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Fencer Vulns
medium 4.7

CVE-2023-53401 json

mm: kmem: fix a NULL pointer dereference in obj_stock_flush_required()

published 2025-09-18 13 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-29951

cvss
4.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

mm: kmem: fix a NULL pointer dereference in obj_stock_flush_required()

KCSAN found an issue in obj_stock_flush_required(): stock->cached_objcg can be reset between the check and dereference:

================================================================== BUG: KCSAN: data-race in drain_all_stock / drain_obj_stock

write to 0xffff888237c2a2f8 of 8 bytes by task 19625 on cpu 0: drain_obj_stock+0x408/0x4e0 mm/memcontrol.c:3306 refill_obj_stock+0x9c/0x1e0 mm/memcontrol.c:3340 obj_cgroup_uncharge+0xe/0x10 mm/memcontrol.c:3408 memcg_slab_free_hook mm/slab.h:587 [inline] __cache_free mm/slab.c:3373 [inline] __do_kmem_cache_free mm/slab.c:3577 [inline] kmem_cache_free+0x105/0x280 mm/slab.c:3602 __d_free fs/dcache.c:298 [inline] dentry_free fs/dcache.c:375 [inline] __dentry_kill+0x422/0x4a0 fs/dcache.c:621 dentry_kill+0x8d/0x1e0 dput+0x118/0x1f0 fs/dcache.c:913 __fput+0x3bf/0x570 fs/file_table.c:329 ____fput+0x15/0x20 fs/file_table.c:349 task_work_run+0x123/0x160 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xcf/0xe0 kernel/entry/common.c:171 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888237c2a2f8 of 8 bytes by task 19632 on cpu 1: obj_stock_flush_required mm/memcontrol.c:3319 [inline] drain_all_stock+0x174/0x2a0 mm/memcontrol.c:2361 try_charge_memcg+0x6d0/0xd10 mm/memcontrol.c:2703 try_charge mm/memcontrol.c:2837 [inline] mem_cgroup_charge_skmem+0x51/0x140 mm/memcontrol.c:7290 sock_reserve_memory+0xb1/0x390 net/core/sock.c:1025 sk_setsockopt+0x800/0x1e70 net/core/sock.c:1525 udp_lib_setsockopt+0x99/0x6c0 net/ipv4/udp.c:2692 udp_setsockopt+0x73/0xa0 net/ipv4/udp.c:2817 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3668 __sys_setsockopt+0x1c3/0x230 net/socket.c:2271 __do_sys_setsockopt net/socket.c:2282 [inline] __se_sys_setsockopt net/socket.c:2279 [inline] __x64_sys_setsockopt+0x66/0x80 net/socket.c:2279 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xffff8881382d52c0 -> 0xffff888138893740

Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 19632 Comm: syz-executor.0 Not tainted 6.3.0-rc2-syzkaller-00387-g534293368afa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023

Fix it by using READ_ONCE()/WRITE_ONCE() for all accesses to stock->cached_objcg.

Patch / fix

  • Linux Linux 6.1.45, 6.4.10, 6.5
  • linux Debian 12 6.1.52-1
  • linux Debian 14, Debian 13 6.4.11-1

debian advisories DEBIAN-CVE-2023-53401

  • kernel-rt RHEL 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.89.1.rt7.430.el8_10

red hat advisories RHSA-2026:0536RHSA-2026:0533RHSA-2025:23427RHSA-2025:22800RHSA-2025:22801RHSA-2025:21136

  • kernel-rt Real Time Module 15 SP7 6.4.0-150700.7.22.1
  • kernel-syms-rt Real Time Module 15 SP7 6.4.0-150700.7.22.1
  • kernel-source-rt Real Time Module 15 SP7 6.4.0-150700.7.22.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.18.1
  • kernel-syms-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.18.1
  • kernel-source-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.18.1
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.22.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.22.1

suse advisories SUSE-SU-2025:4141-1SUSE-SU-2025:4132-1SUSE-SU-2025:4057-1SUSE-SU-2025:20870-1SUSE-SU-2025:20898-1SUSE-SU-2025:3751-1

