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Review reviewHigh

CVE-2023-52483

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: mctp: perform route lookups under a RCU read-side lock Our current route lookups (mctp_route_lookup and mctp_route_lookup_null) traverse the net's route list without the RCU read lock held. This means the route lookup is subject to preemption, resulting in an potential grace period expiry, and so an eventual kfree() while we still have the route pointer. Add the proper read-side critical section locks around the route lookups, preventing premption and a possible parallel kfree. The remaining net->mctp.routes accesses are al...

CVSS
7.8
EPSS
0.23%
14.0% percentile
CISA KEV
Not listed
Published
2024.02.29
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.23%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: mctp: perform route lookups under a RCU read-side lock Our current route lookups (mctp_route_lookup and mctp_route_lookup_null) traverse the net's route list without the RCU read lock held. This means the route lookup is subject to preemption, resulting in an potential grace period expiry, and so an eventual kfree() while we still have the route pointer. Add the proper read-side critical section locks around the route lookups, preventing premption and a possible parallel kfree. The remaining net->mctp.routes accesses are al...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 889b7da23abf92faf34491df95733bda63639e32 < 6c52b12159049046483fdb0c411a0a1869c41a67, >= 889b7da23abf92faf34491df95733bda63639e32 < 1db0724a01b558feb1ecae551782add1951a114a, >= 889b7da23abf92faf34491df95733bda63639e32 < 2405f64a95a7a094eb24cba9bcfaffd1ea264de4, >= 889b7da23abf92faf34491df95733bda63639e32 < 5093bbfc10ab6636b32728e35813cbd79feb063c, >= 5.15, >= 5.15 < 5.15.137, >= 5.16 < 6.1.59, >= 6.2 < 6.5.8, 6.6
Fixed versions
5.15.137, 6.1.59, 6.5.8

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel 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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416