CVE-2023-53751 (GCVE-0-2023-53751)

Vulnerability from cvelistv5 – Published: 2025-12-08 01:19 – Updated: 2026-08-05 09:15
VLAI
Title
cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname TCP_Server_Info::hostname may be updated once or many times during reconnect, so protect its access outside reconnect path as well and then prevent any potential use-after-free bugs.
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: 93d5cb517db39e8af8d1292f9e785e4983b7f708 , < 64d62ac6d6514cba1305bd08e271ec1843bdd612 (git)
Affected: 93d5cb517db39e8af8d1292f9e785e4983b7f708 , < c511954bf142fe1995aec3c739a9f1a76990283a (git)
Affected: 93d5cb517db39e8af8d1292f9e785e4983b7f708 , < 0b08c4c499200be67d54c439d56e5ea866869945 (git)
Affected: 93d5cb517db39e8af8d1292f9e785e4983b7f708 , < 90c49fce1c43e1cc152695e20363ff5087897c09 (git)
Create a notification for this product.
Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 6.1.28 , ≤ 6.1.* (semver)
Unaffected: 6.2.15 , ≤ 6.2.* (semver)
Unaffected: 6.3.2 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/cifs/cifs_debug.c",
            "fs/cifs/cifs_debug.h",
            "fs/cifs/connect.c",
            "fs/cifs/sess.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "64d62ac6d6514cba1305bd08e271ec1843bdd612",
              "status": "affected",
              "version": "93d5cb517db39e8af8d1292f9e785e4983b7f708",
              "versionType": "git"
            },
            {
              "lessThan": "c511954bf142fe1995aec3c739a9f1a76990283a",
              "status": "affected",
              "version": "93d5cb517db39e8af8d1292f9e785e4983b7f708",
              "versionType": "git"
            },
            {
              "lessThan": "0b08c4c499200be67d54c439d56e5ea866869945",
              "status": "affected",
              "version": "93d5cb517db39e8af8d1292f9e785e4983b7f708",
              "versionType": "git"
            },
            {
              "lessThan": "90c49fce1c43e1cc152695e20363ff5087897c09",
              "status": "affected",
              "version": "93d5cb517db39e8af8d1292f9e785e4983b7f708",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/cifs/cifs_debug.c",
            "fs/cifs/cifs_debug.h",
            "fs/cifs/connect.c",
            "fs/cifs/sess.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "lessThan": "5.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.28",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.15",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.28",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.15",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3.2",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix potential use-after-free bugs in TCP_Server_Info::hostname\n\nTCP_Server_Info::hostname may be updated once or many times during\nreconnect, so protect its access outside reconnect path as well and\nthen prevent any potential use-after-free bugs."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerability is in the CIFS/SMB client\u0027s handling of remote server data \u2014 the freed/reallocated `hostname` is derived from server-supplied DFS referral targets, and both the free side (forced reconnects) and the read side (error-path `cifs_server_dbg(VFS,...)` on malformed or bad-signature responses) are driven entirely by a remote SMB peer or an on-path network attacker.\nAC:L - The attacker controls both sides of the race: it can force unlimited reconnect cycles by dropping the TCP connection, chooses DFS target names so it controls the size and content of the freed/reallocated string for heap grooming, and can trigger the unlocked readers on demand via malformed responses, with unlimited retries.\nPR:N - No credentials or privileges on the target are required \u2014 the attacker is the remote SMB server or a network attacker, and the reader side is additionally reachable by any unprivileged local user through the world-readable (0444) /proc/fs/cifs/DebugData and 0644 /proc/fs/cifs/Stats.\nUI:N - Against a host with an already-established DFS CIFS mount (routine on enterprise servers and appliances), the attacker triggers reconnects and error paths on its own; no action by any user is needed at attack time.\nS:U - The use-after-free is in kernel memory and its impact stays within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `seq_printf(\"%s\", server-\u003ehostname)` on the dangling pointer copies freed heap memory into the world-readable /proc/fs/cifs/DebugData output, reading until an arbitrary NUL byte, giving an unbounded kernel heap disclosure whose contents the attacker can groom; the same data also leaks to dmesg via `cifs_server_dbg`.