CVE-2026-46253

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46253", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.107Z", "datePublished": "2026-06-03T15:49:49.864Z", "dateUpdated": "2026-10-19T19:36:56.007Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:30:47.049Z"}, "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 -> ramoops_get_next_prz\nfor PSTORE_TYPE_DMESG records).\n\nCurrently, the function only allocates prz->old_log when it is NULL,\nbut it unconditionally updates prz->old_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 >= 0)\n 3. Oops happens (non-fatal, system continues)\n 4. pstore_dump() writes oops via ramoops_pstore_write() size Y (>X)\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 > 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 >= 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."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:L - The overflow is reached only from in-kernel pstore/ramoops paths (boot init, kmsg-dump oops handling, pstore timer workqueue, or pstore filesystem rescan via mount), not from any network, adjacent-radio, or physical-device interface.\nAC:L - Once ramoops is present (common on Android, ChromeOS, and embedded targets), a local actor who can trigger a survivable oops and influence kmsg volume can drive the size mismatch; the second `persistent_ram_save_old()` call is then triggered deterministically by the pstore update timer or a pstore remount/rescan without depending on uncontrollable memory layout or victim timing.\nPR:L - Exploitation does not require real init-namespace root: an unprivileged local user (or sandboxed code with a kernel bug primitive) can provoke the non-fatal oops that enlarges the persistent RAM record, while the actual overflow fires later in kernel context during automatic pstore rescan or when crash-log collection runs.\nUI:N - No end-user or administrator action is required on the timer-driven path (`pstore_update_ms` enabled): after the oops is logged, the kernel timer/workqueue automatically rescans records and invokes the vulnerable copy without further interaction.\nS:U - The bug corrupts kernel heap memory inside the same kernel security domain; it does not by itself cross a VM, container, or IOMMU boundary to affect a separate authority.\nC:H - The flaw performs an out-of-bounds heap write via `memcpy_fromio()` and then exposes an out-of-bounds read through the inflated `old_log_size` in `ramoops_pstore_read()`, giving memory-corruption primitives that can disclose adjacent kernel heap contents.\nI:H - The out-of-bounds write into a `kvzalloc()`-allocated shadow buffer is classic kernel heap corruption that can be leveraged for arbitrary memory modification and potential control-flow hijack, not merely a bounded data alteration.\nA:H - The overflow is detected as a slab out-of-bounds condition (KASAN splat) and can panic or oops the kernel during the copy or subsequent read, causing complete loss of availability on affected systems."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/pstore/ram_core.c"], "versions": [{"version": "201e4aca5aa179e6c69a4dcd36a3562e56b8d670", "lessThan": "58bda5a1d1ee98254383ef34f76b2c35140513ea", "status": "affected", "versionType": "git"}, {"version": "201e4aca5aa179e6c69a4dcd36a3562e56b8d670", "lessThan": "06d2c8bd108cea503f6f6e13e47495ed1085275f", "status": "affected", "versionType": "git"}, {"version": "201e4aca5aa179e6c69a4dcd36a3562e56b8d670", "lessThan": "2fa9a047c6a50ec80c3890dd623b85e237f0d1fd", "status": "affected", "versionType": "git"}, {"version": "201e4aca5aa179e6c69a4dcd36a3562e56b8d670", "lessThan": "cff0ef043e16feb5a02307c8f9d0117a96c5587c", "status": "affected", "versionType": "git"}, {"version": "201e4aca5aa179e6c69a4dcd36a3562e56b8d670", "lessThan": "9a6fc69a570c0780834246d52c856cc3dbc2605f", "status": "affected", "versionType": "git"}, {"version": "201e4aca5aa179e6c69a4dcd36a3562e56b8d670", "lessThan": "4f73486ca822305c1cf5b8ebc0b53a6ab3801a81", "status": "affected", "versionType": "git"}, {"version": "201e4aca5aa179e6c69a4dcd36a3562e56b8d670", "lessThan": "7cfe964e61c0ab667abd5f5b68e0acbf783efa4f", "status": "affected", "versionType": "git"}, {"version": "201e4aca5aa179e6c69a4dcd36a3562e56b8d670", "lessThan": "5669645c052f235726a85f443769b6fc02f66762", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/pstore/ram_core.c"], "versions": [{"version": "3.5", "status": "affected"}, {"version": "0", "lessThan": "3.5", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.252", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.202", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.165", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.128", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.14", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.4", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "5.10.252"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "5.15.202"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.1.165"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.6.128"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.12.75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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"https://git.kernel.org/stable/c/5669645c052f235726a85f443769b6fc02f66762"}], "title": "pstore/ram: fix buffer overflow in persistent_ram_save_old()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-46253", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:21:22.923031Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-122", "description": "CWE-122 Heap-based Buffer Overflow"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:36:56.007Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-46253", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:21:22.923031Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-122", "description": "CWE-122 Heap-based Buffer Overflow"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:21:23.484Z"}}], "cna": {"title": "pstore/ram: fix buffer overflow in persistent_ram_save_old()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The overflow is reached only from in-kernel pstore/ramoops paths (boot init, kmsg-dump oops handling, pstore timer workqueue, or pstore filesystem rescan via mount), not from any network, adjacent-radio, or physical-device interface.\nAC:L - Once ramoops is present (common on Android, ChromeOS, and embedded targets), a local actor who can trigger a survivable oops and influence kmsg volume can drive the size mismatch; the second `persistent_ram_save_old()` call is then triggered deterministically by the pstore update timer or a pstore remount/rescan without depending on uncontrollable memory layout or victim timing.\nPR:L - Exploitation does not require real init-namespace root: an unprivileged local user (or sandboxed code with a kernel bug primitive) can provoke the non-fatal oops that enlarges the persistent RAM record, while the actual overflow fires later in kernel context during automatic pstore rescan or when crash-log collection runs.\nUI:N - No end-user or administrator action is required on the timer-driven path (`pstore_update_ms` enabled): after the oops is logged, the kernel timer/workqueue automatically rescans records and invokes the vulnerable copy without further interaction.\nS:U - The bug corrupts kernel heap memory inside the same kernel security domain; it does not by itself cross a VM, container, or IOMMU boundary to affect a separate authority.\nC:H - The flaw performs an out-of-bounds heap write via `memcpy_fromio()` and then exposes an out-of-bounds read through the inflated `old_log_size` in `ramoops_pstore_read()`, giving memory-corruption primitives that can disclose adjacent kernel heap contents.\nI:H - The out-of-bounds write into a `kvzalloc()`-allocated shadow buffer is classic kernel heap corruption that can be leveraged for arbitrary memory modification and potential control-flow hijack, not merely a bounded data alteration.\nA:H - The overflow is detected as a slab out-of-bounds condition (KASAN splat) and can panic or oops the kernel during the copy or subsequent read, causing complete loss of availability on affected systems."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "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"}], "programFiles": ["fs/pstore/ram_core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.5"}, {"status": "unaffected", "version": "0", "lessThan": "3.5", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.252", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.202", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.165", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.128", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.75", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.14", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.4", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/pstore/ram_core.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/58bda5a1d1ee98254383ef34f76b2c35140513ea"}, {"url": "https://git.kernel.org/stable/c/06d2c8bd108cea503f6f6e13e47495ed1085275f"}, {"url": "https://git.kernel.org/stable/c/2fa9a047c6a50ec80c3890dd623b85e237f0d1fd"}, {"url": "https://git.kernel.org/stable/c/cff0ef043e16feb5a02307c8f9d0117a96c5587c"}, {"url": "https://git.kernel.org/stable/c/9a6fc69a570c0780834246d52c856cc3dbc2605f"}, {"url": "https://git.kernel.org/stable/c/4f73486ca822305c1cf5b8ebc0b53a6ab3801a81"}, {"url": "https://git.kernel.org/stable/c/7cfe964e61c0ab667abd5f5b68e0acbf783efa4f"}, {"url": "https://git.kernel.org/stable/c/5669645c052f235726a85f443769b6fc02f66762"}], "x_generator": {"engine": "bippy-1.2.0"}, "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 -> ramoops_get_next_prz\nfor PSTORE_TYPE_DMESG records).\n\nCurrently, the function only allocates prz->old_log when it is NULL,\nbut it unconditionally updates prz->old_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 >= 0)\n 3. Oops happens (non-fatal, system continues)\n 4. pstore_dump() writes oops via ramoops_pstore_write() size Y (>X)\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 > 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 >= 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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.252", "versionStartIncluding": "3.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.202", "versionStartIncluding": "3.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.165", "versionStartIncluding": "3.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.128", "versionStartIncluding": "3.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.75", "versionStartIncluding": "3.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.14", "versionStartIncluding": "3.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.4", "versionStartIncluding": "3.