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CVE-2026-46253— pstore/ram: fix buffer overflow in persistent_ram_save_old()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于pstore ram模块在persistent_ram_save_old函数中多次调用时未正确更新old_log_size，可能导致堆缓冲区溢出和越界读取。

CVSS 7.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 58bda5a1d1ee98254383ef34f76b2c35140513ea affected
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 06d2c8bd108cea503f6f6e13e47495ed1085275f affected
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 2fa9a047c6a50ec80c3890dd623b85e237f0d1fd affected
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< cff0ef043e16feb5a02307c8f9d0117a96c5587c affected
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 9a6fc69a570c0780834246d52c856cc3dbc2605f affected
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 4f73486ca822305c1cf5b8ebc0b53a6ab3801a81 affected
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 7cfe964e61c0ab667abd5f5b68e0acbf783efa4f affected
201e4aca5aa179e6c69a4dcd36a3562e56b8d670< 5669645c052f235726a85f443769b6fc02f66762 affected
… +10 more rows
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I. Basic Information for CVE-2026-46253

Vulnerability Information
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Vulnerability Title
pstore/ram: fix buffer overflow in persistent_ram_save_old()
Source: CVE Program / CVE List V5
Vulnerability 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 -> 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于pstore ram模块在persistent_ram_save_old函数中多次调用时未正确更新old_log_size，可能导致堆缓冲区溢出和越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 201e4aca5aa179e6c69a4dcd36a3562e56b8d670 ~ 58bda5a1d1ee98254383ef34f76b2c35140513ea -
Linux Linux 3.5 -

II. Public POCs for CVE-2026-46253

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III. Intelligence Information for CVE-2026-46253

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Patches & Fixes for CVE-2026-46253 (8)

Same Patch Batch · Linux · 2026-06-03 · 32 CVEs total

CVE-2026-46244 9.1 CRITICAL netfilter: nft_inner: Fix IPv6 inner_thoff desync
CVE-2026-46266 9.1 CRITICAL inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP
CVE-2026-46264 8.8 HIGH drm/xe/pf: Fix sysfs initialization
CVE-2026-46273 8.6 HIGH ibmveth: Disable GSO for packets with small MSS
CVE-2026-46251 8.4 HIGH btrfs: fix block_group_tree dirty_list corruption
CVE-2026-46270 8.4 HIGH power: supply: rt9455: Fix use-after-free in power_supply_changed()
CVE-2026-46263 7.8 HIGH drm/amd/display: Fix out-of-bounds stream encoder index v3
CVE-2026-46260 7.8 HIGH ipv6: Fix out-of-bound access in fib6_add_rt2node().
CVE-2026-46259 7.8 HIGH procfs: fix missing RCU protection when reading real_parent in do_task_stat()
CVE-2026-46271 7.8 HIGH wifi: ath12k: do WoW offloads only on primary link
CVE-2026-46265 7.5 HIGH RDMA/hns: Fix WQ_MEM_RECLAIM warning
CVE-2026-46250 7.3 HIGH MIPS: Work around LLVM bug when gp is used as global register variable
CVE-2025-71314 drm/panthor: Recover from panthor_gpu_flush_caches() failures
CVE-2026-46245 drm/amd/display: Fix dc_link NULL handling in HPD init
CVE-2025-71313 PCI: endpoint: Add missing NULL check for alloc_workqueue()
CVE-2026-46246 power: supply: pm8916_lbc: Fix use-after-free for extcon in IRQ handler
CVE-2026-46247 clk: qcom: gfx3d: add parent to parent request map
CVE-2026-46248 wifi: ath12k: clear stale link mapping of ahvif->links_map
CVE-2026-46249 octeontx2-af: Fix PF driver crash with kexec kernel booting
CVE-2026-46258 gpio: cdev: Avoid NULL dereference in linehandle_create()

Showing top 20 of 32 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46253

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