CVE-2023-53331 (GCVE-0-2023-53331)

Vulnerability from cvelistv5 – Published: 2025-09-16 16:12 – Updated: 2026-08-05 09:13
VLAI
Title
pstore/ram: Check start of empty przs during init
Summary
In the Linux kernel, the following vulnerability has been resolved: pstore/ram: Check start of empty przs during init After commit 30696378f68a ("pstore/ram: Do not treat empty buffers as valid"), initialization would assume a prz was valid after seeing that the buffer_size is zero (regardless of the buffer start position). This unchecked start value means it could be outside the bounds of the buffer, leading to future access panics when written to: sysdump_panic_event+0x3b4/0x5b8 atomic_notifier_call_chain+0x54/0x90 panic+0x1c8/0x42c die+0x29c/0x2a8 die_kernel_fault+0x68/0x78 __do_kernel_fault+0x1c4/0x1e0 do_bad_area+0x40/0x100 do_translation_fault+0x68/0x80 do_mem_abort+0x68/0xf8 el1_da+0x1c/0xc0 __raw_writeb+0x38/0x174 __memcpy_toio+0x40/0xac persistent_ram_update+0x44/0x12c persistent_ram_write+0x1a8/0x1b8 ramoops_pstore_write+0x198/0x1e8 pstore_console_write+0x94/0xe0 ... To avoid this, also check if the prz start is 0 during the initialization phase. If not, the next prz sanity check case will discover it (start > size) and zap the buffer back to a sane state. [kees: update commit log with backtrace and clarifications]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:30 UTC
CWE
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: e1e3a46706bd4037e8b7407dc660ae6e05b8ac56 , < 89312657337e6e03ad6e9ea1a462bd9c158c85c8 (git)
Affected: 265242d82a3c6a8bd9120d06b4801f8d7ae9a346 , < c807ccdd812d18985860504b503899f3140a9549 (git)
Affected: 30696378f68a9e3dad6bfe55938b112e72af00c2 , < e972231db29b5d1dccc13bf9d5ba55b6979a69ed (git)
Affected: 30696378f68a9e3dad6bfe55938b112e72af00c2 , < dc2f60de9a7d3efd982440117dab5579898d808c (git)
Affected: 30696378f68a9e3dad6bfe55938b112e72af00c2 , < fedecaeef88899d940b69368c996e8b3b0b8650d (git)
Affected: 30696378f68a9e3dad6bfe55938b112e72af00c2 , < e95d7a8a6edd14f8fab44c777dd7281db91f6ae2 (git)
Affected: 30696378f68a9e3dad6bfe55938b112e72af00c2 , < f77990358628b01bdc03752126ff5f716ea37615 (git)
Affected: 30696378f68a9e3dad6bfe55938b112e72af00c2 , < 25fb4e3402d46f425ec135ef6f09792a4c1b3003 (git)
Affected: 30696378f68a9e3dad6bfe55938b112e72af00c2 , < fe8c3623ab06603eb760444a032d426542212021 (git)
Affected: ec7f99261da9a20d63cbd273511a11a2efe698f2 (git)
Affected: f250e4c562a3bd106575032666e9ef46f31231f8 (git)
Affected: fffdbf586866e9500b53c9d4b061d3983720375a (git)
Affected: 9e969ba431b46b1891c88cea36f722f3bfe8a180 (git)
Affected: 4.14.96 , < 4.14.326 (semver)
Affected: 4.19.18 , < 4.19.295 (semver)
Affected: 3.18.133 , < 3.19 (semver)
Affected: 4.4.172 , < 4.5 (semver)
Affected: 4.9.153 , < 4.10 (semver)
Affected: 4.20.5 , < 4.21 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (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: 6.1.53 , ≤ 6.1.* (semver)
Unaffected: 6.4.16 , ≤ 6.4.* (semver)
Unaffected: 6.5.3 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (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\npstore/ram: Check start of empty przs during init\n\nAfter commit 30696378f68a (\"pstore/ram: Do not treat empty buffers as\nvalid\"), initialization would assume a prz was valid after seeing that\nthe buffer_size is zero (regardless of the buffer start position). This\nunchecked start value means it could be outside the bounds of the buffer,\nleading to future access panics when written to:\n\n sysdump_panic_event+0x3b4/0x5b8\n atomic_notifier_call_chain+0x54/0x90\n panic+0x1c8/0x42c\n die+0x29c/0x2a8\n die_kernel_fault+0x68/0x78\n __do_kernel_fault+0x1c4/0x1e0\n do_bad_area+0x40/0x100\n do_translation_fault+0x68/0x80\n do_mem_abort+0x68/0xf8\n el1_da+0x1c/0xc0\n __raw_writeb+0x38/0x174\n __memcpy_toio+0x40/0xac\n persistent_ram_update+0x44/0x12c\n persistent_ram_write+0x1a8/0x1b8\n ramoops_pstore_write+0x198/0x1e8\n pstore_console_write+0x94/0xe0\n ...\n\nTo avoid this, also check if the prz start is 0 during the initialization\nphase. If not, the next prz sanity check case will discover it (start \u003e\nsize) and zap the buffer back to a sane state.\n\n[kees: update commit log with backtrace and clarifications]"
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              "value": "AV:L - The vulnerable path is confined to local pstore/ramoops initialization and subsequent local writes (pstore console, `/dev/pmsg0` via `persistent_ram_write_user`, or other ramoops backends); there is no network or adjacent-radio entry point into `fs/pstore/ram_core.c`.\nAC:L - Once an empty-but-invalid prz header (valid sig, size 0, non-zero start) is present in persistent RAM\u2014observed in the field and retained across soft reboot on common Android/embedded ramoops deployments\u2014the next write deterministically performs an out-of-bounds update with no race or ASLR dependency; scored Low under the uncertainty/highest-severity rule.\nPR:L - In the highest-impact realistic deployment (Android/ChromeOS-style ramoops with pmsg enabled), an unprivileged local actor can trigger the write through `/dev/pmsg0` (kernel default 0220, often further relaxed on Android) or rely on automatic pstore console writes after boot, without needing real init-namespace root.