CVE-2026-23316 (GCVE-0-2026-23316)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-05-11 22:04
VLAI
Title
net: ipv4: fix ARM64 alignment fault in multipath hash seed
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ipv4: fix ARM64 alignment fault in multipath hash seed `struct sysctl_fib_multipath_hash_seed` contains two u32 fields (user_seed and mp_seed), making it an 8-byte structure with a 4-byte alignment requirement. In `fib_multipath_hash_from_keys()`, the code evaluates the entire struct atomically via `READ_ONCE()`: mp_seed = READ_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed).mp_seed; While this silently works on GCC by falling back to unaligned regular loads which the ARM64 kernel tolerates, it causes a fatal kernel panic when compiled with Clang and LTO enabled. Commit e35123d83ee3 ("arm64: lto: Strengthen READ_ONCE() to acquire when CONFIG_LTO=y") strengthens `READ_ONCE()` to use Load-Acquire instructions (`ldar` / `ldapr`) to prevent compiler reordering bugs under Clang LTO. Since the macro evaluates the full 8-byte struct, Clang emits a 64-bit `ldar` instruction. ARM64 architecture strictly requires `ldar` to be naturally aligned, thus executing it on a 4-byte aligned address triggers a strict Alignment Fault (FSC = 0x21). Fix the read side by moving the `READ_ONCE()` directly to the `u32` member, which emits a safe 32-bit `ldar Wn`. Furthermore, Eric Dumazet pointed out that `WRITE_ONCE()` on the entire struct in `proc_fib_multipath_hash_set_seed()` is also flawed. Analysis shows that Clang splits this 8-byte write into two separate 32-bit `str` instructions. While this avoids an alignment fault, it destroys atomicity and exposes a tear-write vulnerability. Fix this by explicitly splitting the write into two 32-bit `WRITE_ONCE()` operations. Finally, add the missing `READ_ONCE()` when reading `user_seed` in `proc_fib_multipath_hash_seed()` to ensure proper pairing and concurrency safety.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4ee2a8cace3fb9a34aea6a56426f89d26dd514f3 , < 4bdc94d45d5459f0149085dfc1efe733c8e14f11 (git)
Affected: 4ee2a8cace3fb9a34aea6a56426f89d26dd514f3 , < 7e4ad34a8889a6a9e0f6cc7c55d02161fe31a199 (git)
Affected: 4ee2a8cace3fb9a34aea6a56426f89d26dd514f3 , < 607e923a3c1b2120de430b3dcde25ed8ad213c0a (git)
Affected: 4ee2a8cace3fb9a34aea6a56426f89d26dd514f3 , < 4ee7fa6cf78ff26d783d39e2949d14c4c1cd5e7f (git)
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Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv4: fix ARM64 alignment fault in multipath hash seed\n\n`struct sysctl_fib_multipath_hash_seed` contains two u32 fields\n(user_seed and mp_seed), making it an 8-byte structure with a 4-byte\nalignment requirement.\n\nIn `fib_multipath_hash_from_keys()`, the code evaluates the entire\nstruct atomically via `READ_ONCE()`:\n\n    mp_seed = READ_ONCE(net-\u003eipv4.sysctl_fib_multipath_hash_seed).mp_seed;\n\nWhile this silently works on GCC by falling back to unaligned regular\nloads which the ARM64 kernel tolerates, it causes a fatal kernel panic\nwhen compiled with Clang and LTO enabled.\n\nCommit e35123d83ee3 (\"arm64: lto: Strengthen READ_ONCE() to acquire\nwhen CONFIG_LTO=y\") strengthens `READ_ONCE()` to use Load-Acquire\ninstructions (`ldar` / `ldapr`) to prevent compiler reordering bugs\nunder Clang LTO. Since the macro evaluates the full 8-byte struct,\nClang emits a 64-bit `ldar` instruction. ARM64 architecture strictly\nrequires `ldar` to be naturally aligned, thus executing it on a 4-byte\naligned address triggers a strict Alignment Fault (FSC = 0x21).\n\nFix the read side by moving the `READ_ONCE()` directly to the `u32`\nmember, which emits a safe 32-bit `ldar Wn`.\n\nFurthermore, Eric Dumazet pointed out that `WRITE_ONCE()` on the entire\nstruct in `proc_fib_multipath_hash_set_seed()` is also flawed. Analysis\nshows that Clang splits this 8-byte write into two separate 32-bit\n`str` instructions. While this avoids an alignment fault, it destroys\natomicity and exposes a tear-write vulnerability. Fix this by\nexplicitly splitting the write into two 32-bit `WRITE_ONCE()`\noperations.\n\nFinally, add the missing `READ_ONCE()` when reading `user_seed` in\n`proc_fib_multipath_hash_seed()` to ensure proper pairing and\nconcurrency safety."
