{
  "cveId": "CVE-2026-46253",
  "url": "https://patchblox.com/security/cve/CVE-2026-46253",
  "summary": "CVE-2026-46253 is fixed in 83 products on 1 platform, first by ALAS2023-2026-1514, released March 30, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  pstore/ram: fix buffer overflow in persistent_ra...",
  "description": "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 -\u003E ramoops_get_next_prz for PSTORE_TYPE_DMESG records).  Currently, the function only allocates prz-\u003Eold_log when it is NULL, but it unconditionally updates prz-\u003Eold_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\u002B0x...   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 \u003E= 0)   3. Oops happens (non-fatal, system continues)   4. pstore_dump() writes oops via ramoops_pstore_write() size Y (\u003EX)   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() \u2192 schedule_work() \u2192 pstore_dowork() \u2192 pstore_get_records(1)   9. ramoops_get_next_prz() \u2192 persistent_ram_save_old()  10. buffer_size() returns Y, but old_log is X bytes  11. Y \u003E 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 \u003E= 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.",
  "published": "2026-03-30T09:00:00Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00172,
  "epssPercentile": 0.0659,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.166-197.305.amzn2023",
      "fix": "ALAS2023-2026-1544",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1544",
      "released": "2026-04-07T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.166-197.305.amzn2023",
      "fix": "ALAS2023-2026-1544",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1544",
      "released": "2026-04-07T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.77-99.140.amzn2023",
      "fix": "ALAS2023-2026-1543",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1543",
      "released": "2026-04-07T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.12-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.77-99.140.amzn2023",
      "fix": "ALAS2023-2026-1543",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1543",
      "released": "2026-04-07T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
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      "product": "bpftool6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
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    },
    {
      "platform": "linux",
      "product": "kernel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.166-197.305.amzn2023",
      "fix": "ALAS2023-2026-1544",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1544",
      "released": "2026-04-07T09:00:00Z"
    },
    {
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      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.36.1",
      "fix": "OPENSUSE-SU-2026:21388-1",
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      "fix": "SUSE-SU-2026:2800-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2800-1",
      "released": "2026-07-08T14:59:38Z"
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    {
      "platform": "linux",
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      "released": "2026-07-21T08:27:34Z"
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    {
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      "fix": "ALAS2023-2026-1544",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1544",
      "released": "2026-04-07T09:00:00Z"
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      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2800-1",
      "released": "2026-07-08T14:59:38Z"
    },
    {
      "platform": "linux",
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      "release": "sles 16.0",
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      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}