CVE-2021-25487 — Samsung Mobile Devices Out-of-Bounds Read Vulnerability

Lack of boundary checking of a buffer in set_skb_priv() of modem interface driver prior to SMR Oct-2021 Release 1 allows OOB read and it results in arbitrary code execution by dereference of invalid function pointer.

01What is this vulnerability?

Lack of boundary checking of a buffer in set_skb_priv() of modem interface driver prior to SMR Oct-2021 Release 1 allows OOB read and it results in arbitrary code execution by dereference of invalid function pointer.

02Affected products

Vendor	Product	Versions
Samsung Mobile	Samsung Mobile Devices	O(8.1), P(9.0), Q(10.0), R(11.0)

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2023-06-29. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2021-10-06T17:10:26.000Z
• Last modified: 2025-10-21T23:25:30.525Z
• Added to CISA KEV: 2023-06-29
• BOD 22-01 due: 2023-07-20

09References

• security.samsungmobile.com — https://security.samsungmobile.com/securityUpdate.smsb?year=2021&month=10