mac80211: fix use-after-free in CCMP/GCMP RX
Priority LOW 38CWE-416Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: mac80211: fix use-after-free in CCMP/GCMP RX When PN checking is done in mac80211, for fragmentation we need to copy the PN to the RX struct so we can later use it to do a comparison, since commit bf30ca922a0c ("mac80211: check defrag PN against current frame"). Unfortunately, in that commit I used the 'hdr' variable without it being necessarily valid, so use-after-free could occur if it was necessary to reallocate (parts of) the frame. Fix this by reloading the variable after the code that results in the reallocations, if any. This fixes https://bugzilla.kernel.org/show_bug.cgi?id=214401.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00342 27th percentileScored 2026-11-07
Fix Partial Linux (Linux): 4.4.286, 4.9.285, 4.14.249 +6Red Hat: 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.4.271 to before 4.4.286; 4.9.271 to before 4.9.285; 4.14.235 to before 4.14.249; 4.19.193 to before 4.19.209; 5.4.124 to before 5.4.151; 5.10.42 to before 5.10.71; 5.12.9 to before 5.13 | 4.4.286, 4.9.285, 4.14.249, 4.19.209, 5.4.151, 5.10.71, 5.13 | Patch available | CNA |
| Linux | Linux | 5.13 and later | 4.4.286, 4.9.285, 4.14.249, 4.19.209, 5.4.151, 5.10.71, 5.14.10, 5.15 | Patch available | CNA |
- Linux VendorLinux Affected 4.4.271 to before 4.4.286; 4.9.271 to before 4.9.285; 4.14.235 to before 4.14.249; 4.19.193 to before 4.19.209; 5.4.124 to before 5.4.151; 5.10.42 to before 5.10.71; 5.12.9 to before 5.13 Fixed in 4.4.286, 4.9.285, 4.14.249, 4.19.209, 5.4.151, 5.10.71, 5.13 Patch available CNA
- Linux VendorLinux Affected 5.13 and later Fixed in 4.4.286, 4.9.285, 4.14.249, 4.19.209, 5.4.151, 5.10.71, 5.14.10, 5.15 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.4.271 to before 4.4.286; 4.9.271 to before 4.9.285; 4.14.235 to before 4.14.249; 4.19.193 to before 4.19.209; 5.4.124 to before 5.4.151; 5.10.42 to before 5.10.71; 5.12.9 to before 5.14.10 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* | 5.15 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* | 5.15 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* | 5.15 rc3 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.4.271 to before 4.4.286; 4.9.271 to before 4.9.285; 4.14.235 to before 4.14.249; 4.19.193 to before 4.19.209; 5.4.124 to before 5.4.151; 5.10.42 to before 5.10.71; 5.12.9 to before 5.14.10 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* Versions 5.15 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* Versions 5.15 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* Versions 5.15 rc3 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.4.286, 4.9.285, 4.14.249, 4.19.209, 5.4.151, 5.10.71, 5.13
- Fix · CNA Linux (Linux) Fixed in 4.4.286, 4.9.285, 4.14.249, 4.19.209, 5.4.151, 5.10.71, 5.14.10, 5.15
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
Not affected: 2 products
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2021-47388
- 2026-10-03 Alias added: GHSA-q44p-8h6w-57m6
References
Patch 8
- https://git.kernel.org/stable/c/447d001b875d0e7f211c4ba004916028da994258
- https://git.kernel.org/stable/c/31de381aef0ab1b342f62485118dc8a19363dc78
- https://git.kernel.org/stable/c/f556e1d6fb9f2923a9a36f3df638c7d79ba09dbb
- https://git.kernel.org/stable/c/3d5d629c99c468458022e9b381789de3595bf4dd
- https://git.kernel.org/stable/c/50149e0866a82cef33e680ee68dc380a5bc75d32
- https://git.kernel.org/stable/c/57de2dcb18742dc2860861c9f496da7d42b67da0
- https://git.kernel.org/stable/c/27d3eb5616ee2c0a3b30c3fa34813368ed1f3dc9
- https://git.kernel.org/stable/c/94513069eb549737bcfc3d988d6ed4da948a2de8
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- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2021-47388 · CVE Program
- CVE-2021-47388 · NVD
- FIRST EPSS
- GHSA-q44p-8h6w-57m6 · GitHub Advisory Database · CC BY 4.0
- CVE-2021-47388 · Red Hat security data · CC BY 4.0
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