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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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
Show details on NVD website
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    "datePublished": "2026-03-25T10:27:11.028Z",
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    "epss": {
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      "date": "2026-09-14",
      "epss": "0.00122",
      "percentile": "0.02269"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23316\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:28.063\",\"lastModified\":\"2026-06-17T10:21:18.943\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"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.\"},{\"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 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    "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:37:16Z",
      "cve": "CVE-2026-23316",
      "id": "CVE-2026-23316",
      "initial_release_date": "2026-03-25T16:56:33Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "5",
      "product_status:known_not_affected": "423",
      "product_status:recommended": "172",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23316",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23316.json",
      "version": "10"
    }
  }
}



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  • 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.