LiveActive security incident?Get immediate response
CVE Record

CVE-2025-39865: tee: fix NULL pointer dereference in tee_shm_put

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

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2025-39865 is a Linux kernel flaw that can crash affected systems when TEE/OP-TEE shared memory cleanup handles a NULL pointer. The public record shows a kernel panic during hibernation or shutdown paths. No CVSS score or active exploitation is provided in the source bundle.

Executive priority

Treat this as a targeted availability risk. It is not currently evidenced as mass-exploited or remotely exploitable, but kernel crashes can disrupt appliances, embedded systems, and servers relying on trusted execution features. Patch through normal kernel maintenance with higher priority for affected operational platforms.

Technical view

The bug is a NULL pointer dereference in tee_shm_put reached from tee_shm_free during __optee_disable_shm_cache. The kernel fix adds a NULL check before dereferencing shared-memory state. The supplied trace shows an ARM64 Linux 6.6.0 system crashing in tee_shm_put while systemd-sleep triggered hibernation.

Likely exposure

Exposure appears limited to Linux systems using the TEE/OP-TEE kernel path on affected kernel versions or vendor backports. The bundle lists Linux kernel streams including 5.10, 5.15, 6.1, 6.6, 6.12, 6.16, and 6.17, but exact downstream package status must be confirmed with the OS or device vendor.

Exploitation context

The sources do not show KEV listing, public exploitation, or exploit details. Evidence supports a denial-of-service style kernel crash, not code execution. The observed crash path involves shutdown or hibernation cleanup, but triggerability across products is not established in the bundle.

Researcher notes

The source bundle lacks CVSS, CWE, detailed version range semantics, and exploitability analysis. The strongest evidence is the upstream fix description and panic trace. Avoid assuming remote attack surface or privilege level without vendor analysis for a specific platform and kernel configuration.

Mitigation direction

  • Apply vendor kernel updates that include the referenced stable Linux fixes.
  • Prioritize systems with TEE or OP-TEE enabled, especially ARM64 platforms.
  • Review Debian LTS and Siemens advisories if those ecosystems apply.
  • Track downstream vendor kernels because backport status may differ from upstream versions.
  • If patching is unavailable, request vendor guidance before applying operational workarounds.

Validation and detection

  • Inventory Linux kernel versions and vendor package build identifiers.
  • Check whether TEE or OP-TEE drivers are present and enabled.
  • Compare installed kernels against vendor advisories and stable commit references.
  • Review crash logs for tee_shm_put, tee_shm_free, or __optee_disable_shm_cache traces.
  • Confirm updated kernels include the NULL check in tee_shm_put.
Prepared
Confidence
medium
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2025-39865 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
12Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxc05d8f66ec3470e5212c4d08c46d6cb5738d600d, 492eb7afe858d60408b2da09adc78540c4d16543, dfd0743f1d9ea76931510ed150334d571fbab49d, dfd0743f1d9ea76931510ed150334d571fbab49d, dfd0743f1d9ea76931510ed150334d571fbab49d, dfd0743f1d9ea76931510ed150334d571fbab49d, dfd0743f1d9ea76931510ed150334d571fbab49d, 3d556a28bbfe34a80b014db49908b0f1bcb1ae80, b4a661b4212b8fac8853ec3b68e4a909dccc88a1, 940e68e57ab69248fabba5889e615305789db8a7, 5.10.89, 5.15.12, 4.14.261, 4.19.224, 5.4.170unaffected
LinuxLinux5.16, 0, 5.10.243, 5.15.192, 6.1.151, 6.6.105, 6.12.46, 6.16.6, 6.17affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.