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Review reviewHigh

CVE-2021-47536

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: net/smc: fix wrong list_del in smc_lgr_cleanup_early smc_lgr_cleanup_early() meant to delete the link group from the link group list, but it deleted the list head by mistake. This may cause memory corruption since we didn't remove the real link group from the list and later memseted the link group structure. We got a list corruption panic when testing: [ 231.277259] list_del corruption. prev->next should be ffff8881398a8000, but was 0000000000000000 [ 231.278222] ------------[ cut here ]------------ [ 231.278726] kernel BUG...

CVSS
7.8
EPSS
0.59%
45.0% percentile
CISA KEV
Not listed
Published
2024.05.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.59%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net/smc: fix wrong list_del in smc_lgr_cleanup_early smc_lgr_cleanup_early() meant to delete the link group from the link group list, but it deleted the list head by mistake. This may cause memory corruption since we didn't remove the real link group from the list and later memseted the link group structure. We got a list corruption panic when testing: [ 231.277259] list_del corruption. prev->next should be ffff8881398a8000, but was 0000000000000000 [ 231.278222] ------------[ cut here ]------------ [ 231.278726] kernel BUG...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= a0a62ee15a829ebf8aeec55a4f1688230439b3e0 < 77731fede297a23d26f2d169b4269466b2c82529, >= a0a62ee15a829ebf8aeec55a4f1688230439b3e0 < 95518fe354d712dca6f431cf2a11b8f63bc9a66c, >= a0a62ee15a829ebf8aeec55a4f1688230439b3e0 < 789b6cc2a5f9123b9c549b886fdc47c865cfe0ba, >= 5.5, >= 5.5 < 5.10.84, >= 5.11 < 5.15.7, 5.16
Fixed versions
5.10.84, 5.15.7

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-787