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CVE-2026-74719

Estado: RecibidaSin puntuar—

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

net/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()

The SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT branch in smc_llc_event_handler() stores an incoming qentry into the local LLC flow without first checking whether a qentry is already pending. If a malicious or buggy peer sends a second CONFIRM_LINK or ADD_LINK_CONT request while a flow is active and flow->qentry is already set, smc_llc_flow_qentry_set() overwrites the pointer without freeing the previous allocation, leaking one kmalloc-96 object per spurious message.

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The sibling SMC_LLC_DELETE_LINK branch already has the correct !flow->qentry guard. Apply the same guard to the CONFIRM_LINK/ADD_LINK_CONT branch so that a duplicate message when qentry is already occupied falls through to break and is freed by the kfree(qentry) at the out: label, rather than silently leaking the existing allocation.

The response direction (smc_llc_rx_response()) is unaffected: it already guards with flow->qentry at the equivalent site and drops duplicate responses correctly.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

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).

Tecnologías afectadas (1)

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

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-74719",
  "cveTags": [],
  "metrics": {},
  "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": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "lessThan": "e384f3cba6ea709f5b2272b1770db4ce14047f78",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "lessThan": "a1e980d7a9e7ee6faf4f5fd7b450413b969af26d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "lessThan": "e0eb87677c76b157cdf8eb7c1f19e56227165a33",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "lessThan": "06734dfeaeba886aab1bf147249195b888ac3e4d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "lessThan": "c23c409228629107203d3c3e95fff1473173f1a6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "lessThan": "10cb31b2b74cb664c6c95cf72364d7d5c483ab82",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "lessThan": "bfc336a9fbbf09805f3dfe25c195a4db90af2846",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "lessThan": "976245094925bab9bc39366b2e9ab44ffcde61d0",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/smc/smc_llc.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.8",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/smc/smc_llc.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-22T16:16:46.830",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/06734dfeaeba886aab1bf147249195b888ac3e4d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/10cb31b2b74cb664c6c95cf72364d7d5c483ab82",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/976245094925bab9bc39366b2e9ab44ffcde61d0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a1e980d7a9e7ee6faf4f5fd7b450413b969af26d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bfc336a9fbbf09805f3dfe25c195a4db90af2846",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c23c409228629107203d3c3e95fff1473173f1a6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e0eb87677c76b157cdf8eb7c1f19e56227165a33",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e384f3cba6ea709f5b2272b1770db4ce14047f78",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()\n\nThe SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT branch in\nsmc_llc_event_handler() stores an incoming qentry into the local LLC flow\nwithout first checking whether a qentry is already pending. If a malicious or\nbuggy peer sends a second CONFIRM_LINK or ADD_LINK_CONT request while a flow is\nactive and flow->qentry is already set, smc_llc_flow_qentry_set() overwrites the\npointer without freeing the previous allocation, leaking one kmalloc-96 object\nper spurious message.\n\nThe sibling SMC_LLC_DELETE_LINK branch already has the correct !flow->qentry\nguard. Apply the same guard to the CONFIRM_LINK/ADD_LINK_CONT branch so that a\nduplicate message when qentry is already occupied falls through to break and is\nfreed by the kfree(qentry) at the out: label, rather than silently leaking the\nexisting allocation.\n\nThe response direction (smc_llc_rx_response()) is unaffected: it already guards\nwith flow->qentry at the equivalent site and drops duplicate responses\ncorrectly."
    }
  ],
  "lastModified": "2026-08-22T16:16:46.830",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}