Vulnerability-Lookup

CVE-2023-54112 (GCVE-0-2023-54112)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:06 – Updated: 2026-05-11 19:55

Title

kcm: Fix memory leak in error path of kcm_sendmsg()

Summary

In the Linux kernel, the following vulnerability has been resolved: kcm: Fix memory leak in error path of kcm_sendmsg() syzbot reported a memory leak like below: BUG: memory leak unreferenced object 0xffff88810b088c00 (size 240): comm "syz-executor186", pid 5012, jiffies 4294943306 (age 13.680s) hex dump (first 32 bytes): 00 89 08 0b 81 88 ff ff 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff83e5d5ff>] __alloc_skb+0x1ef/0x230 net/core/skbuff.c:634 [<ffffffff84606e59>] alloc_skb include/linux/skbuff.h:1289 [inline] [<ffffffff84606e59>] kcm_sendmsg+0x269/0x1050 net/kcm/kcmsock.c:815 [<ffffffff83e479c6>] sock_sendmsg_nosec net/socket.c:725 [inline] [<ffffffff83e479c6>] sock_sendmsg+0x56/0xb0 net/socket.c:748 [<ffffffff83e47f55>] ____sys_sendmsg+0x365/0x470 net/socket.c:2494 [<ffffffff83e4c389>] ___sys_sendmsg+0xc9/0x130 net/socket.c:2548 [<ffffffff83e4c536>] __sys_sendmsg+0xa6/0x120 net/socket.c:2577 [<ffffffff84ad7bb8>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff84ad7bb8>] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd In kcm_sendmsg(), kcm_tx_msg(head)->last_skb is used as a cursor to append newly allocated skbs to 'head'. If some bytes are copied, an error occurred, and jumped to out_error label, 'last_skb' is left unmodified. A later kcm_sendmsg() will use an obsoleted 'last_skb' reference, corrupting the 'head' frag_list and causing the leak. This patch fixes this issue by properly updating the last allocated skb in 'last_skb'.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/8dc7eb757b1652b82…
https://git.kernel.org/stable/c/5e5554389397e98fa…
https://git.kernel.org/stable/c/479c71cda14b3c3a6…
https://git.kernel.org/stable/c/33db24ad811b3576a…
https://git.kernel.org/stable/c/97275339c34cfbccd…
https://git.kernel.org/stable/c/16989de75497574b5…
https://git.kernel.org/stable/c/af8085e0fc3207ecb…
https://git.kernel.org/stable/c/c821a88bd720b0046…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 8dc7eb757b1652b82725f32e0c89a1e9f6c0e13b (git) Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 5e5554389397e98fafb9efe395d8b4830dd5f042 (git) Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 479c71cda14b3c3a6515773faa39055333eaa2b7 (git) Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 33db24ad811b3576a0c2f8862506763f2be925b0 (git) Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 97275339c34cfbccd65e87bc38fd910ae66c48ba (git) Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 16989de75497574b5fafd174c0c233d5a86858b7 (git) Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < af8085e0fc3207ecbf8b9e7a635c790e36d058c6 (git) Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < c821a88bd720b0046433173185fd841a100d44ad (git)	guessed
Linux	Linux	Affected: 4.6 Unaffected: 0 , < 4.6 (semver) Unaffected: 4.14.326 , ≤ 4.14.* (semver) Unaffected: 4.19.295 , ≤ 4.19.* (semver) Unaffected: 5.4.257 , ≤ 5.4.* (semver) Unaffected: 5.10.195 , ≤ 5.10.* (semver) Unaffected: 5.15.132 , ≤ 5.15.* (semver) Unaffected: 6.1.54 , ≤ 6.1.* (semver) Unaffected: 6.5.4 , ≤ 6.5.* (semver) Unaffected: 6.6 , ≤ * (original_commit_for_fix)	guessed

