---
id: CVE-2025-39865
title: 'tee: fix NULL pointer dereference in tee_shm_put'
summary: "In the Linux kernel, the following vulnerability has been resolved:\n\ntee: fix NULL pointer dereference in tee_shm_put\n\ntee_shm_put have NULL pointer dereference:\n\n__optee_disable_shm_cache -->\n\tshm = reg_pair_to_ptr(...);//shm maybe retu…"
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c05d8f66ec3470e5212c4d08c46d6cb5738d600d <
    f266188603c34e6e234fb0dfc3185f0ba98d71b7
  - >-
    Linux >= 492eb7afe858d60408b2da09adc78540c4d16543 <
    4377eac565c297fdfccd2f8e9bf94ee84ff6172f
  - >-
    Linux >= dfd0743f1d9ea76931510ed150334d571fbab49d <
    25e315bc8ad363bd1194e49062f183ad4011957e
  - >-
    Linux >= dfd0743f1d9ea76931510ed150334d571fbab49d <
    add1ecc8f3ad8df22e3599c5c88d7907cc2a3079
  - >-
    Linux >= dfd0743f1d9ea76931510ed150334d571fbab49d <
    963fca19fe34c496e04f7dd133b807b76a5434ca
  - >-
    Linux >= dfd0743f1d9ea76931510ed150334d571fbab49d <
    5e07a4235bb85d9ef664411e4ff4ac34783c18ff
  - >-
    Linux >= dfd0743f1d9ea76931510ed150334d571fbab49d <
    e4a718a3a47e89805c3be9d46a84de1949a98d5d
  - Linux 3d556a28bbfe34a80b014db49908b0f1bcb1ae80
  - Linux b4a661b4212b8fac8853ec3b68e4a909dccc88a1
  - Linux 940e68e57ab69248fabba5889e615305789db8a7
  - Linux >= 5.10.89 < 5.10.243
  - Linux >= 5.15.12 < 5.15.192
  - Linux >= 4.14.261 < 4.15
  - Linux >= 4.19.224 < 4.20
  - Linux >= 5.4.170 < 5.5
  - Linux 5.16
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T21:12:44.475636Z'
published: '2025-09-19'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:23:06.136Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-39865'
references:
  - url: 'https://git.kernel.org/stable/c/f266188603c34e6e234fb0dfc3185f0ba98d71b7'
  - url: 'https://git.kernel.org/stable/c/4377eac565c297fdfccd2f8e9bf94ee84ff6172f'
  - url: 'https://git.kernel.org/stable/c/25e315bc8ad363bd1194e49062f183ad4011957e'
  - url: 'https://git.kernel.org/stable/c/add1ecc8f3ad8df22e3599c5c88d7907cc2a3079'
  - url: 'https://git.kernel.org/stable/c/963fca19fe34c496e04f7dd133b807b76a5434ca'
  - url: 'https://git.kernel.org/stable/c/5e07a4235bb85d9ef664411e4ff4ac34783c18ff'
  - url: 'https://git.kernel.org/stable/c/e4a718a3a47e89805c3be9d46a84de1949a98d5d'
tags:
  - cve.org
epss: 0.00164
epssPercentile: 0.05619
ingestedAt: '2026-11-05T22:38:32.044Z'
---

## Overview

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

tee: fix NULL pointer dereference in tee_shm_put

tee_shm_put have NULL pointer dereference:

__optee_disable_shm_cache -->
	shm = reg_pair_to_ptr(...);//shm maybe return NULL
        tee_shm_free(shm); -->
		tee_shm_put(shm);//crash

Add check in tee_shm_put to fix it.

