CVE-2026-46253 (GCVE-0-2026-46253)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:49 – Updated: 2026-06-05 06:06
VLAI
Title
pstore/ram: fix buffer overflow in persistent_ram_save_old()
Summary
In the Linux kernel, the following vulnerability has been resolved: pstore/ram: fix buffer overflow in persistent_ram_save_old() persistent_ram_save_old() can be called multiple times for the same persistent_ram_zone (e.g., via ramoops_pstore_read -> ramoops_get_next_prz for PSTORE_TYPE_DMESG records). Currently, the function only allocates prz->old_log when it is NULL, but it unconditionally updates prz->old_log_size to the current buffer size and then performs memcpy_fromio() using this new size. If the buffer size has grown since the first allocation (which can happen across different kernel boot cycles), this leads to: 1. A heap buffer overflow (OOB write) in the memcpy_fromio() calls 2. A subsequent OOB read when ramoops_pstore_read() accesses the buffer using the incorrect (larger) old_log_size The KASAN splat would look similar to: BUG: KASAN: slab-out-of-bounds in ramoops_pstore_read+0x... Read of size N at addr ... by task ... The conditions are likely extremely hard to hit: 0. Crash with a ramoops write of less-than-record-max-size bytes. 1. Reboot: ramoops registers, pstore_get_records(0) reads old crash, allocates old_log with size X 2. Crash handler registered, timer started (if pstore_update_ms >= 0) 3. Oops happens (non-fatal, system continues) 4. pstore_dump() writes oops via ramoops_pstore_write() size Y (>X) 5. pstore_new_entry = 1, pstore_timer_kick() called 6. System continues running (not a panic oops) 7. Timer fires after pstore_update_ms milliseconds 8. pstore_timefunc() → schedule_work() → pstore_dowork() → pstore_get_records(1) 9. ramoops_get_next_prz() → persistent_ram_save_old() 10. buffer_size() returns Y, but old_log is X bytes 11. Y > X: memcpy_fromio() overflows heap Requirements: - a prior crash record exists that did not fill the record size (almost impossible since the crash handler writes as much as it can possibly fit into the record, capped by max record size and the kmsg buffer almost always exceeds the max record size) - pstore_update_ms >= 0 (disabled by default) - Non-fatal oops (system survives) Free and reallocate the buffer when the new size differs from the previously allocated size. This ensures old_log always has sufficient space for the data being copied.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 201e4aca5aa179e6c69a4dcd36a3562e56b8d670 , < 58bda5a1d1ee98254383ef34f76b2c35140513ea (git)
Affected: 201e4aca5aa179e6c69a4dcd36a3562e56b8d670 , < 06d2c8bd108cea503f6f6e13e47495ed1085275f (git)
Affected: 201e4aca5aa179e6c69a4dcd36a3562e56b8d670 , < 2fa9a047c6a50ec80c3890dd623b85e237f0d1fd (git)
Affected: 201e4aca5aa179e6c69a4dcd36a3562e56b8d670 , < cff0ef043e16feb5a02307c8f9d0117a96c5587c (git)
Affected: 201e4aca5aa179e6c69a4dcd36a3562e56b8d670 , < 9a6fc69a570c0780834246d52c856cc3dbc2605f (git)
Affected: 201e4aca5aa179e6c69a4dcd36a3562e56b8d670 , < 4f73486ca822305c1cf5b8ebc0b53a6ab3801a81 (git)
Affected: 201e4aca5aa179e6c69a4dcd36a3562e56b8d670 , < 7cfe964e61c0ab667abd5f5b68e0acbf783efa4f (git)
Affected: 201e4aca5aa179e6c69a4dcd36a3562e56b8d670 , < 5669645c052f235726a85f443769b6fc02f66762 (git)
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Linux Linux Affected: 3.5
Unaffected: 0 , < 3.5 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npstore/ram: fix buffer overflow in persistent_ram_save_old()\n\npersistent_ram_save_old() can be called multiple times for the same\npersistent_ram_zone (e.g., via ramoops_pstore_read -\u003e ramoops_get_next_prz\nfor PSTORE_TYPE_DMESG records).\n\nCurrently, the function only allocates prz-\u003eold_log when it is NULL,\nbut it unconditionally updates prz-\u003eold_log_size to the current buffer\nsize and then performs memcpy_fromio() using this new size. If the\nbuffer size has grown since the first allocation (which can happen\nacross different kernel boot cycles), this leads to:\n\n1. A heap buffer overflow (OOB write) in the memcpy_fromio() calls\n2. A subsequent OOB read when ramoops_pstore_read() accesses the buffer\n   using the incorrect (larger) old_log_size\n\nThe KASAN splat would look similar to:\n  BUG: KASAN: slab-out-of-bounds in ramoops_pstore_read+0x...\n  Read of size N at addr ... by task ...\n\nThe conditions are likely extremely hard to hit:\n\n  0. Crash with a ramoops write of less-than-record-max-size bytes.\n  1. Reboot: ramoops registers, pstore_get_records(0) reads old crash,\n     allocates old_log with size X\n  2. Crash handler registered, timer started (if pstore_update_ms \u003e= 0)\n  3. Oops happens (non-fatal, system continues)\n  4. pstore_dump() writes oops via ramoops_pstore_write() size Y (\u003eX)\n  5. pstore_new_entry = 1, pstore_timer_kick() called\n  6. System continues running (not a panic oops)\n  7. Timer fires after pstore_update_ms milliseconds\n  8. pstore_timefunc() \u2192 schedule_work() \u2192 pstore_dowork() \u2192 pstore_get_records(1)\n  9. ramoops_get_next_prz() \u2192 persistent_ram_save_old()\n 10. buffer_size() returns Y, but old_log is X bytes\n 11. Y \u003e X: memcpy_fromio() overflows heap\n\n  Requirements:\n  - a prior crash record exists that did not fill the record size\n    (almost impossible since the crash handler writes as much as it\n    can possibly fit into the record, capped by max record size and\n    the kmsg buffer almost always exceeds the max record size)\n  - pstore_update_ms \u003e= 0 (disabled by default)\n  - Non-fatal oops (system survives)\n\nFree and reallocate the buffer when the new size differs from the\npreviously allocated size. This ensures old_log always has sufficient\nspace for the data being copied."
        }
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            "version": "3.1"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "cveId": "CVE-2026-46253",
    "datePublished": "2026-06-03T15:49:49.864Z",
    "dateReserved": "2026-05-13T15:03:33.107Z",
    "dateUpdated": "2026-06-05T06:06:25.657Z",
    "state": "PUBLISHED"
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      "date": "2026-07-03",
      "epss": "0.00136",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46253\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-03T18:16:26.170\",\"lastModified\":\"2026-06-17T10:53:25.213\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\npstore/ram: fix buffer overflow in persistent_ram_save_old()\\n\\npersistent_ram_save_old() can be called multiple times for the same\\npersistent_ram_zone (e.g., via ramoops_pstore_read -\u003e ramoops_get_next_prz\\nfor PSTORE_TYPE_DMESG records).\\n\\nCurrently, the function only allocates prz-\u003eold_log when it is NULL,\\nbut it unconditionally updates prz-\u003eold_log_size to the current buffer\\nsize and then performs memcpy_fromio() using this new size. If the\\nbuffer size has grown since the first allocation (which can happen\\nacross different kernel boot cycles), this leads to:\\n\\n1. A heap buffer overflow (OOB write) in the memcpy_fromio() calls\\n2. A subsequent OOB read when ramoops_pstore_read() accesses the buffer\\n   using the incorrect (larger) old_log_size\\n\\nThe KASAN splat would look similar to:\\n  BUG: KASAN: slab-out-of-bounds in ramoops_pstore_read+0x...\\n  Read of size N at addr ... by task ...\\n\\nThe conditions are likely extremely hard to hit:\\n\\n  0. Crash with a ramoops write of less-than-record-max-size bytes.