        "lessThan": "95be653a76793856ff8b2d8bd82c2943c23f5ca8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
        "lessThan": "79b90a96688e521771fa6ed3dc7864b76b8df293",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
        "lessThan": "83fc5dd63455a779ea2dd0f7ffee3c920919d80b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
        "lessThan": "711987ba281fd806322a7cd244e98e2a81903114",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nfnetlink_osf.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.31"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.31",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.141",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.91",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.33",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nfnetlink_osf.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-52998

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40727 · Revision 1
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Publisher date
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