CVE-2026-97583

Estado: RecibidaAlta (7.5)—

In the Linux kernel, the following vulnerability has been resolved:

afs: Clear stale peer app data after address list changes

afs_fs_probe_fileserver() fetches the current endpoint state under server->fs_lock, but leaves old_alist as NULL. Consequently, afs_set_peer_appdata() treats every address list replacement as initial setup and only binds the new peers; it never unbinds peers removed from the old list.

An address refresh can therefore proceed as follows. CPU 0 replaces server S's list and drops Pold without clearing Pold->app_data.

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The server destroyer then clears only S's current peers and lets S reach its RCU callback. After the callback frees S, CPU 1 handles a callback through an RxRPC connection that still pins Pold, reads Pold->app_data, and calls afs_use_server() on the freed object.

Preserve old->addresses for the peer app-data update so that removed peers are cleared before the endpoint state is replaced. Also advance both cursors when the old and new lists share a peer; activating the old/new comparison without this would otherwise loop forever on the shared entry.

Detalles técnicos trazas, registros y código del informe original

KASAN reported:

  BUG: KASAN: slab-use-after-free in afs_find_server+0x3c/0xa0
  Read of size 4 at addr ffff8881013e1af0 by task krxrpcio/7001/74
  Call Trace:
   afs_find_server+0x3c/0xa0
   afs_rx_new_call+0x15c/0x390
   rxrpc_new_incoming_call+0x97c/0x1730
   rxrpc_input_packet.constprop.0+0xd03/0xec0
   rxrpc_io_thread+0x967/0x1640
  Allocated by task 93:
   afs_lookup_server+0x1a7/0x14c0
   afs_alloc_server_list+0x43f/0xb60
   afs_create_volume+0x923/0x1490
   afs_get_tree+0x1c6/0x10a0
  Freed by task 0:
   kfree+0x131/0x3c0
   rcu_core+0x50a/0x1850
  Last potentially related work creation:
   __call_rcu_common.constprop.0+0x71/0xa10
   afs_put_server+0x213/0x2b0

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Puntuación base: 7.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.41%
Percentil entre todas las CVEs puntuadas: 33
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1203 Exploitation for Client Executionexecution45 %
Impacto principalT1499.004 Application or System Exploitationimpact35 %
Impacto secundarioT1053 Scheduled Task/Jobexecution · persistence · privilege escalation30 %

Vulnerabilidad de use-after-free en kernel Linux que requiere condiciones de carrera y interacción (RxRPC callbacks). Impacto potencial: DoS por corrupción de memoria o ejecución arbitraria, pero el texto enfatiza el crash KASAN sin indicar RCE explícito.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

User Account Management Restrict File and Directory Permissions Privileged Account Management Operating System Configuration Filter Network Traffic Audit

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-97583",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.6
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "39ba6af83a7f9dee3e6a7916f41a48bcbda54eba",
              "lessThan": "3afb988fd0411707bdafb9b321086fff0da28aae",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "40e8b52fe8c8ab6920ea5f59c5469b6918cce624",
              "lessThan": "c7f77a11a1e719192c7262aad38a3919aec62c21",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "40e8b52fe8c8ab6920ea5f59c5469b6918cce624",
              "lessThan": "7f7f5589d048821dea316cbac9b37d27eaf7530e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "40e8b52fe8c8ab6920ea5f59c5469b6918cce624",
              "lessThan": "ba0623fc19a424f4745394c499f9f28a8d88d397",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.12.101",
              "lessThan": "6.12.111",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "fs/afs/addr_list.c",
            "fs/afs/fs_probe.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/afs/addr_list.c",
            "fs/afs/fs_probe.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-25T11:17:09.127",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3afb988fd0411707bdafb9b321086fff0da28aae",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7f7f5589d048821dea316cbac9b37d27eaf7530e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ba0623fc19a424f4745394c499f9f28a8d88d397",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c7f77a11a1e719192c7262aad38a3919aec62c21",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Clear stale peer app data after address list changes\n\nafs_fs_probe_fileserver() fetches the current endpoint state under\nserver->fs_lock, but leaves old_alist as NULL.  Consequently,\nafs_set_peer_appdata() treats every address list replacement as initial\nsetup and only binds the new peers; it never unbinds peers removed from\nthe old list.\n\nAn address refresh can therefore proceed as follows.  CPU 0 replaces\nserver S's list and drops Pold without clearing Pold->app_data.  The\nserver destroyer then clears only S's current peers and lets S reach its\nRCU callback.  After the callback frees S, CPU 1 handles a callback\nthrough an RxRPC connection that still pins Pold, reads Pold->app_data,\nand calls afs_use_server() on the freed object.\n\nKASAN reported:\n\n  BUG: KASAN: slab-use-after-free in afs_find_server+0x3c/0xa0\n  Read of size 4 at addr ffff8881013e1af0 by task krxrpcio/7001/74\n  Call Trace:\n   afs_find_server+0x3c/0xa0\n   afs_rx_new_call+0x15c/0x390\n   rxrpc_new_incoming_call+0x97c/0x1730\n   rxrpc_input_packet.constprop.0+0xd03/0xec0\n   rxrpc_io_thread+0x967/0x1640\n  Allocated by task 93:\n   afs_lookup_server+0x1a7/0x14c0\n   afs_alloc_server_list+0x43f/0xb60\n   afs_create_volume+0x923/0x1490\n   afs_get_tree+0x1c6/0x10a0\n  Freed by task 0:\n   kfree+0x131/0x3c0\n   rcu_core+0x50a/0x1850\n  Last potentially related work creation:\n   __call_rcu_common.constprop.0+0x71/0xa10\n   afs_put_server+0x213/0x2b0\n\nPreserve old->addresses for the peer app-data update so that removed\npeers are cleared before the endpoint state is replaced.  Also advance\nboth cursors when the old and new lists share a peer; activating the\nold/new comparison without this would otherwise loop forever on the\nshared entry."
    }
  ],
  "lastModified": "2026-09-25T15:18:00.290",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}