CVE-2025-39873 (GCVE-0-2025-39873)

Vulnerability from cvelistv5 – Published: 2025-09-23 06:00 – Updated: 2026-08-05 12:05
VLAI
Title
can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB
Summary
In the Linux kernel, the following vulnerability has been resolved: can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB can_put_echo_skb() takes ownership of the SKB and it may be freed during or after the call. However, xilinx_can xcan_write_frame() keeps using SKB after the call. Fix that by only calling can_put_echo_skb() after the code is done touching the SKB. The tx_lock is held for the entire xcan_write_frame() execution and also on the can_get_echo_skb() side so the order of operations does not matter. An earlier fix commit 3d3c817c3a40 ("can: xilinx_can: Fix usage of skb memory") did not move the can_put_echo_skb() call far enough. [mkl: add "commit" in front of sha1 in patch description] [mkl: fix indention]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1598efe57b3e768056e4ca56cb9cf33111e68d1c , < e202ffd9e54538ef67ec301ebd6d9da4823466c9 (git)
Affected: 1598efe57b3e768056e4ca56cb9cf33111e68d1c , < 1139321161a3ba5e45e61e0738b37f42f20bc57a (git)
Affected: 1598efe57b3e768056e4ca56cb9cf33111e68d1c , < 94b050726288a56a6b8ff55aa641f2fedbd3b44c (git)
Affected: 1598efe57b3e768056e4ca56cb9cf33111e68d1c , < 725b33deebd6e4c96fe7893f384510a54258f28f (git)
Affected: 1598efe57b3e768056e4ca56cb9cf33111e68d1c , < 668cc1e3bb21101d074e430de1b7ba8fd10189e7 (git)
Affected: 1598efe57b3e768056e4ca56cb9cf33111e68d1c , < ef79f00be72bd81d2e1e6f060d83cf7e425deee4 (git)
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Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.15.194 , ≤ 5.15.* (semver)
Unaffected: 6.1.153 , ≤ 6.1.* (semver)
Unaffected: 6.6.107 , ≤ 6.6.* (semver)
Unaffected: 6.12.48 , ≤ 6.12.* (semver)
Unaffected: 6.16.8 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB\n\ncan_put_echo_skb() takes ownership of the SKB and it may be freed\nduring or after the call.\n\nHowever, xilinx_can xcan_write_frame() keeps using SKB after the call.\n\nFix that by only calling can_put_echo_skb() after the code is done\ntouching the SKB.\n\nThe tx_lock is held for the entire xcan_write_frame() execution and\nalso on the can_get_echo_skb() side so the order of operations does not\nmatter.\n\nAn earlier fix commit 3d3c817c3a40 (\"can: xilinx_can: Fix usage of skb\nmemory\") did not move the can_put_echo_skb() call far enough.\n\n[mkl: add \"commit\" in front of sha1 in patch description]\n[mkl: fix indention]"
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncan: xilinx_can: xcan_write_frame(): corregir uso despu\u00e9s de liberaci\u00f3n del SKB transmitido\n\ncan_put_echo_skb() toma posesi\u00f3n del SKB y este puede ser liberado durante o despu\u00e9s de la llamada.\n\nSin embargo, xilinx_can xcan_write_frame() sigue usando el SKB despu\u00e9s de la llamada.\n\nCorregir eso llamando a can_put_echo_skb() solo despu\u00e9s de que el c\u00f3digo haya terminado de manipular el SKB.\n\nEl tx_lock se mantiene durante toda la ejecuci\u00f3n de xcan_write_frame() y tambi\u00e9n en el lado de can_get_echo_skb(), por lo que el orden de las operaciones no importa.\n\nUn commit de correcci\u00f3n anterior 3d3c817c3a40 (\u0027can: xilinx_can: Corregir el uso de la memoria skb\u0027) no movi\u00f3 la llamada a can_put_echo_skb() lo suficientemente lejos.\n\n[mkl: a\u00f1adir \u0027commit\u0027 delante de sha1 en la descripci\u00f3n del parche]\n[mkl: corregir sangr\u00eda]"
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        "id": "CVE-2025-39873",
        "lastModified": "2026-10-19T21:10:00.160",
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            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-09-23T06:15:46.670",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1139321161a3ba5e45e61e0738b37f42f20bc57a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/668cc1e3bb21101d074e430de1b7ba8fd10189e7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/725b33deebd6e4c96fe7893f384510a54258f28f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/94b050726288a56a6b8ff55aa641f2fedbd3b44c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e202ffd9e54538ef67ec301ebd6d9da4823466c9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ef79f00be72bd81d2e1e6f060d83cf7e425deee4"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:18:20+00:00",
      "cve": "CVE-2025-39873",
      "id": "CVE-2025-39873",
      "initial_release_date": "2025-09-23T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39873.json",
      "version": "3"
    }
  }
}



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