CVE-2024-26690

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: net: stmmac: protect updates of 64-bit statistics counters As explained by a comment in <linux/u64_stats_sync.h>, write side of struct u64_stats_sync must ensure mutual exclusion, or one seqcount update could be lost on 32-bit platforms, thus blocking readers forever. Such lockups have been observed in real world after stmmac_xmit() on one CPU raced with stmmac_napi_poll_tx() on another CPU. To fix the issue without introducing a new lock, split the statics into three parts: 1. fields updated only under the tx queue lock, 2. fields updated only during NAPI poll, 3. fields updated only from interrupt context, Updates to fields in the first two groups are already serialized through other locks. It is sufficient to split the existing struct u64_stats_sync so that each group has its own. Note that tx_set_ic_bit is updated from both contexts. Split this counter so that each context gets its own, and calculate their sum to get the total value in stmmac_get_ethtool_stats(). For the third group, multiple interrupts may be processed by different CPUs at the same time, but interrupts on the same CPU will not nest. Move fields from this group to a newly created per-cpu struct stmmac_pcpu_stats.

Severity

HIGH

CVSS score

7.5 (v3.1)

Vulnerability status

Modified

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2024-04-03 15:15:52.487000

Last modified

2026-10-30 13:17:21.400000

View original CVE JSON

{
  "id": "CVE-2024-26690",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-04-03T15:15:52.487",
  "lastModified": "2026-10-30T13:17:21.400",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: protect updates of 64-bit statistics counters\n\nAs explained by a comment in <linux/u64_stats_sync.h>, write side of struct\nu64_stats_sync must ensure mutual exclusion, or one seqcount update could\nbe lost on 32-bit platforms, thus blocking readers forever. Such lockups\nhave been observed in real world after stmmac_xmit() on one CPU raced with\nstmmac_napi_poll_tx() on another CPU.\n\nTo fix the issue without introducing a new lock, split the statics into\nthree parts:\n\n1. fields updated only under the tx queue lock,\n2. fields updated only during NAPI poll,\n3. fields updated only from interrupt context,\n\nUpdates to fields in the first two groups are already serialized through\nother locks. It is sufficient to split the existing struct u64_stats_sync\nso that each group has its own.\n\nNote that tx_set_ic_bit is updated from both contexts. Split this counter\nso that each context gets its own, and calculate their sum to get the total\nvalue in stmmac_get_ethtool_stats().\n\nFor the third group, multiple interrupts may be processed by different CPUs\nat the same time, but interrupts on the same CPU will not nest. Move fields\nfrom this group to a newly created per-cpu struct stmmac_pcpu_stats."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: stmmac: protege las actualizaciones de los contadores de estadísticas de 64 bits. Como se explica en un comentario en , el lado de escritura de la estructura u64_stats_sync debe garantizar la exclusión mutua, o uno La actualización de seqcount podría perderse en plataformas de 32 bits, bloqueando así a los lectores para siempre. Estos bloqueos se han observado en el mundo real después de que stmmac_xmit() en una CPU compitiera con stmmac_napi_poll_tx() en otra CPU. Para solucionar el problema sin introducir un nuevo bloqueo, divida la estática en tres partes: 1. campos actualizados solo bajo el bloqueo de la cola de transmisión, 2. campos actualizados solo durante la encuesta NAPI, 3. campos actualizados solo desde el contexto de interrupción, Actualizaciones de los campos en los dos primeros grupos ya están serializados a través de otras cerraduras. Basta con dividir la estructura existente u64_stats_sync para que cada grupo tenga el suyo propio. Tenga en cuenta que tx_set_ic_bit se actualiza desde ambos contextos. Divida este contador para que cada contexto tenga el suyo y calcule su suma para obtener el valor total en stmmac_get_ethtool_stats(). Para el tercer grupo, diferentes CPU pueden procesar múltiples interrupciones al mismo tiempo, pero las interrupciones en la misma CPU no se anidarán. Mueva los campos de este grupo a una estructura por CPU stmmac_pcpu_stats recién creada."
    }
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            "drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c",
            "drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c",
            "drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c",
            "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c"
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            "drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c",
            "drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c",
            "drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c",
            "drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c",
            "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c"
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              "versionType": "original_commit_for_fix",
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          "privilegesRequired": "NONE",
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          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
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          "role": "CISA Coordinator",
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  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
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