\nUI:N - No victim action is required: after a vulnerable boot accept of the bad empty buffer, the kernel itself writes via the pstore console on printk/panic, or the attacker writes `/dev/pmsg0` directly.\nS:U - The out-of-bounds write corrupts addresses within the kernel\u2019s own ramoops mapping/security domain and does not cross a VM, IOMMU, or other separate authority boundary.\nC:H - This is an out-of-bounds write through `persistent_ram_update`/`_user` into memory past the logical buffer; per kernel scoring guidance such memory corruption is treated as enabling high confidentiality impact (information disclosure primitives), matching CWE-787 assessment of this CVE.\nI:H - The bug issues a attacker-influenced (pmsg) or kernel-sourced (console) out-of-bounds store via `memcpy_toio`/`copy_from_user` at a corrupted start offset, which is integrity-high memory corruption that can overwrite adjacent mapped persistent-RAM contents and is scored as exploitable for control-flow impact under the OOB-write rule.\nA:H - The demonstrated consequence is a kernel translation fault/oops during the out-of-bounds write (see the fix backtrace through `persistent_ram_write` \u2192 `__memcpy_toio`), which is a full availability loss."
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                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.53",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.4.*",
                  "status": "unaffected",
                  "version": "6.4.16",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.5.*",
                  "status": "unaffected",
                  "version": "6.5.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.6",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.14.326",
                      "versionStartIncluding": "4.14.96",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.295",
                      "versionStartIncluding": "4.19.18",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.257",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.195",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.132",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.53",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.4.16",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.5.3",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "3.18.133",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "4.4.172",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "4.9.153",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "4.20.5",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npstore/ram: Check start of empty przs during init\n\nAfter commit 30696378f68a (\"pstore/ram: Do not treat empty buffers as\nvalid\"), initialization would assume a prz was valid after seeing that\nthe buffer_size is zero (regardless of the buffer start position). This\nunchecked start value means it could be outside the bounds of the buffer,\nleading to future access panics when written to:\n\n sysdump_panic_event+0x3b4/0x5b8\n atomic_notifier_call_chain+0x54/0x90\n panic+0x1c8/0x42c\n die+0x29c/0x2a8\n die_kernel_fault+0x68/0x78\n __do_kernel_fault+0x1c4/0x1e0\n do_bad_area+0x40/0x100\n do_translation_fault+0x68/0x80\n do_mem_abort+0x68/0xf8\n el1_da+0x1c/0xc0\n __raw_writeb+0x38/0x174\n __memcpy_toio+0x40/0xac\n persistent_ram_update+0x44/0x12c\n persistent_ram_write+0x1a8/0x1b8\n ramoops_pstore_write+0x198/0x1e8\n pstore_console_write+0x94/0xe0\n ...\n\nTo avoid this, also check if the prz start is 0 during the initialization\nphase. If not, the next prz sanity check case will discover it (start \u003e\nsize) and zap the buffer back to a sane state.\n\n[kees: update commit log with backtrace and clarifications]"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-09-16T16:12:06.788Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/89312657337e6e03ad6e9ea1a462bd9c158c85c8"
            },
            {
              "url": "https://git.kernel.org/stable/c/c807ccdd812d18985860504b503899f3140a9549"
            },
            {
              "url": "https://git.kernel.org/stable/c/e972231db29b5d1dccc13bf9d5ba55b6979a69ed"
            },
            {
              "url": "https://git.kernel.org/stable/c/dc2f60de9a7d3efd982440117dab5579898d808c"
            },
            {
              "url": "https://git.kernel.org/stable/c/fedecaeef88899d940b69368c996e8b3b0b8650d"
            },
            {
              "url": "https://git.kernel.org/stable/c/e95d7a8a6edd14f8fab44c777dd7281db91f6ae2"
            },
            {
              "url": "https://git.kernel.org/stable/c/f77990358628b01bdc03752126ff5f716ea37615"
            },
            {
              "url": "https://git.kernel.org/stable/c/25fb4e3402d46f425ec135ef6f09792a4c1b3003"
            },
            {
              "url": "https://git.kernel.org/stable/c/fe8c3623ab06603eb760444a032d426542212021"
            }
          ],
          "title": "pstore/ram: Check start of empty przs during init",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2023-53331",
        "datePublished": "2025-09-16T16:12:06.788Z",
        "dateReserved": "2025-09-16T16:08:59.564Z",
        "dateUpdated": "2026-01-14T18:32:59.884Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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