CVE-2026-72155 (GCVE-0-2026-72155)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-23 12:46
VLAI
Title
mtd: spi-nor: swp: Improve locking user experience
Summary
In the Linux kernel, the following vulnerability has been resolved: mtd: spi-nor: swp: Improve locking user experience In the case of the first block being locked (or the few first blocks), if the user want to fully unlock the device it has two possibilities: - either it asks to unlock the entire device, and this works; - or it asks to unlock just the block(s) that are currently locked, which fails. It fails because the conditions "can_be_top" and "can_be_bottom" are true. Indeed, in this case, we unlock everything, so the TB bit does not matter. However in the current implementation, use_top would be true (as this is the favourite option) and lock_len, which in practice should be reduced down to 0, is set to "nor->params->size - (ofs + len)" which is a positive number. This is wrong. An easy way is to simply add an extra condition. In the unlock() path, if we can achieve the same result from both sides, it means we unlock everything and lock_len must simply be 0. A comment is added to clarify that logic.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7067 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3dd8012a8eeb3702fa17450ec1a16a3f38af138d , < 23c285be8f6fcde9088fe12bb69c701d46696be1 (git)
Affected: 3dd8012a8eeb3702fa17450ec1a16a3f38af138d , < a6fd2145c73b80bb6a5eed7355a4f63597d712d9 (git)
Affected: 3dd8012a8eeb3702fa17450ec1a16a3f38af138d , < 9a0d8dec3d11ca95d67537ea8fa6ee2730a5038a (git)
Affected: 3dd8012a8eeb3702fa17450ec1a16a3f38af138d , < dc341272cf8e15a2c511db3c4df5dab8adf70ad0 (git)
Affected: 3dd8012a8eeb3702fa17450ec1a16a3f38af138d , < 6110ab5ffd84e8daa654652446a03ce2f77580a7 (git)
Affected: 3dd8012a8eeb3702fa17450ec1a16a3f38af138d , < c0806df5cf806545160f3fdac3c888926ceac557 (git)
Affected: 3dd8012a8eeb3702fa17450ec1a16a3f38af138d , < 12d4d69221159e6d0e72400ec81195d691169b53 (git)
Affected: 3dd8012a8eeb3702fa17450ec1a16a3f38af138d , < e1d456b26bf23e30db305a6184e8abd9ab68bbf2 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 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)
guessed Create a notification for this product.
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        "shortName": "Linux"
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    "dateReserved": "2026-08-09T03:40:39.909Z",
    "dateUpdated": "2026-08-23T12:46:54.916Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: spi-nor: swp: Improve locking user experience\n\nIn the case of the first block being locked (or the few first blocks),\nif the user want to fully unlock the device it has two possibilities:\n- either it asks to unlock the entire device, and this works;\n- or it asks to unlock just the block(s) that are currently locked,\n  which fails.\n\nIt fails because the conditions \"can_be_top\" and \"can_be_bottom\" are\ntrue. Indeed, in this case, we unlock everything, so the TB bit does not\nmatter. However in the current implementation, use_top would be true (as\nthis is the favourite option) and lock_len, which in practice should be\nreduced down to 0, is set to \"nor-\u003eparams-\u003esize - (ofs + len)\" which is\na positive number. This is wrong.\n\nAn easy way is to simply add an extra condition. In the unlock() path,\nif we can achieve the same result from both sides, it means we unlock\neverything and lock_len must simply be 0. A comment is added to clarify\nthat logic."
          }
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        "vulnStatus": "Received"
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    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-10-17T21:41:49+00:00",
      "cve": "CVE-2026-72155",
      "id": "CVE-2026-72155",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "185",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mtd: spi-nor: swp: Improve locking user experience",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72155.json",
      "version": "3"
    }
  }
}



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