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          "programFiles": [
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            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.326",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.295",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.257",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.195",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.132",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.5.*",
              "status": "unaffected",
              "version": "6.5.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "versionStartIncluding": "4.6",
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                {
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                {
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.5.4",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkcm: Fix memory leak in error path of kcm_sendmsg()\n\nsyzbot reported a memory leak like below:\n\nBUG: memory leak\nunreferenced object 0xffff88810b088c00 (size 240):\n  comm \"syz-executor186\", pid 5012, jiffies 4294943306 (age 13.680s)\n  hex dump (first 32 bytes):\n    00 89 08 0b 81 88 ff ff 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [\u003cffffffff83e5d5ff\u003e] __alloc_skb+0x1ef/0x230 net/core/skbuff.c:634\n    [\u003cffffffff84606e59\u003e] alloc_skb include/linux/skbuff.h:1289 [inline]\n    [\u003cffffffff84606e59\u003e] kcm_sendmsg+0x269/0x1050 net/kcm/kcmsock.c:815\n    [\u003cffffffff83e479c6\u003e] sock_sendmsg_nosec net/socket.c:725 [inline]\n    [\u003cffffffff83e479c6\u003e] sock_sendmsg+0x56/0xb0 net/socket.c:748\n    [\u003cffffffff83e47f55\u003e] ____sys_sendmsg+0x365/0x470 net/socket.c:2494\n    [\u003cffffffff83e4c389\u003e] ___sys_sendmsg+0xc9/0x130 net/socket.c:2548\n    [\u003cffffffff83e4c536\u003e] __sys_sendmsg+0xa6/0x120 net/socket.c:2577\n    [\u003cffffffff84ad7bb8\u003e] do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n    [\u003cffffffff84ad7bb8\u003e] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80\n    [\u003cffffffff84c0008b\u003e] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nIn kcm_sendmsg(), kcm_tx_msg(head)-\u003elast_skb is used as a cursor to append\nnewly allocated skbs to \u0027head\u0027. If some bytes are copied, an error occurred,\nand jumped to out_error label, \u0027last_skb\u0027 is left unmodified. A later\nkcm_sendmsg() will use an obsoleted \u0027last_skb\u0027 reference, corrupting the\n\u0027head\u0027 frag_list and causing the leak.\n\nThis patch fixes this issue by properly updating the last allocated skb in\n\u0027last_skb\u0027."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:55:42.470Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8dc7eb757b1652b82725f32e0c89a1e9f6c0e13b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e5554389397e98fafb9efe395d8b4830dd5f042"
        },
        {
          "url": "https://git.kernel.org/stable/c/479c71cda14b3c3a6515773faa39055333eaa2b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/33db24ad811b3576a0c2f8862506763f2be925b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/97275339c34cfbccd65e87bc38fd910ae66c48ba"
        },
        {
          "url": "https://git.kernel.org/stable/c/16989de75497574b5fafd174c0c233d5a86858b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/af8085e0fc3207ecbf8b9e7a635c790e36d058c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/c821a88bd720b0046433173185fd841a100d44ad"
        }
      ],
      "title": "kcm: Fix memory leak in error path of kcm_sendmsg()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54112",
    "datePublished": "2025-12-24T13:06:34.854Z",
    "dateReserved": "2025-12-24T13:02:52.518Z",
    "dateUpdated": "2026-05-11T19:55:42.470Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-54112",
      "date": "2026-09-15",
      "epss": "0.00205",
      "percentile": "0.10704"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-54112\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:13.103\",\"lastModified\":\"2026-06-17T06:46:49.353\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nkcm: Fix memory leak in error path of kcm_sendmsg()\\n\\nsyzbot reported a memory leak like below:\\n\\nBUG: memory leak\\nunreferenced object 0xffff88810b088c00 (size 240):\\n  comm \\\"syz-executor186\\\", pid 5012, jiffies 4294943306 (age 13.680s)\\n  hex dump (first 32 bytes):\\n    00 89 08 0b 81 88 ff ff 00 00 00 00 00 00 00 00  ................