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Review reviewHigh

CVE-2025-40187

Linux

In the Linux kernel, the following vulnerability has been resolved: net/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce() If new_asoc->peer.adaptation_ind=0 and sctp_ulpevent_make_authkey=0 and sctp_ulpevent_make_authkey() returns 0, then the variable ai_ev remains zero and the zero will be dereferenced in the sctp_ulpevent_free() function.

CVSS
7.5
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.11.13
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.5

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce() If new_asoc->peer.adaptation_ind=0 and sctp_ulpevent_make_authkey=0 and sctp_ulpevent_make_authkey() returns 0, then the variable ai_ev remains zero and the zero will be dereferenced in the sctp_ulpevent_free() function.

Affected product and versions

Product
Linux
Affected versions
>= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < 1014b83778c8677f1d7a57c26dc728baa801ac62, >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < 7f702f85df0266ed7b5bab81ba50394c92f3c928, >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < dbceedc0213e75bf3e9f9f9e2f66b10699d004fe, >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < 025419f4e216a3ae0d0cec622262e98e8078c447, >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < c21f45cfa4a9526b34d76b397c9ef080668b6e73, >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < d0e8f1445c19b1786759ba72a38267e1449bab7e, >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < badbd79313e6591616c1b78e29a9b71efed7f035, >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < 2f3119686ef50319490ccaec81a575973da98815, >= 4.17
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Not available