CVE-2026-72013 (GCVE-0-2026-72013)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:06
VLAI
Title
riscv: Prevent NULL pointer dereference in machine_kexec_prepare()
Summary
In the Linux kernel, the following vulnerability has been resolved: riscv: Prevent NULL pointer dereference in machine_kexec_prepare() A NULL pointer dereference issue is noticed in riscv's machine_kexec_prepare(), where image->segment[i].buf might be NULL and copied unchecked. The NULL buf comes from ima_add_kexec_buffer(), where kbuf is added by kexec_add_buffer(), but kbuf.buffer is NULL, then it is copied without a check in machine_kexec_prepare(): kexec_file_load -> kimage_file_alloc_init() -> kimage_file_prepare_segments() -> ima_add_kexec_buffer() -> kexec_add_buffer() -> machine_kexec_prepare() -> memcpy() Address this by adding a check before the data copy attempt.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4211742f0f9e083188f4f0ada00d6eeeef31b7c7 , < 606cc45e871e34b80a2f63874f069387a5b44176 (git)
Affected: b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 , < c462e15497dc40abe369b3be7a2c91ac5d1be6f9 (git)
Affected: b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 , < b5f92cc4e24a298bf390b0b189a4b888c0900161 (git)
Affected: b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 , < 6ad6954492697681ebcfc1beb0eb384406cd4b65 (git)
Affected: b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 , < eadd0c2c76aee6a738f17f251434c77db3c606c8 (git)
Affected: b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 , < d5b2752a17efc165793ae38f2c24b5ed9c04ffde (git)
Affected: b7fb4d78a6ade6026d9e5cf438c2a46ab962e032 , < 81bbcff0c053c4f5c711c31a9b72fc492bd96c3f (git)
Affected: 3ca8a07f141fd8eec347a82bdfa4b94164f2bb97 (git)
Affected: 3ba83e46b591381e718007f55c9f831fd0cd7ee8 (git)
Affected: 5.15.47 , < 5.15.212 (semver)
Affected: 5.17.15 , < 5.18 (semver)
Affected: 5.18.4 , < 5.19 (semver)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: Prevent NULL pointer dereference in machine_kexec_prepare()\n\nA NULL pointer dereference issue is noticed in riscv\u0027s\nmachine_kexec_prepare(), where image-\u003esegment[i].buf might be NULL and\ncopied unchecked.\n\nThe NULL buf comes from ima_add_kexec_buffer(), where kbuf is added by\nkexec_add_buffer(), but kbuf.buffer is NULL, then it is copied without\na check in machine_kexec_prepare():\n\n  kexec_file_load\n    -\u003e kimage_file_alloc_init()\n       -\u003e kimage_file_prepare_segments()\n          -\u003e ima_add_kexec_buffer()\n             -\u003e kexec_add_buffer()\n    -\u003e machine_kexec_prepare()\n       -\u003e memcpy()\n\nAddress this by adding a check before the data copy attempt."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72013",
    "datePublished": "2026-08-15T05:51:41.982Z",
    "dateReserved": "2026-08-09T03:40:39.899Z",
    "dateUpdated": "2026-08-17T05:06:35.378Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T16:05:51+00:00",
      "cve": "CVE-2026-72013",
      "id": "CVE-2026-72013",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: riscv: Prevent NULL pointer dereference in machine_kexec_prepare()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72013.json",
      "version": "3"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.