CVE-2021-47311: net: qcom/emac: fix UAF in emac_remove
First published: Tue May 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: net: qcom/emac: fix UAF in emac_remove adpt is netdev private data and it cannot be used after free_netdev() call. Using adpt after free_netdev() can cause UAF bug. Fix it by moving free_netdev() at the end of the function.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <4.9.277 | 4.9.277 |
| redhat/kernel | <4.14.241 | 4.14.241 |
| redhat/kernel | <4.19.199 | 4.19.199 |
| redhat/kernel | <5.4.135 | 5.4.135 |
| redhat/kernel | <5.10.53 | 5.10.53 |
| redhat/kernel | <5.13.5 | 5.13.5 |
| redhat/kernel | <5.14 | 5.14 |
| Linux Kernel | >=4.9<4.9.277 | |
| Linux Kernel | >=4.10<4.14.241 | |
| Linux Kernel | >=4.15<4.19.199 | |
| Linux Kernel | >=4.20<5.4.135 | |
| Linux Kernel | >=5.5<5.10.53 | |
| Linux Kernel | >=5.11<5.13.5 | |
| Linux Kernel | =5.14-rc1 | |
| IBM Security Verify Governance - Identity Manager | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Software Stack | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Virtual Appliance | <=ISVG 10.0.2 | |
| IBM Security Verify Governance Identity Manager Container | <=ISVG 10.0.2 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2021-47311
- https://lore.kernel.org/linux-cve-announce/2024052129-CVE-2021-47311-47f4@gregkh/T
- http://redbot.usersys.redhat.com/kpatch/kpatch-sla-kernels.json
- https://access.redhat.com/errata/RHSA-2024:4211
- https://access.redhat.com/errata/RHSA-2024:4352
- https://access.redhat.com/errata/RHSA-2024:4740
- https://access.redhat.com/errata/RHSA-2024:5281
- https://bugzilla.redhat.com/show_bug.cgi?id=2282471
- https://git.kernel.org/stable/c/4d04a42b926e682140776e54188f4a44f1f01a81
- https://git.kernel.org/stable/c/b1e091331920f8fbfc747dcbd16263fcd71abb2d
- https://git.kernel.org/stable/c/11e9d163d631198bb3eb41a677a61b499516c0f7
- https://git.kernel.org/stable/c/2b70ca92847c619d6264c7372ef74fcbfd1e048c
- https://git.kernel.org/stable/c/b560521eca03d0a2db6093a5a632cbdd0a0cf833
- https://git.kernel.org/stable/c/8a225a6e07a57a1538d53637cb3d82bd3e477839
- https://git.kernel.org/stable/c/ad297cd2db8953e2202970e9504cab247b6c7cb4
- https://www.ibm.com/support/pages/node/7230443 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2021-47311?
CVE-2021-47311 is rated as a high severity vulnerability in the Linux kernel.
How do I fix CVE-2021-47311?
To resolve CVE-2021-47311, upgrade to the patched versions of the kernel: 4.9.277, 4.14.241, 4.19.199, 5.4.135, 5.10.53, 5.13.5, or 5.14.
Which versions of the Linux kernel are affected by CVE-2021-47311?
CVE-2021-47311 affects multiple Linux kernel versions prior to the patched releases mentioned.
What kind of bug is associated with CVE-2021-47311?
CVE-2021-47311 is associated with a use-after-free (UAF) bug in the Linux kernel.
Is CVE-2021-47311 exploited in the wild?
As of the latest updates, there is no public indication that CVE-2021-47311 is actively exploited in the wild.
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