  • kernel-rt AlmaLinux 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel-rt-core AlmaLinux 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel-rt-modules AlmaLinux 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel-rt-debug-core AlmaLinux 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel-rt-debug-modules AlmaLinux 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel-rt-modules-extra AlmaLinux 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel-rt-debug-modules-extra AlmaLinux 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel AlmaLinux 8 4.18.0-553.89.1.el8_10

almalinux advisories ALSA-2025:22800ALSA-2025:22801

  • kernel-rt Rocky Linux 8 4.18.0-553.89.1.rt7.430.el8_10
  • kernel Rocky Linux 8 4.18.0-553.89.1.el8_10

rocky linux advisories RLSA-2025:22800RLSA-2025:22801

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-53401 updated cvss 7.3

kernel: mm: kmem: fix a NULL pointer dereference in obj_stock_flush_required()

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder (v. 9) libperf 5.14.0-503.11.1.el9_5, kernel-debuginfo-common-s390x 5.14.0-503.11.1.el9_5, kernel-debuginfo-common-x86_64 5.14.0-503.11.1.el9_5, kernel-debuginfo-common-aarch64 5.14.0-503.11.1.el9_5, kernel-debuginfo-common-ppc64le 5.14.0-503.11.1.el9_5
    fixed: vendor fix RHSA-2024:9315
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.97.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.97.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.97.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.97.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.97.1.el9_4
    fixed: vendor fix RHSA-2025:19886
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-503.11.1.el9_5, perf 5.14.0-503.11.1.el9_5, rtla 5.14.0-503.11.1.el9_5, kernel-devel-matched 5.14.0-503.11.1.el9_5, kernel-64k-devel-matched 5.14.0-503.11.1.el9_5, kernel-debug-devel-matched 5.14.0-503.11.1.el9_5, +6 more
    fixed: vendor fix RHSA-2024:9315
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.153.1.el9_0, kernel-devel-matched 5.14.0-70.153.1.el9_0, kernel-debug-devel-matched 5.14.0-70.153.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.153.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.153.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.153.1.el9_0, +2 more
    fixed: vendor fix RHSA-2025:21091
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.146.1.el9_2, rtla 5.14.0-284.146.1.el9_2, kernel-devel-matched 5.14.0-284.146.1.el9_2, kernel-64k-devel-matched 5.14.0-284.146.1.el9_2, kernel-debug-devel-matched 5.14.0-284.146.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.146.1.el9_2, +5 more
    fixed: vendor fix RHSA-2025:21051
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.97.1.el9_4, perf 5.14.0-427.97.1.el9_4, rtla 5.14.0-427.97.1.el9_4, kernel-devel-matched 5.14.0-427.97.1.el9_4, kernel-64k-devel-matched 5.14.0-427.97.1.el9_4, kernel-debug-devel-matched 5.14.0-427.97.1.el9_4, +6 more
    fixed: vendor fix RHSA-2025:19886
show 23 more
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.89.1.el8_10, kernel 4.18.0-553.89.1.el8_10, bpftool 4.18.0-553.89.1.el8_10, kernel-core 4.18.0-553.89.1.el8_10, kernel-tools 4.18.0-553.89.1.el8_10, python3-perf 4.18.0-553.89.1.el8_10, +15 more
    fixed: vendor fix RHSA-2025:22801
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.4.0-503.11.1.el9_5, kernel 5.14.0-503.11.1.el9_5, kernel-64k 5.14.0-503.11.1.el9_5, kernel-core 5.14.0-503.11.1.el9_5, kernel-tools 5.14.0-503.11.1.el9_5, python3-perf 5.14.0-503.11.1.el9_5, +29 more
