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CVE-2021-47334misc/libmasm/module: Fix two use after free in ibmasm_init_one

Description

In the Linux kernel, the following vulnerability has been resolved: misc/libmasm/module: Fix two use after free in ibmasm_init_one In ibmasm_init_one, it calls ibmasm_init_remote_input_dev(). Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are allocated by input_allocate_device(), and assigned to sp->remote.mouse_dev and sp->remote.keybd_dev respectively. In the err_free_devices error branch of ibmasm_init_one, mouse_dev and keybd_dev are freed by input_free_device(), and return error. Then the execution runs into error_send_message error branch of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev. My patch add a "error_init_remote" label to handle the error of ibmasm_init_remote_input_dev(), to avoid the uaf bugs.

Timeline

  1. ID reserved

    By Linux

  2. Published

  3. · 24 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2021-47334, by who scored it
Scored byCVSSScoreVector
NVDNVD · Analyzed3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.28% · top 80% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Affected products

  • Linux · Linux

    • affected 736ce43295682d060f2b93624b4a339f9af6aab1 – < 1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069
    • affected 736ce43295682d060f2b93624b4a339f9af6aab1 – < 29ba8e2ba89ee2862a26d91204dd5fe77ceee25a
    • affected 736ce43295682d060f2b93624b4a339f9af6aab1 – < 5b06ca113bf197aab2ab61288f42506e0049fbab
    • affected 736ce43295682d060f2b93624b4a339f9af6aab1 – < 481a76d4749ee3a27f902ba213fdcbb4bb39720e
    • affected 736ce43295682d060f2b93624b4a339f9af6aab1 – < 38660031e80eaa6cc9370b031c180612f414b00d
    • affected 736ce43295682d060f2b93624b4a339f9af6aab1 – < b9c87ce3bc6331f82811a8cf8e930423c22523a3
    • affected 736ce43295682d060f2b93624b4a339f9af6aab1 – < ef1067d2baa847d53c9988510d99fb494de4d12c
    • affected 736ce43295682d060f2b93624b4a339f9af6aab1 – < a7268e8a227d5a4f0bd1584f556246b0224ab274
    • affected 736ce43295682d060f2b93624b4a339f9af6aab1 – < 7272b591c4cb9327c43443f67b8fbae7657dd9ae

  • Linux · Linux

    • affected 2.6.16
    • unaffected < 2.6.16
    • unaffected 4.4.276 – ≤ 4.4.*
    • unaffected 4.9.276 – ≤ 4.9.*
    • unaffected 4.14.240 – ≤ 4.14.*
    • unaffected 4.19.198 – ≤ 4.19.*
    • unaffected 5.4.134 – ≤ 5.4.*
    • unaffected 5.10.52 – ≤ 5.10.*
    • unaffected 5.12.19 – ≤ 5.12.*
    • unaffected 5.13.4 – ≤ 5.13.*
    • unaffected 5.14 – ≤ *

References

References9

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .