CVE-2026-74386

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: fix page fragment cache leak in error path In nvmet_tcp_alloc_queue(), when a connection is closed during the allocation process (e.g., nvmet_tcp_set_queue_sock() returns -ENOTCONN), the error handling jumps to out_destroy_sq and then to out_ida_remove without draining the page fragment cache. Although nvmet_tcp_free_cmd() is called in some error paths to release individual page fragments, the underlying page cache reference held by queue->pf_cache is never released. The first allocation using pf_cache is the call to nvmet_tcp_alloc_cmd() for queue->connect, which happens after ida_alloc() returns successfully. This results in a page leak each time a connection fails during allocation, which could lead to memory exhaustion over time if connections are repeatedly opened and closed. Fix this by calling page_frag_cache_drain() before freeing the queue structure in the out_ida_remove label.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

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

Published

2026-08-15 06:22:40.513000

Last modified

2026-10-30 13:19:56.223000

View original CVE JSON

{
  "id": "CVE-2026-74386",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-08-15T06:22:40.513",
  "lastModified": "2026-10-30T13:19:56.223",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-tcp: fix page fragment cache leak in error path\n\nIn nvmet_tcp_alloc_queue(), when a connection is closed during the\nallocation process (e.g., nvmet_tcp_set_queue_sock() returns -ENOTCONN),\nthe error handling jumps to out_destroy_sq and then to out_ida_remove\nwithout draining the page fragment cache.\n\nAlthough nvmet_tcp_free_cmd() is called in some error paths to release\nindividual page fragments, the underlying page cache reference held by\nqueue->pf_cache is never released. The first allocation using pf_cache\nis the call to nvmet_tcp_alloc_cmd() for queue->connect, which happens\nafter ida_alloc() returns successfully. This results in a page leak each\ntime a connection fails during allocation, which could lead to memory\nexhaustion over time if connections are repeatedly opened and closed.\n\nFix this by calling page_frag_cache_drain() before freeing the queue\nstructure in the out_ida_remove label."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/nvme/target/tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
              "lessThan": "aadb8eb9006e192c51b499860f40765de7d55680",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
              "lessThan": "fc11e3f0daaadb6e600a86e54b089d4662d0a464",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
              "lessThan": "a43a9abc1ebf663f0aa56a729106f68dd9c77da6",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
              "lessThan": "ba3209704b3cd46961e4e081af5c52a780785648",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
              "lessThan": "5fbe83a374f09561a0f0c1f4aa021501ffd681eb",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
              "lessThan": "4dae393956093c807212918fd91a8fc70df15338",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/nvme/target/tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.0",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.0",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.160",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.97",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.40",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.5",
              "lessThanOrEqual": "7.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4dae393956093c807212918fd91a8fc70df15338",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5fbe83a374f09561a0f0c1f4aa021501ffd681eb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a43a9abc1ebf663f0aa56a729106f68dd9c77da6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/aadb8eb9006e192c51b499860f40765de7d55680",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ba3209704b3cd46961e4e081af5c52a780785648",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fc11e3f0daaadb6e600a86e54b089d4662d0a464",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}