net/xen-netback: prevent UAF in xenvif_flush_hash()
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
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: net/xen-netback: prevent UAF in xenvif_flush_hash() During the list_for_each_entry_rcu iteration call of xenvif_flush_hash, kfree_rcu does not exist inside the rcu read critical section, so if kfree_rcu is called when the rcu grace period ends during the iteration, UAF occurs when accessing head->next after the entry becomes free. Therefore, to solve this, you need to change it to list_for_each_entry_safe.
Why it matters now
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 | 4.7 and later | 5.4.290, 5.10.227, 5.15.168, 6.1.113, 6.6.55, 6.10.14, 6.11.3, 6.12 | Patch available | CNA |
- Linux VendorLinux Affected 4.7 and later Fixed in 5.4.290, 5.10.227, 5.15.168, 6.1.113, 6.6.55, 6.10.14, 6.11.3, 6.12 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | before 5.10.227; 5.11 to before 5.15.168; 5.16 to before 6.1.113; 6.2 to before 6.6.55; 6.7 to before 6.10.14; 6.11 to before 6.11.3 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 5.10.227; 5.11 to before 5.15.168; 5.16 to before 6.1.113; 6.2 to before 6.6.55; 6.7 to before 6.10.14; 6.11 to before 6.11.3 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.4.290, 5.10.227, 5.15.168, 6.1.113, 6.6.55, 6.10.14, 6.11.3, 6.12
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2024-49936
- 2026-10-03 Alias added: GHSA-vp2p-wqj6-25wf
References
Patch 7
- https://git.kernel.org/stable/c/a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22c
- https://git.kernel.org/stable/c/a0465723b8581cad27164c9073fd780904cd22d4
- https://git.kernel.org/stable/c/efcff6ce7467f01f0753609f420333f3f2ceceda
- https://git.kernel.org/stable/c/143edf098b80669d05245b2f2367dd156a83a2c5
- https://git.kernel.org/stable/c/d408889d4b54f5501e4becc4dbbb9065143fbf4e
- https://git.kernel.org/stable/c/54d8639af5568fc41c0e274fc3ec9cf86c59fcbb
- https://git.kernel.org/stable/c/0fa5e94a1811d68fbffa0725efe6d4ca62c03d12
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- 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-2024-49936 · CVE Program
- CVE-2024-49936 · NVD
- FIRST EPSS
- GHSA-vp2p-wqj6-25wf · GitHub Advisory Database · CC BY 4.0
- CVE-2024-49936 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences