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CVE-2026-46259— procfs: fix missing RCU protection when reading real_parent in do_task_stat()

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procfs模块在do_task_stat函数中读取task->real_parent时缺少RCU保护，可能导致释放后重用。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1003 · OS Credential Dumping

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 06fffb1267c9d986687b69d74a46ee332a50575e< fefa0fcd78be465b7ad4c497fa6ec90d64194c04 affected
06fffb1267c9d986687b69d74a46ee332a50575e< c93a33f28f915d446eea6fb3f0e1def0b3af1982 affected
06fffb1267c9d986687b69d74a46ee332a50575e< 1c8dc5b5517546c68ffae40b948336122bb61306 affected
06fffb1267c9d986687b69d74a46ee332a50575e< 0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e affected
06fffb1267c9d986687b69d74a46ee332a50575e< 73ec7c96601d61d52310c659145bb06d933a0fa6 affected
06fffb1267c9d986687b69d74a46ee332a50575e< 4f9ae386861e280b7631ca252f798d25575627ee affected
06fffb1267c9d986687b69d74a46ee332a50575e< dd8b13cb4ff1a4545a214ed897fdf2bc341155b6 affected
06fffb1267c9d986687b69d74a46ee332a50575e< 76149d53502cf17ef3ae454ff384551236fba867 affected
… +10 more rows
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I. Basic Information for CVE-2026-46259

Vulnerability Information
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Vulnerability Title
procfs: fix missing RCU protection when reading real_parent in do_task_stat()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading real_parent in do_task_stat() When reading /proc/[pid]/stat, do_task_stat() accesses task->real_parent without proper RCU protection, which leads to: cpu 0 cpu 1 ----- ----- do_task_stat var = task->real_parent release_task call_rcu(delayed_put_task_struct) task_tgid_nr_ns(var) rcu_read_lock <--- Too late to protect task->real_parent! task_pid_ptr <--- UAF! rcu_read_unlock This patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add proper RCU protection for accessing task->real_parent.
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procfs模块在do_task_stat函数中读取task->real_parent时缺少RCU保护，可能导致释放后重用。
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 06fffb1267c9d986687b69d74a46ee332a50575e ~ fefa0fcd78be465b7ad4c497fa6ec90d64194c04 -
Linux Linux 2.6.26 -

II. Public POCs for CVE-2026-46259

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III. Intelligence Information for CVE-2026-46259

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Patches & Fixes for CVE-2026-46259 (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-2026-46253 7.8 HIGH pstore/ram: fix buffer overflow in persistent_ram_save_old()
CVE-2026-46260 7.8 HIGH ipv6: Fix out-of-bound access in fib6_add_rt2node().
CVE-2026-46263 7.8 HIGH drm/amd/display: Fix out-of-bounds stream encoder index v3
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-2026-46245 drm/amd/display: Fix dc_link NULL handling in HPD init
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-2025-71314 drm/panthor: Recover from panthor_gpu_flush_caches() failures
CVE-2026-46248 wifi: ath12k: clear stale link mapping of ahvif->links_map
CVE-2025-71313 PCI: endpoint: Add missing NULL check for alloc_workqueue()
CVE-2026-46249 octeontx2-af: Fix PF driver crash with kexec kernel booting
CVE-2026-46257 clocksource/drivers/timer-sp804: Fix an Oops when read_current_timer is called on ARM32 pl

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-2026-46259

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