net: sched: Fix use after free in red_enqueue()
Priority LOW 35CWE-416Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 4 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: net: sched: Fix use after free in red_enqueue() We can't use "skb" again after passing it to qdisc_enqueue(). This is basically identical to commit 2f09707d0c97 ("sch_sfb: Also store skb len before calling child enqueue").
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00193 9th percentileScored 2026-11-07
Fix Partial Linux (Linux): 4.5, 4.9.333, 4.14.299 +6Red Hat: 4 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
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 | 4.4.163 to before 4.5 | 4.5 | Patch available | CNA |
| Linux | Linux | 4.7 and later | 4.9.333, 4.14.299, 4.19.265, 5.4.224, 5.10.154, 5.15.78, 6.0.8, 6.1 | Patch available | CNA |
- Linux VendorLinux Affected 4.4.163 to before 4.5 Fixed in 4.5 Patch available CNA
- Linux VendorLinux Affected 4.7 and later Fixed in 4.9.333, 4.14.299, 4.19.265, 5.4.224, 5.10.154, 5.15.78, 6.0.8, 6.1 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.4.163 to before 4.5; 4.7 to before 4.9.333; 4.10 to before 4.14.299; 4.15 to before 4.19.265; 4.20 to before 5.4.224; 5.5 to before 5.10.154; 5.11 to before 5.15.78; 5.16 to before 6.0.8 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:* | 6.1 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:* | 6.1 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:* | 6.1 rc3 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.4.163 to before 4.5; 4.7 to before 4.9.333; 4.10 to before 4.14.299; 4.15 to before 4.19.265; 4.20 to before 5.4.224; 5.5 to before 5.10.154; 5.11 to before 5.15.78; 5.16 to before 6.0.8 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:* Versions 6.1 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:* Versions 6.1 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:* Versions 6.1 rc3 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.5
- Fix · CNA Linux (Linux) Fixed in 4.9.333, 4.14.299, 4.19.265, 5.4.224, 5.10.154, 5.15.78, 6.0.8, 6.1
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 |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Enterprise Linux 10
Timeline
- 2026-10-02 Threatist record created from CVE-2022-49921
- 2026-10-03 Alias added: GHSA-5gp6-334q-267g
References
Patch 8
- https://git.kernel.org/stable/c/795afe0b9bb6c915f0299a8e309936519be01619
- https://git.kernel.org/stable/c/a238cdcf2bdc72207c74375fc8be13ee549ca9db
- https://git.kernel.org/stable/c/e877f8fa49fbccc63cb2df2e9179bddc695b825a
- https://git.kernel.org/stable/c/52e0429471976785c155bfbf51d80990c6cd46e2
- https://git.kernel.org/stable/c/5960b9081baca85cc7dcb14aec1de85999ea9d36
- https://git.kernel.org/stable/c/fc4b50adb400ee5ec527a04073174e8e73a139fa
- https://git.kernel.org/stable/c/170e5317042c302777ed6d59fdb84af9b0219d4e
- https://git.kernel.org/stable/c/8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9
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- 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-2022-49921 · CVE Program
- CVE-2022-49921 · NVD
- FIRST EPSS
- GHSA-5gp6-334q-267g · GitHub Advisory Database · CC BY 4.0
- CVE-2022-49921 · Red Hat security data · CC BY 4.0
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