panic log:
Unable to handle kernel paging request at virtual address 0000000000100cca
Mem abort info:
ESR = 0x0000000096000004
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x04: level 0 translation fault
Data abort info:
ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
CM = 0, WnR = 0, TnD = 0, TagAccess = 0
GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=0000002049d07000
[0000000000100cca] pgd=0000000000000000, p4d=0000000000000000
Internal error: Oops: 0000000096000004 [#1] SMP
CPU: 2 PID: 14442 Comm: systemd-sleep Tainted: P OE ------- ----
6.6.0-39-generic #38
Source Version: 938b255f6cb8817c95b0dd5c8c2944acfce94b07
Hardware name: greatwall GW-001Y1A-FTH, BIOS Great Wall BIOS V3.0
10/26/2022
pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : tee_shm_put+0x24/0x188
lr : tee_shm_free+0x14/0x28
sp : ffff001f98f9faf0
x29: ffff001f98f9faf0 x28: ffff0020df543cc0 x27: 0000000000000000
x26: ffff001f811344a0 x25: ffff8000818dac00 x24: ffff800082d8d048
x23: ffff001f850fcd18 x22: 0000000000000001 x21: ffff001f98f9fb88
x20: ffff001f83e76218 x19: ffff001f83e761e0 x18: 000000000000ffff
x17: 303a30303a303030 x16: 0000000000000000 x15: 0000000000000003
x14: 0000000000000001 x13: 0000000000000000 x12: 0101010101010101
x11: 0000000000000001 x10: 0000000000000001 x9 : ffff800080e08d0c
x8 : ffff001f98f9fb88 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
x2 : ffff001f83e761e0 x1 : 00000000ffff001f x0 : 0000000000100cca
Call trace:
tee_shm_put+0x24/0x188
tee_shm_free+0x14/0x28
__optee_disable_shm_cache+0xa8/0x108
optee_shutdown+0x28/0x38
platform_shutdown+0x28/0x40
device_shutdown+0x144/0x2b0
kernel_power_off+0x3c/0x80
hibernate+0x35c/0x388
state_store+0x64/0x80
kobj_attr_store+0x14/0x28
sysfs_kf_write+0x48/0x60
kernfs_fop_write_iter+0x128/0x1c0
vfs_write+0x270/0x370
ksys_write+0x6c/0x100
__arm64_sys_write+0x20/0x30
invoke_syscall+0x4c/0x120
el0_svc_common.constprop.0+0x44/0xf0
do_el0_svc+0x24/0x38
el0_svc+0x24/0x88
el0t_64_sync_handler+0x134/0x150
el0t_64_sync+0x14c/0x15

## Affected

- `Linux >= c05d8f66ec3470e5212c4d08c46d6cb5738d600d < f266188603c34e6e234fb0dfc3185f0ba98d71b7`
- `Linux >= 492eb7afe858d60408b2da09adc78540c4d16543 < 4377eac565c297fdfccd2f8e9bf94ee84ff6172f`
- `Linux >= dfd0743f1d9ea76931510ed150334d571fbab49d < 25e315bc8ad363bd1194e49062f183ad4011957e`
- `Linux >= dfd0743f1d9ea76931510ed150334d571fbab49d < add1ecc8f3ad8df22e3599c5c88d7907cc2a3079`
- `Linux >= dfd0743f1d9ea76931510ed150334d571fbab49d < 963fca19fe34c496e04f7dd133b807b76a5434ca`
- `Linux >= dfd0743f1d9ea76931510ed150334d571fbab49d < 5e07a4235bb85d9ef664411e4ff4ac34783c18ff`
- `Linux >= dfd0743f1d9ea76931510ed150334d571fbab49d < e4a718a3a47e89805c3be9d46a84de1949a98d5d`
- `Linux 3d556a28bbfe34a80b014db49908b0f1bcb1ae80`
- `Linux b4a661b4212b8fac8853ec3b68e4a909dccc88a1`
- `Linux 940e68e57ab69248fabba5889e615305789db8a7`
- `Linux >= 5.10.89 < 5.10.243`
- `Linux >= 5.15.12 < 5.15.192`
- `Linux >= 4.14.261 < 4.15`
- `Linux >= 4.19.224 < 4.20`
- `Linux >= 5.4.170 < 5.5`
- `Linux 5.16`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.