FKIE_CVE-2025-71149

Vulnerability from fkie_nvd - Published: 2026-01-23 15:16 - Updated: 2026-02-26 20:28
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring/poll: correctly handle io_poll_add() return value on update When the core of io_uring was updated to handle completions consistently and with fixed return codes, the POLL_REMOVE opcode with updates got slightly broken. If a POLL_ADD is pending and then POLL_REMOVE is used to update the events of that request, if that update causes the POLL_ADD to now trigger, then that completion is lost and a CQE is never posted. Additionally, ensure that if an update does cause an existing POLL_ADD to complete, that the completion value isn't always overwritten with -ECANCELED. For that case, whatever io_poll_add() set the value to should just be retained.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0126560370ed5217958b85657b590ad25e8b9c00Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/13a8f7b88c2d40c6b33f6216190478dda95d385fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84230ad2d2afbf0c44c32967e525c0ad92e26b4ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8b777ab48441b153502772ecfc78c107d4353f29Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c1669c03bfbc2a9b5ebff4428eecebe734c646fePatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/poll: correctly handle io_poll_add() return value on update\n\nWhen the core of io_uring was updated to handle completions\nconsistently and with fixed return codes, the POLL_REMOVE opcode\nwith updates got slightly broken. If a POLL_ADD is pending and\nthen POLL_REMOVE is used to update the events of that request, if that\nupdate causes the POLL_ADD to now trigger, then that completion is lost\nand a CQE is never posted.\n\nAdditionally, ensure that if an update does cause an existing POLL_ADD\nto complete, that the completion value isn\u0027t always overwritten with\n-ECANCELED. For that case, whatever io_poll_add() set the value to\nshould just be retained."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nio_uring/poll: manejar correctamente el valor de retorno de io_poll_add() en la actualizaci\u00f3n\n\nCuando el n\u00facleo de io_uring fue actualizado para manejar las finalizaciones de manera consistente y con c\u00f3digos de retorno fijos, el c\u00f3digo de operaci\u00f3n POLL_REMOVE con actualizaciones se rompi\u00f3 ligeramente. Si un POLL_ADD est\u00e1 pendiente y luego se usa POLL_REMOVE para actualizar los eventos de esa solicitud, si esa actualizaci\u00f3n hace que el POLL_ADD se active ahora, entonces esa finalizaci\u00f3n se pierde y nunca se publica un CQE.\n\nAdem\u00e1s, aseg\u00farese de que si una actualizaci\u00f3n causa que un POLL_ADD existente se complete, que el valor de finalizaci\u00f3n no siempre sea sobrescrito con -ECANCELED. Para ese caso, lo que sea que io_poll_add() haya establecido el valor deber\u00eda simplemente ser retenido."
    }
  ],
  "id": "CVE-2025-71149",
  "lastModified": "2026-02-26T20:28:14.930",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "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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  "published": "2026-01-23T15:16:05.630",
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  "vulnStatus": "Analyzed",
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}


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