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CVE Record

CVE-2025-38175: binder: fix yet another UAF in binder_devices

In the Linux kernel, the following vulnerability has been resolved: binder: fix yet another UAF in binder_devices Commit e77aff5528a18 ("binderfs: fix use-after-free in binder_devices") addressed a use-after-free where devices could be released without first being removed from the binder_devices list. However, there is a similar path in binder_free_proc() that was missed: ================================================================== BUG: KASAN: slab-use-after-free in binder_remove_device+0xd4/0x100 Write of size 8 at addr ffff0000c773b900 by task umount/467 CPU: 12 UID: 0 PID: 467 Comm: umount Not tainted 6.15.0-rc7-00138-g57483a362741 #9 PREEMPT Hardware name: linux,dummy-virt (DT) Call trace: binder_remove_device+0xd4/0x100 binderfs_evict_inode+0x230/0x2f0 evict+0x25c/0x5dc iput+0x304/0x480 dentry_unlink_inode+0x208/0x46c __dentry_kill+0x154/0x530 [...] Allocated by task 463: __kmalloc_cache_noprof+0x13c/0x324 binderfs_binder_device_create.isra.0+0x138/0xa60 binder_ctl_ioctl+0x1ac/0x230 [...] Freed by task 215: kfree+0x184/0x31c binder_proc_dec_tmpref+0x33c/0x4ac binder_deferred_func+0xc10/0x1108 process_one_work+0x520/0xba4 [...] ================================================================== Call binder_remove_device() within binder_free_proc() to ensure the device is removed from the binder_devices list before being kfreed.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in Linux Binder device cleanup can leave a freed object referenced in a device list. A later cleanup operation may access that memory, potentially crashing the system or enabling local compromise. The supplied CVSS score is 7.8, reflecting possible confidentiality, integrity, and availability impact.

Executive priority

Treat this as a high-priority local privilege and stability risk, especially on shared or exposed hosts. It is less urgent than an unauthenticated remote flaw, but the potential impact is complete compromise. Accelerate vendor-supported kernel updates while validating actual exposure.

Technical view

CVE-2025-38175 is a slab use-after-free in Linux Binder/binderfs cleanup. binder_free_proc() could free a device without removing it from binder_devices, allowing binder_remove_device() to access freed memory during inode eviction. The correction removes the device from the list before freeing it.

Likely exposure

Exposure is limited to affected Linux kernels where the relevant Binder/binderfs lifecycle is reachable. The CVSS vector requires local access and low privileges, with no user interaction. The supplied version data is ambiguous, so distribution-specific kernel builds must be checked against vendor guidance and the referenced fixes.

Exploitation context

The supplied record is not in CISA KEV, and no provided source confirms active exploitation or a public exploit. A KASAN trace demonstrates the memory-safety failure during device cleanup and unmounting, but it does not establish reliable code execution or exploitation in production.

Researcher notes

The reported failure is an eight-byte write to freed slab memory from binder_remove_device() during binderfs inode eviction. Allocation occurs during Binder device creation; freeing occurs through deferred Binder process cleanup. Exploitability beyond denial of service is not established by the supplied evidence, despite the CVSS impact assumptions.

Mitigation direction

  • Update to a vendor-supported kernel containing the applicable referenced fix.
  • Check distribution advisories because the supplied affected-version mapping is ambiguous.
  • Prioritize systems where untrusted local users can reach Binder or binderfs functionality.
  • If patching is delayed, seek vendor guidance; no source-backed workaround is provided.

Validation and detection

  • Inventory deployed kernel builds and identify systems using affected Linux branches.
  • Map distribution package versions to the three referenced stable-kernel commits.
  • Confirm the selected kernel package includes binder_free_proc() device-list removal.
  • After updating, verify systems boot and report the intended patched kernel build.
Prepared
Confidence
high
Sources
5

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.

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CVE-2025-38175 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

1CVSS vectors
3Timeline events
0ADP providers
4Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2025-38175Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux12d909cac1e1c4147cc3417fee804ee12fc6b984, 12d909cac1e1c4147cc3417fee804ee12fc6b984, 12d909cac1e1c4147cc3417fee804ee12fc6b984unaffected
LinuxLinux6.14, 0, 6.14.11, 6.15.2, 6.16affected
Weakness

CWE details

No CWE listed

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