\\n  1. Reboot: ramoops registers, pstore_get_records(0) reads old crash,\\n     allocates old_log with size X\\n  2. Crash handler registered, timer started (if pstore_update_ms \u003e= 0)\\n  3. Oops happens (non-fatal, system continues)\\n  4. pstore_dump() writes oops via ramoops_pstore_write() size Y (\u003eX)\\n  5. pstore_new_entry = 1, pstore_timer_kick() called\\n  6. System continues running (not a panic oops)\\n  7. Timer fires after pstore_update_ms milliseconds\\n  8. pstore_timefunc() \u2192 schedule_work() \u2192 pstore_dowork() \u2192 pstore_get_records(1)\\n  9. ramoops_get_next_prz() \u2192 persistent_ram_save_old()\\n 10. buffer_size() returns Y, but old_log is X bytes\\n 11. Y \u003e X: memcpy_fromio() overflows heap\\n\\n  Requirements:\\n  - a prior crash record exists that did not fill the record size\\n    (almost impossible since the crash handler writes as much as it\\n    can possibly fit into the record, capped by max record size and\\n    the kmsg buffer almost always exceeds the max record size)\\n  - pstore_update_ms \u003e= 0 (disabled by default)\\n  - Non-fatal oops (system survives)\\n\\nFree and reallocate the buffer when the new size differs from the\\npreviously allocated size. This ensures old_log always has sufficient\\nspace for the data being copied.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/pstore/ram_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"201e4aca5aa179e6c69a4dcd36a3562e56b8d670\",\"lessThan\":\"58bda5a1d1ee98254383ef34f76b2c35140513ea\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"201e4aca5aa179e6c69a4dcd36a3562e56b8d670\",\"lessThan\":\"06d2c8bd108cea503f6f6e13e47495ed1085275f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"201e4aca5aa179e6c69a4dcd36a3562e56b8d670\",\"lessThan\":\"2fa9a047c6a50ec80c3890dd623b85e237f0d1fd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"201e4aca5aa179e6c69a4dcd36a3562e56b8d670\",\"lessThan\":\"cff0ef043e16feb5a02307c8f9d0117a96c5587c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"201e4aca5aa179e6c69a4dcd36a3562e56b8d670\",\"lessThan\":\"9a6fc69a570c0780834246d52c856cc3dbc2605f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"201e4aca5aa179e6c69a4dcd36a3562e56b8d670\",\"lessThan\":\"4f73486ca822305c1cf5b8ebc0b53a6ab3801a81\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"201e4aca5aa179e6c69a4dcd36a3562e56b8d670\",\"lessThan\":\"7cfe964e61c0ab667abd5f5b68e0acbf783efa4f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"201e4aca5aa179e6c69a4dcd36a3562e56b8d670\",\"lessThan\":\"5669645c052f235726a85f443769b6fc02f66762\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/pstore/ram_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.5\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.5\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.252\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.202\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.165\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.128\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.75\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.14\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.4\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.5.1\",\"versionEndExcluding\":\"5.10.252\",\"matchCriteriaId\":\"78DB234D-033A-4925-A93F-12808A20B8F3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.202\",\"matchCriteriaId\":\"4002FC2B-1456-4666-B240-0EBF590C4671\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.165\",\"matchCriteriaId\":\"797C7F46-D0BE-4FB8-A502-C5EF8E6B6654\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.128\",\"matchCriteriaId\":\"851E9353-6C09-4CC9-877E-E09DB164A3C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.75\",\"matchCriteriaId\":\"BCE16369-98ED-41CF-8995-DFDC10B288D2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.14\",\"matchCriteriaId\":\"BF463CB7-1F58-4607-B847-77ED23E4B9B7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*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  }
}


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Taxonomy of the tags.





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.