\\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n  backtrace:\\n    [\u003cffffffff83e5d5ff\u003e] __alloc_skb+0x1ef/0x230 net/core/skbuff.c:634\\n    [\u003cffffffff84606e59\u003e] alloc_skb include/linux/skbuff.h:1289 [inline]\\n    [\u003cffffffff84606e59\u003e] kcm_sendmsg+0x269/0x1050 net/kcm/kcmsock.c:815\\n    [\u003cffffffff83e479c6\u003e] sock_sendmsg_nosec net/socket.c:725 [inline]\\n    [\u003cffffffff83e479c6\u003e] sock_sendmsg+0x56/0xb0 net/socket.c:748\\n    [\u003cffffffff83e47f55\u003e] ____sys_sendmsg+0x365/0x470 net/socket.c:2494\\n    [\u003cffffffff83e4c389\u003e] ___sys_sendmsg+0xc9/0x130 net/socket.c:2548\\n    [\u003cffffffff83e4c536\u003e] __sys_sendmsg+0xa6/0x120 net/socket.c:2577\\n    [\u003cffffffff84ad7bb8\u003e] do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n    [\u003cffffffff84ad7bb8\u003e] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80\\n    [\u003cffffffff84c0008b\u003e] entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nIn kcm_sendmsg(), kcm_tx_msg(head)-\u003elast_skb is used as a cursor to append\\nnewly allocated skbs to \u0027head\u0027. If some bytes are copied, an error occurred,\\nand jumped to out_error label, \u0027last_skb\u0027 is left unmodified. A later\\nkcm_sendmsg() will use an obsoleted \u0027last_skb\u0027 reference, corrupting the\\n\u0027head\u0027 frag_list and causing the leak.\\n\\nThis patch fixes this issue by properly updating the last allocated skb in\\n\u0027last_skb\u0027.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/kcm/kcmsock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\"lessThan\":\"8dc7eb757b1652b82725f32e0c89a1e9f6c0e13b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\"lessThan\":\"5e5554389397e98fafb9efe395d8b4830dd5f042\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\"lessThan\":\"479c71cda14b3c3a6515773faa39055333eaa2b7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\"lessThan\":\"33db24ad811b3576a0c2f8862506763f2be925b0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\"lessThan\":\"97275339c34cfbccd65e87bc38fd910ae66c48ba\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\"lessThan\":\"16989de75497574b5fafd174c0c233d5a86858b7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\"lessThan\":\"af8085e0fc3207ecbf8b9e7a635c790e36d058c6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\"lessThan\":\"c821a88bd720b0046433173185fd841a100d44ad\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/kcm/kcmsock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.326\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.295\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.257\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.195\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.132\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.54\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.5.4\",\"lessThanOrEqual\":\"6.5.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/16989de75497574b5fafd174c0c233d5a86858b7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/33db24ad811b3576a0c2f8862506763f2be925b0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/479c71cda14b3c3a6515773faa39055333eaa2b7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5e5554389397e98fafb9efe395d8b4830dd5f042\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8dc7eb757b1652b82725f32e0c89a1e9f6c0e13b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/97275339c34cfbccd65e87bc38fd910ae66c48ba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/af8085e0fc3207ecbf8b9e7a635c790e36d058c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c821a88bd720b0046433173185fd841a100d44ad\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:33:04+00:00",
      "cve": "CVE-2023-54112",
      "id": "CVE-2023-54112",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kcm: Fix memory leak in error path of kcm_sendmsg()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54112.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-07T16:43:40Z",
      "cve": "CVE-2023-54112",
      "id": "CVE-2023-54112",
      "initial_release_date": "2025-12-25T00:55:21Z",
      "product_status:known_affected": "688",
      "product_status:known_not_affected": "105",
      "product_status:recommended": "235",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-54112",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-54112.json",
      "version": "35"
    }
  }
}

WID-SEC-W-2025-2929

Vulnerability from csaf_certbund - Published: 2025-12-28 23:00 - Updated: 2026-06-04 22:00

Summary

Linux Kernel: Mehrere Schwachstellen

Severity

Hoch

Scope

207 vulnerabilities in this advisory, including CVE-2023-54112.

CVE-2023-54112

Known affected: 9 products

Open the full advisory

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2023-54112 (GCVE-0-2023-54112)

WID-SEC-W-2025-2929

Tags

Sightings

Nomenclature