fkie_cve-2022-48985
Vulnerability from fkie_nvd
Published
2024-10-21 20:15
Modified
2024-11-07 19:35
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: mana: Fix race on per-CQ variable napi work_done After calling napi_complete_done(), the NAPIF_STATE_SCHED bit may be cleared, and another CPU can start napi thread and access per-CQ variable, cq->work_done. If the other thread (for example, from busy_poll) sets it to a value >= budget, this thread will continue to run when it should stop, and cause memory corruption and panic. To fix this issue, save the per-CQ work_done variable in a local variable before napi_complete_done(), so it won't be corrupted by a possible concurrent thread after napi_complete_done(). Also, add a flag bit to advertise to the NIC firmware: the NAPI work_done variable race is fixed, so the driver is able to reliably support features like busy_poll.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18010ff776fa42340efc428b3ea6d19b3e7c7b21Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6740d8572ccd1bca50d8a1ca2bedc333f50ed5f3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fe50a9bbeb1f042e756c5cfa7708112c944368dePatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1


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   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: Fix race on per-CQ variable napi work_done\n\nAfter calling napi_complete_done(), the NAPIF_STATE_SCHED bit may be\ncleared, and another CPU can start napi thread and access per-CQ variable,\ncq->work_done. If the other thread (for example, from busy_poll) sets\nit to a value >= budget, this thread will continue to run when it should\nstop, and cause memory corruption and panic.\n\nTo fix this issue, save the per-CQ work_done variable in a local variable\nbefore napi_complete_done(), so it won't be corrupted by a possible\nconcurrent thread after napi_complete_done().\n\nAlso, add a flag bit to advertise to the NIC firmware: the NAPI work_done\nvariable race is fixed, so the driver is able to reliably support features\nlike busy_poll.",
      },
      {
         lang: "es",
         value: "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: mana: Corregir ejecución en la variable per-CQ napi work_done Después de llamar a napi_complete_done(), el bit NAPIF_STATE_SCHED puede borrarse, y otra CPU puede iniciar el hilo napi y acceder a la variable per-CQ, cq->work_done. Si el otro hilo (por ejemplo, desde busy_poll) lo establece en un valor >= budget, este hilo seguirá ejecutándose cuando debería detenerse, y provocará corrupción de memoria y pánico. Para solucionar este problema, guarde la variable per-CQ work_done en una variable local antes de napi_complete_done(), para que no se corrompa por un posible hilo concurrente después de napi_complete_done(). Además, agregue un bit de bandera para anunciar al firmware NIC: la ejecución de la variable NAPI work_done está fija, por lo que el controlador puede soportar de forma fiable funciones como busy_poll.",
      },
   ],
   id: "CVE-2022-48985",
   lastModified: "2024-11-07T19:35:06.407",
   metrics: {
      cvssMetricV31: [
         {
            cvssData: {
               attackComplexity: "HIGH",
               attackVector: "LOCAL",
               availabilityImpact: "HIGH",
               baseScore: 4.7,
               baseSeverity: "MEDIUM",
               confidentialityImpact: "NONE",
               integrityImpact: "NONE",
               privilegesRequired: "LOW",
               scope: "UNCHANGED",
               userInteraction: "NONE",
               vectorString: "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
               version: "3.1",
            },
            exploitabilityScore: 1,
            impactScore: 3.6,
            source: "nvd@nist.gov",
            type: "Primary",
         },
      ],
   },
   published: "2024-10-21T20:15:10.463",
   references: [
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Analyzed",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "NVD-CWE-noinfo",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
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}


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