CVE-2026-23472 (GCVE-0-2026-23472)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-10-30 12:24
VLAI
Title
serial: core: fix infinite loop in handle_tx() for PORT_UNKNOWN
Summary
In the Linux kernel, the following vulnerability has been resolved: serial: core: fix infinite loop in handle_tx() for PORT_UNKNOWN uart_write_room() and uart_write() behave inconsistently when xmit_buf is NULL (which happens for PORT_UNKNOWN ports that were never properly initialized): - uart_write_room() returns kfifo_avail() which can be > 0 - uart_write() checks xmit_buf and returns 0 if NULL This inconsistency causes an infinite loop in drivers that rely on tty_write_room() to determine if they can write: while (tty_write_room(tty) > 0) { written = tty->ops->write(...); // written is always 0, loop never exits } For example, caif_serial's handle_tx() enters an infinite loop when used with PORT_UNKNOWN serial ports, causing system hangs. Fix by making uart_write_room() also check xmit_buf and return 0 if it's NULL, consistent with uart_write(). Reproducer: https://gist.github.com/mrpre/d9a694cc0e19828ee3bc3b37983fde13
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 91c2a5d201daf66fa3f42b8a383bb89174bde2c8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c9e845014723d552944cec4e146ec7b841cda34d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d45cfa70bf0159afb31cb03d2d16ec5a5053460c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < efe85a557186b7fe915572ae93a8f3f78bfd9a22 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < bc70f2b36cf474d5cc8ecbcaf57f3e326fdec67c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 455ce986fa356ff43a43c0d363ba95fa152f21d5 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: core: fix infinite loop in handle_tx() for PORT_UNKNOWN\n\nuart_write_room() and uart_write() behave inconsistently when\nxmit_buf is NULL (which happens for PORT_UNKNOWN ports that were\nnever properly initialized):\n\n- uart_write_room() returns kfifo_avail() which can be \u003e 0\n- uart_write() checks xmit_buf and returns 0 if NULL\n\nThis inconsistency causes an infinite loop in drivers that rely on\ntty_write_room() to determine if they can write:\n\n  while (tty_write_room(tty) \u003e 0) {\n      written = tty-\u003eops-\u003ewrite(...);\n      // written is always 0, loop never exits\n  }\n\nFor example, caif_serial\u0027s handle_tx() enters an infinite loop when\nused with PORT_UNKNOWN serial ports, causing system hangs.\n\nFix by making uart_write_room() also check xmit_buf and return 0 if\nit\u0027s NULL, consistent with uart_write().\n\nReproducer: https://gist.github.com/mrpre/d9a694cc0e19828ee3bc3b37983fde13"
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nserial: core: correcci\u00f3n de bucle infinito en handle_tx() para PORT_UNKNOWN\n\nuart_write_room() y uart_write() se comportan de forma inconsistente cuando xmit_buf es NULL (lo cual ocurre para puertos PORT_UNKNOWN que nunca fueron inicializados correctamente):\n\n- uart_write_room() devuelve kfifo_avail() que puede ser \u003e 0\n- uart_write() comprueba xmit_buf y devuelve 0 si es NULL\n\nEsta inconsistencia causa un bucle infinito en controladores que dependen de tty_write_room() para determinar si pueden escribir:\n\n  while (tty_write_room(tty) \u003e 0) {\n      written = tty-\u003eops-\u003ewrite(...);\n      // written es siempre 0, el bucle nunca sale\n  }\n\nPor ejemplo, el handle_tx() de caif_serial entra en un bucle infinito cuando se usa con puertos serie PORT_UNKNOWN, causando cuelgues del sistema.\n\nSoluci\u00f3n al hacer que uart_write_room() tambi\u00e9n compruebe xmit_buf y devuelva 0 si es NULL, consistente con uart_write().\n\nReproductor: https://gist.github.com/mrpre/d9a694cc0e19828ee3bc3b37983fde13"
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        "id": "CVE-2026-23472",
        "lastModified": "2026-10-30T13:18:38.927",
        "metrics": {
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                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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                "version": "3.1"
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              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
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        "published": "2026-04-03T16:16:34.977",
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              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/efe85a557186b7fe915572ae93a8f3f78bfd9a22"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-835"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:21:10+00:00",
      "cve": "CVE-2026-23472",
      "id": "CVE-2026-23472",
      "initial_release_date": "2026-04-03T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: serial: core: fix infinite loop in handle_tx() for PORT_UNKNOWN",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23472.json",
      "version": "3"
    }
  }
}



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