    fixed: vendor fix RHSA-2024:9315
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.183.1.el8_4, kernel 4.18.0-305.183.1.el8_4, bpftool 4.18.0-305.183.1.el8_4, kernel-core 4.18.0-305.183.1.el8_4, kernel-tools 4.18.0-305.183.1.el8_4, python3-perf 4.18.0-305.183.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:0533
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.175.1.el8_6, kernel 4.18.0-372.175.1.el8_6, bpftool 4.18.0-372.175.1.el8_6, kernel-core 4.18.0-372.175.1.el8_6, kernel-tools 4.18.0-372.175.1.el8_6, python3-perf 4.18.0-372.175.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.175.1.el8_6, kernel 4.18.0-372.175.1.el8_6, bpftool 4.18.0-372.175.1.el8_6, kernel-core 4.18.0-372.175.1.el8_6, kernel-tools 4.18.0-372.175.1.el8_6, python3-perf 4.18.0-372.175.1.el8_6, +15 more
    fixed: vendor fix RHSA-2026:0536
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.123.1.el8_8, kernel 4.18.0-477.123.1.el8_8, bpftool 4.18.0-477.123.1.el8_8, kernel-core 4.18.0-477.123.1.el8_8, kernel-tools 4.18.0-477.123.1.el8_8, python3-perf 4.18.0-477.123.1.el8_8, +9 more
    fixed: vendor fix RHSA-2025:23427
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.153.1.el9_0, bpftool 5.14.0-70.153.1.el9_0, kernel-core 5.14.0-70.153.1.el9_0, kernel-tools 5.14.0-70.153.1.el9_0, python3-perf 5.14.0-70.153.1.el9_0, kernel-modules 5.14.0-70.153.1.el9_0, +14 more
    fixed: vendor fix RHSA-2025:21091
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.146.1.el9_2, kernel 5.14.0-284.146.1.el9_2, kernel-64k 5.14.0-284.146.1.el9_2, kernel-core 5.14.0-284.146.1.el9_2, kernel-tools 5.14.0-284.146.1.el9_2, python3-perf 5.14.0-284.146.1.el9_2, +28 more
    fixed: vendor fix RHSA-2025:21051
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.97.1.el9_4, kernel 5.14.0-427.97.1.el9_4, kernel-64k 5.14.0-427.97.1.el9_4, kernel-core 5.14.0-427.97.1.el9_4, kernel-tools 5.14.0-427.97.1.el9_4, python3-perf 5.14.0-427.97.1.el9_4, +28 more
    fixed: vendor fix RHSA-2025:19886
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.183.1.el8_4, kernel 4.18.0-305.183.1.el8_4, bpftool 4.18.0-305.183.1.el8_4, kernel-core 4.18.0-305.183.1.el8_4, kernel-tools 4.18.0-305.183.1.el8_4, python3-perf 4.18.0-305.183.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:0533
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.175.1.el8_6, kernel 4.18.0-372.175.1.el8_6, bpftool 4.18.0-372.175.1.el8_6, kernel-core 4.18.0-372.175.1.el8_6, kernel-tools 4.18.0-372.175.1.el8_6, python3-perf 4.18.0-372.175.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:0536
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.123.1.el8_8, kernel 4.18.0-477.123.1.el8_8, bpftool 4.18.0-477.123.1.el8_8, kernel-core 4.18.0-477.123.1.el8_8, kernel-tools 4.18.0-477.123.1.el8_8, python3-perf 4.18.0-477.123.1.el8_8, +8 more
    fixed: vendor fix RHSA-2025:23427
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.89.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.89.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.89.1.el8_10
    fixed: vendor fix RHSA-2025:22801
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.89.1.rt7.430.el8_10, kernel-rt-kvm 4.18.0-553.89.1.rt7.430.el8_10, kernel-rt-core 4.18.0-553.89.1.rt7.430.el8_10, kernel-rt-modules 4.18.0-553.89.1.rt7.430.el8_10, kernel-rt-debug-kvm 4.18.0-553.89.1.rt7.430.el8_10, kernel-rt-debug-core 4.18.0-553.89.1.rt7.430.el8_10, +4 more
    fixed: vendor fix RHSA-2025:22800
