FKIE_CVE-2026-74719

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-22 16:16
Severity
Summary
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. 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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/06734dfeaeba886aab1bf147249195b888ac3e4d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/10cb31b2b74cb664c6c95cf72364d7d5c483ab82
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/976245094925bab9bc39366b2e9ab44ffcde61d0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a1e980d7a9e7ee6faf4f5fd7b450413b969af26d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bfc336a9fbbf09805f3dfe25c195a4db90af2846
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c23c409228629107203d3c3e95fff1473173f1a6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e0eb87677c76b157cdf8eb7c1f19e56227165a33
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e384f3cba6ea709f5b2272b1770db4ce14047f78
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/smc/smc_llc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e384f3cba6ea709f5b2272b1770db4ce14047f78",
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "versionType": "git"
            },
            {
              "lessThan": "a1e980d7a9e7ee6faf4f5fd7b450413b969af26d",
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "versionType": "git"
            },
            {
              "lessThan": "e0eb87677c76b157cdf8eb7c1f19e56227165a33",
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "versionType": "git"
            },
            {
              "lessThan": "06734dfeaeba886aab1bf147249195b888ac3e4d",
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "versionType": "git"
            },
            {
              "lessThan": "c23c409228629107203d3c3e95fff1473173f1a6",
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "versionType": "git"
            },
            {
              "lessThan": "10cb31b2b74cb664c6c95cf72364d7d5c483ab82",
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "versionType": "git"
            },
            {
              "lessThan": "bfc336a9fbbf09805f3dfe25c195a4db90af2846",
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "versionType": "git"
            },
            {
              "lessThan": "976245094925bab9bc39366b2e9ab44ffcde61d0",
              "status": "affected",
              "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/smc/smc_llc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "lessThan": "5.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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-\u003eqentry 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-\u003eqentry\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-\u003eqentry at the equivalent site and drops duplicate responses\ncorrectly."
    }
  ],
  "id": "CVE-2026-74719",
  "lastModified": "2026-08-22T16:16:46.830",
  "metrics": {},
  "published": "2026-08-22T16:16:46.830",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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