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CVE-2023-53803 (GCVE-0-2023-53803)

Vulnerability from cvelistv5 – Published: 2025-12-09 00:00 – Updated: 2026-08-05 09:16
VLAI
Title
scsi: ses: Fix slab-out-of-bounds in ses_enclosure_data_process()
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: ses: Fix slab-out-of-bounds in ses_enclosure_data_process() A fix for: BUG: KASAN: slab-out-of-bounds in ses_enclosure_data_process+0x949/0xe30 [ses] Read of size 1 at addr ffff88a1b043a451 by task systemd-udevd/3271 Checking after (and before in next loop) addl_desc_ptr[1] is sufficient, we expect the size to be sanitized before first access to addl_desc_ptr[1]. Make sure we don't walk beyond end of page.
Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 21fab1d0595eacf781705ec3509012a28f298245 , < da1a955c48a16e16e925d6544793914e52a6fa51 (git)
Affected: 21fab1d0595eacf781705ec3509012a28f298245 , < 9e5c7d52085b8c84bc82a261580f0eb170039325 (git)
Affected: 21fab1d0595eacf781705ec3509012a28f298245 , < 467afb1dd630d8c6d172bd6cacc125199b5f4f2d (git)
Affected: 21fab1d0595eacf781705ec3509012a28f298245 , < e4dd25da784b2e07dbfbf04509afa4c5a1375227 (git)
Affected: 21fab1d0595eacf781705ec3509012a28f298245 , < 2b28a7d261cb309912596d6a2d383ca370483527 (git)
Affected: 21fab1d0595eacf781705ec3509012a28f298245 , < 0dfe68394cbe1d4fe579fb325ecc813c50528c5a (git)
Affected: 21fab1d0595eacf781705ec3509012a28f298245 , < 799e8dd2022d2e13f0c5c1906b40ceca07a23349 (git)
Affected: 21fab1d0595eacf781705ec3509012a28f298245 , < 9b4f5028e493cb353a5c8f5c45073eeea0303abd (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.32
Unaffected: 0 , < 2.6.32 (semver)
Unaffected: 4.14.308 , ≤ 4.14.* (semver)
Unaffected: 4.19.276 , ≤ 4.19.* (semver)
Unaffected: 5.4.235 , ≤ 5.4.* (semver)
Unaffected: 5.10.173 , ≤ 5.10.* (semver)
Unaffected: 5.15.99 , ≤ 5.15.* (semver)
Unaffected: 6.1.16 , ≤ 6.1.* (semver)
Unaffected: 6.2.3 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ses: Fix slab-out-of-bounds in ses_enclosure_data_process()\n\nA fix for:\n\nBUG: KASAN: slab-out-of-bounds in ses_enclosure_data_process+0x949/0xe30 [ses]\nRead of size 1 at addr ffff88a1b043a451 by task systemd-udevd/3271\n\nChecking after (and before in next loop) addl_desc_ptr[1] is sufficient, we\nexpect the size to be sanitized before first access to addl_desc_ptr[1].\nMake sure we don\u0027t walk beyond end of page."
        }
      ],
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              "lang": "en",
              "value": "AV:A - The malformed page 10/page 1 payloads are supplied by the enclosure target over the storage fabric (SAS expander/enclosure, FC, or iSCSI/SRP target), so a rogue or compromised device on the SAN segment reaches the parser without local access; this matches the CNA\u0027s treatment of the sibling fix CVE-2023-7324. A malicious USB device asserting the EncServ INQUIRY bit is an additional, less severe path.\nAC:L - The attacker fully controls both the page 10 length field and the page 1 element counts, so reporting a short page 10 while advertising DEVICE/ARRAY_DEVICE elements deterministically drives addl_desc_ptr past the end of the allocation on every probe. No race, timing, or uncontrolled memory-layout condition is involved.\nPR:N - ses_intf_add() runs automatically during SCSI LUN discovery/rescan and binds to any target that sets the EncServ bit in its own INQUIRY response, so no credentials or prior authorization on the host are required. The KASAN report was produced by systemd-udevd during ordinary enumeration.\nUI:N - Enclosure probing is driven by the kernel\u0027s automatic device discovery on link-up/hotplug and on session re-establishment, not by any operator action. No mount, open, or configuration step by a victim is needed.\nS:U - The out-of-bounds read stays within the kernel\u0027s own slab memory and the derived data is exposed through the kernel\u0027s own enclosure sysfs interface. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Adjacent slab memory is read out of bounds and the bytes are retained in ecomp-\u003eslot and scomp-\u003eaddr, with slot exported through the world-readable /sys/class/enclosure/*/*/slot attribute, giving a repeatable heap-adjacency oracle usable to disclose kernel heap contents and defeat layout randomization. Repeated re-probes let the attacker sample different heap neighbours.\nI:N - The defect is strictly a read overrun \u2014 ses_process_descriptor() only loads from the descriptor and writes to in-bounds fields, so there is no out-of-bounds write or control-flow primitive. Any bogus slot/address reported is something a malicious enclosure could already report through well-formed data.\nA:H - With attacker-chosen element counts the pointer can advance up to ~257 bytes per iteration across tens of thousands of iterations, running far past the page10 allocation into unmapped frames and oopsing the kernel, and it trips a KASAN slab-out-of-bounds report that panics hosts running panic_on_warn. The attacker can force this on every discovery cycle."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "datePublished": "2025-12-09T00:00:59.913Z",
    "dateReserved": "2025-12-08T23:58:35.276Z",
    "dateUpdated": "2026-08-05T09:16:06.196Z",
    "state": "PUBLISHED"
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ses: Fix slab-out-of-bounds in ses_enclosure_data_process()\n\nA fix for:\n\nBUG: KASAN: slab-out-of-bounds in ses_enclosure_data_process+0x949/0xe30 [ses]\nRead of size 1 at addr ffff88a1b043a451 by task systemd-udevd/3271\n\nChecking after (and before in next loop) addl_desc_ptr[1] is sufficient, we\nexpect the size to be sanitized before first access to addl_desc_ptr[1].\nMake sure we don\u0027t walk beyond end of page."
          }
        ],
        "id": "CVE-2023-53803",
        "lastModified": "2026-08-04T10:19:21.950",
        "metrics": {
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                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
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                "baseScore": 8.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2025-12-09T01:16:52.130",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T03:48:33+00:00",
      "cve": "CVE-2023-53803",
      "id": "CVE-2023-53803",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "321",
      "product_status:known_affected": "166",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: ses: Fix slab-out-of-bounds in ses_enclosure_data_process()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53803.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T16:46:03Z",
      "cve": "CVE-2023-53803",
      "id": "CVE-2023-53803",
      "initial_release_date": "2025-12-10T00:36:00Z",
      "product_status:known_affected": "548",
      "product_status:known_not_affected": "173",
      "product_status:recommended": "282",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53803",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53803.json",
      "version": "31"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.