\nI:H - This is a use-after-free on an attacker-size-controlled slab object with a racing free/reassign of the same pointer, which enables heap spraying and reclaim of the freed slot; per kernel UAF scoring this is treated as exploitable for control-flow/memory corruption.\nA:H - Dereferencing the freed string over poisoned, unmapped, or reallocated memory produces a kernel oops/panic, and the attacker can repeat the reconnect-driven race indefinitely."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:15:47.928Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/64d62ac6d6514cba1305bd08e271ec1843bdd612"
        },
        {
          "url": "https://git.kernel.org/stable/c/c511954bf142fe1995aec3c739a9f1a76990283a"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b08c4c499200be67d54c439d56e5ea866869945"
        },
        {
          "url": "https://git.kernel.org/stable/c/90c49fce1c43e1cc152695e20363ff5087897c09"
        }
      ],
      "title": "cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53751",
    "datePublished": "2025-12-08T01:19:11.160Z",
    "dateReserved": "2025-12-08T01:18:04.279Z",
    "dateUpdated": "2026-08-05T09:15:47.928Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-53751",
      "date": "2026-08-05",
      "epss": "0.00405",
      "percentile": "0.33277"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53751\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-08T02:15:50.590\",\"lastModified\":\"2026-08-04T10:19:19.813\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncifs: fix potential use-after-free bugs in TCP_Server_Info::hostname\\n\\nTCP_Server_Info::hostname may be updated once or many times during\\nreconnect, so protect its access outside reconnect path as well and\\nthen prevent any potential use-after-free bugs.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/cifs/cifs_debug.c\",\"fs/cifs/cifs_debug.h\",\"fs/cifs/connect.c\",\"fs/cifs/sess.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"93d5cb517db39e8af8d1292f9e785e4983b7f708\",\"lessThan\":\"64d62ac6d6514cba1305bd08e271ec1843bdd612\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"93d5cb517db39e8af8d1292f9e785e4983b7f708\",\"lessThan\":\"c511954bf142fe1995aec3c739a9f1a76990283a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"93d5cb517db39e8af8d1292f9e785e4983b7f708\",\"lessThan\":\"0b08c4c499200be67d54c439d56e5ea866869945\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"93d5cb517db39e8af8d1292f9e785e4983b7f708\",\"lessThan\":\"90c49fce1c43e1cc152695e20363ff5087897c09\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/cifs/cifs_debug.c\",\"fs/cifs/cifs_debug.h\",\"fs/cifs/connect.c\",\"fs/cifs/sess.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\":\"6.1.28\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2.15\",\"lessThanOrEqual\":\"6.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3.2\",\"lessThanOrEqual\":\"6.3.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.4\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0b08c4c499200be67d54c439d56e5ea866869945\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/64d62ac6d6514cba1305bd08e271ec1843bdd612\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/90c49fce1c43e1cc152695e20363ff5087897c09\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c511954bf142fe1995aec3c739a9f1a76990283a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:15:01+00:00",
      "cve": "CVE-2023-53751",
      "id": "CVE-2023-53751",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "1057",
      "product_status:known_affected": "49",
      "product_status:known_not_affected": "107",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel (CIFS): Use-after-free vulnerability allows data integrity compromise and denial of service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53751.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-05T01:03:45Z",
      "cve": "CVE-2023-53751",
      "id": "CVE-2023-53751",
      "initial_release_date": "2025-12-09T00:29:18Z",
      "product_status:known_affected": "476",
      "product_status:known_not_affected": "184",
      "product_status:recommended": "268",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53751",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53751.json",
      "version": "31"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Loading…

Detection rules are retrieved from Rulezet.

Loading…

Loading…

Loading…