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CVE-2026-64538 (GCVE-0-2026-64538)

Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-09-08 08:50
VLAI
Title
ipv6: Fix null-ptr-deref in fib6_nh_mtu_change().
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix null-ptr-deref in fib6_nh_mtu_change(). fib6_nh_mtu_change() re-fetches idev via __in6_dev_get(arg->dev) and dereferences idev->cnf.mtu6 without a NULL check. addrconf_ifdown() clears dev->ip6_ptr with RCU_INIT_POINTER() after rt6_disable_ip() has released tb6_lock, so the RA-driven MTU walk can observe a NULL idev and oops. The caller rt6_mtu_change_route() guards its own __in6_dev_get(), but this re-fetch is unguarded; nexthop-backed routes survive addrconf_ifdown()'s flush, so the walk still reaches it after ip6_ptr is nulled. Return 0 when idev is NULL, matching rt6_mtu_change_route() and the fib6_mtu() fix in commit 5ad509c1fdad ("ipv6: Fix null-ptr-deref in fib6_mtu()."). Oops: general protection fault, ... KASAN: null-ptr-deref in range [0x00000000000002a8-0x00000000000002af] RIP: 0010:fib6_nh_mtu_change+0x203/0x990 rt6_mtu_change_route+0x141/0x1d0 __fib6_clean_all+0xd0/0x160 rt6_mtu_change+0xb4/0x100 ndisc_router_discovery+0x24b5/0x2cb0 icmpv6_rcv+0x12e9/0x1710 ipv6_rcv+0x39b/0x410
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < d08d019f2f43a6f9a71e81868bbc326b3afaf37b (git)
Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < 1451deca9896957159f0666520a792c1b861af4f (git)
Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < b2c70dd3326809429b709a9c7e9220d29923051a (git)
Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < 302d57ed7872838b40e56a868fb4c7da7da606e9 (git)
Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < 80600b5d0f3ecb9324120dc95b5e915130f516c5 (git)
Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < b0d0eb13a0441a8ebf4f227843deaf494f1e2c33 (git)
Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < 6428634f7a0b7878144b4925c37856bef3224967 (git)
Affected: c0b220cf7d80eb8a36ae9f12cae6df4577a6814e , < 46c3b8191aad3d032776bf3bebf03efdf5f4b905 (git)
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Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-11T10:31:58+00:00",
      "cve": "CVE-2026-64538",
      "id": "CVE-2026-64538",
      "initial_release_date": "2026-07-27T00:00:00+00:00",
      "product_status:known_affected": "202",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv6: Fix null-ptr-deref in fib6_nh_mtu_change()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64538.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-13T17:09:23Z",
      "cve": "CVE-2026-64538",
      "id": "CVE-2026-64538",
      "initial_release_date": "2026-07-28T17:08:09Z",
      "product_status:first_fixed": "65",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "97",
      "product_status:recommended": "46",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64538",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64538.json",
      "version": "9"
    }
  }
}



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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.