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          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: ipv4: solucionar fallo de alineaci\u00f3n ARM64 en la semilla de hash multipath\n\n\u0027struct sysctl_fib_multipath_hash_seed\u0027 contiene dos campos u32 (user_seed y mp_seed), convirti\u00e9ndola en una estructura de 8 bytes con un requisito de alineaci\u00f3n de 4 bytes.\n\nEn \u0027fib_multipath_hash_from_keys()\u0027, el c\u00f3digo eval\u00faa la estructura completa at\u00f3micamente a trav\u00e9s de \u0027READ_ONCE()\u0027:\n\n    mp_seed = \u0027READ_ONCE\u0027(net-\u0026gt;ipv4.sysctl_fib_multipath_hash_seed).mp_seed;\n\nAunque esto funciona silenciosamente en GCC al recurrir a cargas regulares no alineadas que el kernel ARM64 tolera, causa un p\u00e1nico fatal del kernel cuando se compila con Clang y LTO habilitado.\n\nEl commit e35123d83ee3 (\u0027arm64: lto: Strengthen \u0027READ_ONCE()\u0027 to acquire when CONFIG_LTO=y\u0027) refuerza \u0027READ_ONCE()\u0027 para usar instrucciones Load-Acquire (\u0027ldar\u0027 / \u0027ldapr\u0027) para prevenir errores de reordenamiento del compilador bajo Clang LTO. Dado que la macro eval\u00faa la estructura completa de 8 bytes, Clang emite una instrucci\u00f3n \u0027ldar\u0027 de 64 bits. La arquitectura ARM64 requiere estrictamente que \u0027ldar\u0027 est\u00e9 naturalmente alineado, por lo tanto, ejecutarlo en una direcci\u00f3n alineada a 4 bytes desencadena un fallo de alineaci\u00f3n estricto (FSC = 0x21).\n\nSolucionar el lado de lectura moviendo \u0027READ_ONCE()\u0027 directamente al miembro \u0027u32\u0027, lo que emite un \u0027ldar Wn\u0027 seguro de 32 bits.\n\nAdem\u00e1s, Eric Dumazet se\u00f1al\u00f3 que \u0027WRITE_ONCE()\u0027 en la estructura completa en \u0027proc_fib_multipath_hash_set_seed()\u0027 tambi\u00e9n es defectuoso. El an\u00e1lisis muestra que Clang divide esta escritura de 8 bytes en dos instrucciones \u0027str\u0027 separadas de 32 bits. Aunque esto evita un fallo de alineaci\u00f3n, destruye la atomicidad y expone una vulnerabilidad de escritura fragmentada. Solucionar esto dividiendo expl\u00edcitamente la escritura en dos operaciones \u0027WRITE_ONCE()\u0027 de 32 bits.\n\nFinalmente, a\u00f1adir el \u0027READ_ONCE()\u0027 faltante al leer \u0027user_seed\u0027 en \u0027proc_fib_multipath_hash_seed()\u0027 para asegurar un emparejamiento adecuado y seguridad de concurrencia."
          }
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        "id": "CVE-2026-23316",
        "lastModified": "2026-06-17T10:21:18.943",
        "metrics": {
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                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
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              "source": "nvd@nist.gov",
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        "published": "2026-03-25T11:16:28.063",
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        "vulnStatus": "Analyzed",
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              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:20:08+00:00",
      "cve": "CVE-2026-23316",
      "id": "CVE-2026-23316",
      "initial_release_date": "2026-03-25T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: ipv4: fix ARM64 alignment fault in multipath hash seed",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23316.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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.