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "3.5"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:30:47.049Z"}}}, "cveMetadata": {"cveId": "CVE-2026-46253", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:36:56.007Z", "dateReserved": "2026-05-13T15:03:33.107Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-06-03T15:49:49.864Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"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 -> ramoops_get_next_prz\nfor PSTORE_TYPE_DMESG records).\n\nCurrently, the function only allocates prz->old_log when it is NULL,\nbut it unconditionally updates prz->old_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 >= 0)\n 3. Oops happens (non-fatal, system continues)\n 4. pstore_dump() writes oops via ramoops_pstore_write() size Y (>X)\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 > 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 >= 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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\npstore/ram: corrige desbordamiento de b\u00fafer en persistent_ram_save_old()\n\npersistent_ram_save_old() puede ser llamada m\u00faltiples veces para la misma persistent_ram_zone (por ejemplo, a trav\u00e9s de ramoops_pstore_read -> ramoops_get_next_prz para registros PSTORE_TYPE_DMESG).\n\nActualmente, la funci\u00f3n solo asigna prz->old_log cuando es NULL, pero actualiza incondicionalmente prz->old_log_size al tama\u00f1o de b\u00fafer actual y luego realiza memcpy_fromio() usando este nuevo tama\u00f1o. Si el tama\u00f1o del b\u00fafer ha crecido desde la primera asignaci\u00f3n (lo que puede ocurrir en diferentes ciclos de arranque del kernel), esto lleva a:\n\n1. Un desbordamiento de b\u00fafer de pila (escritura OOB) en las llamadas a memcpy_fromio()\n2. Una lectura OOB posterior cuando ramoops_pstore_read() accede al b\u00fafer usando el old_log_size incorrecto (m\u00e1s grande)\n\nEl splat de KASAN se ver\u00eda similar a:\n BUG: KASAN: slab-out-of-bounds en ramoops_pstore_read+0x...\n Lectura de tama\u00f1o N en la direcci\u00f3n ... por la tarea ...\n\nEs probable que las condiciones sean extremadamente dif\u00edciles de alcanzar:\n\n 0. Fallo con una escritura de ramoops de menos de record-max-size bytes.\n 1. Reinicio: ramoops se registra, pstore_get_records(0) lee el fallo antiguo, asigna old_log con tama\u00f1o X\n 2. Gestor de fallos registrado, temporizador iniciado (si pstore_update_ms >= 0)\n 3. Ocurre un oops (no fatal, el sistema contin\u00faa)\n 4. pstore_dump() escribe el oops a trav\u00e9s de ramoops_pstore_write() tama\u00f1o Y (>X)\n 5. pstore_new_entry = 1, se llama a pstore_timer_kick()\n 6. El sistema contin\u00faa ejecut\u00e1ndose (no es un oops de p\u00e1nico)\n 7. El temporizador se activa despu\u00e9s de pstore_update_ms milisegundos\n 8. pstore_timefunc() ? schedule_work() ? pstore_dowork() ? pstore_get_records(1)\n 9. ramoops_get_next_prz() ? persistent_ram_save_old()\n 10. buffer_size() devuelve Y, pero old_log es de X bytes\n 11. Y > X: memcpy_fromio() desborda la pila\n\n Requisitos:\n - existe un registro de fallo anterior que no llen\u00f3 el tama\u00f1o del registro (casi imposible ya que el gestor de fallos escribe tanto como puede caber en el registro, limitado por el tama\u00f1o m\u00e1ximo del registro y el b\u00fafer kmsg casi siempre excede el tama\u00f1o m\u00e1ximo del registro)\n - pstore_update_ms >= 0 (deshabilitado por defecto)\n - Oops no fatal (el sistema sobrevive)\n\nLibera y reasigna el b\u00fafer cuando el nuevo tama\u00f1o difiere del tama\u00f1o previamente asignado. Esto asegura que old_log siempre tenga espacio suficiente para los datos que se est\u00e1n copiando."}], "id": "CVE-2026-46253", "lastModified": "2026-10-19T20:18:39.647", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46253", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:21:22.923031Z", "version": "2.0.3"}}]}, "published": "2026-06-03T18:16:26.170", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/06d2c8bd108cea503f6f6e13e47495ed1085275f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2fa9a047c6a50ec80c3890dd623b85e237f0d1fd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4f73486ca822305c1cf5b8ebc0b53a6ab3801a81"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5669645c052f235726a85f443769b6fc02f66762"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/58bda5a1d1ee98254383ef34f76b2c35140513ea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7cfe964e61c0ab667abd5f5b68e0acbf783efa4f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9a6fc69a570c0780834246d52c856cc3dbc2605f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cff0ef043e16feb5a02307c8f9d0117a96c5587c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-122"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: pstore/ram: fix buffer overflow in persistent_ram_save_old()", "id": "2484474", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2484474"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in the Linux kernel's `pstore/ram` component. This vulnerability, a heap buffer overflow, occurs when the system attempts to save old persistent RAM logs and the buffer size changes, leading to an out-of-bounds write. While the conditions for exploitation are extremely difficult to achieve, a successful exploit could lead to memory corruption, potentially causing system instability or a denial of service."], "name": "CVE-2026-46253", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46253\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46253\nhttps://lore.kernel.org/linux-cve-announce/2026060335-CVE-2026-46253-a855@gregkh/T"], "threat_severity": "Moderate"}

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