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-kvm 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-core 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-modules 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-debug-kvm 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-debug-core 5.14.0-70.153.1.rt21.225.el9_0, +4 more
    fixed: vendor fix RHSA-2025:21136
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-503.11.1.el9_5, kernel-rt-core 5.14.0-503.11.1.el9_5, kernel-rt-modules 5.14.0-503.11.1.el9_5, kernel-rt-debug-core 5.14.0-503.11.1.el9_5, kernel-rt-modules-core 5.14.0-503.11.1.el9_5, kernel-rt-debug-modules 5.14.0-503.11.1.el9_5, +4 more
    fixed: vendor fix RHSA-2024:9315
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-core 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-modules 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-debug-core 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-debug-modules 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-modules-extra 5.14.0-70.153.1.rt21.225.el9_0, +2 more
    fixed: vendor fix RHSA-2025:21136
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.146.1.rt14.431.el9_2, kernel-rt-core 5.14.0-284.146.1.rt14.431.el9_2, kernel-rt-modules 5.14.0-284.146.1.rt14.431.el9_2, kernel-rt-debug-core 5.14.0-284.146.1.rt14.431.el9_2, kernel-rt-modules-core 5.14.0-284.146.1.rt14.431.el9_2, kernel-rt-debug-modules 5.14.0-284.146.1.rt14.431.el9_2, +4 more
    fixed: vendor fix RHSA-2025:21128
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.97.1.el9_4, kernel-rt-core 5.14.0-427.97.1.el9_4, kernel-rt-modules 5.14.0-427.97.1.el9_4, kernel-rt-debug-core 5.14.0-427.97.1.el9_4, kernel-rt-modules-core 5.14.0-427.97.1.el9_4, kernel-rt-debug-modules 5.14.0-427.97.1.el9_4, +4 more
    fixed: vendor fix RHSA-2025:19886
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-503.11.1.el9_5, kernel-rt-kvm 5.14.0-503.11.1.el9_5, kernel-rt-core 5.14.0-503.11.1.el9_5, kernel-rt-modules 5.14.0-503.11.1.el9_5, kernel-rt-debug-kvm 5.14.0-503.11.1.el9_5, kernel-rt-debug-core 5.14.0-503.11.1.el9_5, +6 more
    fixed: vendor fix RHSA-2024:9315
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.146.1.rt14.431.el9_2, kernel-rt-kvm 5.14.0-284.146.1.rt14.431.el9_2, kernel-rt-core 5.14.0-284.146.1.rt14.431.el9_2, kernel-rt-modules 5.14.0-284.146.1.rt14.431.el9_2, kernel-rt-debug-kvm 5.14.0-284.146.1.rt14.431.el9_2, kernel-rt-debug-core 5.14.0-284.146.1.rt14.431.el9_2, +6 more
    fixed: vendor fix RHSA-2025:21128
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.97.1.el9_4, kernel-rt-kvm 5.14.0-427.97.1.el9_4, kernel-rt-core 5.14.0-427.97.1.el9_4, kernel-rt-modules 5.14.0-427.97.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.97.1.el9_4, kernel-rt-debug-core 5.14.0-427.97.1.el9_4, +6 more
    fixed: vendor fix RHSA-2025:19886
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.89.1.rt7.430.el8_10, kernel-rt-core 4.18.0-553.89.1.rt7.430.el8_10, kernel-rt-modules 4.18.0-553.89.1.rt7.430.el8_10, kernel-rt-debug-core 4.18.0-553.89.1.rt7.430.el8_10, kernel-rt-debug-modules 4.18.0-553.89.1.rt7.430.el8_10, kernel-rt-modules-extra 4.18.0-553.89.1.rt7.430.el8_10, +2 more
    fixed: vendor fix RHSA-2025:22800
  • Red Hat CodeReady Linux Builder (v. 9) kernel-cross-headers 5.14.0-503.11.1.el9_5 Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 10 kernel Red Hat Enterprise Linux AppStream (v. 9) kernel-headers 5.14.0-503.11.1.el9_5
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.