Use After Free
CWE-416
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.
We track 4,465 vulnerabilities of this type. 100% are rated high or critical, and the average CVSS score is 8.3. 109 have been exploited in real attacks.
How this weakness is prevented
- Architecture and Design: Choose a language that provides automatic memory management.
- Implementation: When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.
Latest Use After Free vulnerabilities
- 7.8 High severity
Acrobat DC: Use After Free
Acrobat Reader versions 24.001.30365, 26.001.21651 and earlier are affected by a Use After Free vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victi
- 7.8 High severity
Acrobat DC: Use After Free
Acrobat Reader versions 24.001.30365, 26.001.21651 and earlier are affected by a Use After Free vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victi
- 7.8 High severity
InDesign Desktop: Use After Free
InDesign Desktop versions 21.3, 20.5.3 and earlier are affected by a Use After Free vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open
- 8.1 High severity
Windows 10 Version 1607: Use After Free
Access of resource using incompatible type ('type confusion') in Universal Plug and Play (upnp.dll) allows an unauthorized attacker to execute code over a network.
- 7.0 High severity
Windows 10 Version 1607: Use After Free
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
- 7.0 High severity
Windows 10 Version 1607: Concurrent Execution using Shared Resource with Improper Synchronization
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
- 8.1 High severity
OpenSSL: Use After Free
Issue summary: A specially crafted PKCS#7 or S/MIME signed message could trigger a use-after-free during PKCS#7 signature verification. Impact summary: A use-after-free may result in process crashes, heap corruption, or potentially remote code execution. When
- 7.8 High severity
Windows 10 Version 1809: Concurrent Execution using Shared Resource with Improper Synchronization
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications allows an authorized attacker to elevate privileges locally.
- 7.8 High severity
Windows 10 Version 1809: Concurrent Execution using Shared Resource with Improper Synchronization
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications allows an authorized attacker to elevate privileges locally.
- 7.8 High severity
Windows 10 Version 1809: Concurrent Execution using Shared Resource with Improper Synchronization
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications allows an authorized attacker to elevate privileges locally.
- 7.5 High severity
Remote Desktop client for Windows Desktop: Concurrent Execution using Shared Resource with Improper Synchronization
Concurrent execution using shared resource with improper synchronization ('race condition') in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
- 7.5 High severity
Remote Desktop client for Windows Desktop: Out-of-bounds Write
Concurrent execution using shared resource with improper synchronization ('race condition') in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
- 7.0 High severity
Windows 10 Version 1607: Concurrent Execution using Shared Resource with Improper Synchronization
Concurrent execution using shared resource with improper synchronization ('race condition') in Function Discovery Service (fdwsd.dll) allows an authorized attacker to elevate privileges locally.
- 7.8 High severity
Linux: Use After Free
In the Linux kernel, the following vulnerability has been resolved: Revert "net/smc: Introduce TCP ULP support" This reverts commit d7cd421da9da2cc7b4d25b8537f66db5c8331c40. As reported by Al Viro, the TCP ULP support for SMC is fundamentally broken. The imple
- 7.8 High severity
Linux: Use After Free
In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS
- 7.8 High severity
Linux: Use After Free
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_ct: Only release RCU read lock after ct_ft When looking up a flow table in act_ct in tcf_ct_flow_table_get(), rhashtable_lookup_fast() internally opens and closes an RCU read cr
- 8.8 High severity
Linux: Use After Free
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Reassign nested_mmus array behind mmu_lock kvm->arch.nested_mmus[] is walked under kvm->mmu_lock, including from the MMU notifier path (kvm_unmap_gfn_range() -> kvm_nested_s2_unmap
- 8.3 High severity
Chrome: Use After Free
Use after free in Tracing in Google Chrome prior to 149.0.7827.103 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium)
- 8.8 High severity
Chrome: Use After Free
Use after free in Bluetooth in Google Chrome on Mac prior to 149.0.7827.103 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in Bluetooth in Google Chrome on Mac prior to 149.0.7827.103 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)
- 7.5 High severity
Chrome: Use After Free
Use after free in ServiceWorker in Google Chrome prior to 149.0.7827.103 allowed a remote attacker who had compromised the renderer process to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)
- 8.3 High severity
Chrome: Use After Free
Use after free in Read Anything in Google Chrome prior to 149.0.7827.103 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in Dawn in Google Chrome on Mac prior to 149.0.7827.103 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in WebCodecs in Google Chrome prior to 149.0.7827.103 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in Ozone in Google Chrome on Linux prior to 149.0.7827.103 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in Media in Google Chrome on Windows prior to 149.0.7827.103 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)
- 8.3 High severity
Chrome: Use After Free
Use after free in Codecs in Google Chrome on Windows prior to 149.0.7827.103 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in Guest View in Google Chrome prior to 149.0.7827.103 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in InterestGroups in Google Chrome prior to 149.0.7827.103 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)
- 9.6 Critical severity
Chrome: Use After Free
Use after free in Navigation in Google Chrome prior to 149.0.7827.103 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in PDF in Google Chrome prior to 149.0.7827.103 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted PDF file. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in Payments in Google Chrome prior to 149.0.7827.103 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)
- 8.3 High severity
Chrome: Use After Free
Use after free in Skia in Google Chrome prior to 149.0.7827.103 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 8.3 High severity
Chrome: Use After Free
Use after free in Views in Google Chrome on Windows prior to 149.0.7827.103 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in Payments in Google Chrome on Mac prior to 149.0.7827.103 allowed a remote attacker to execute arbitrary code via a crafted HTML page. (Chromium security severity: High)
- 8.3 High severity
Chrome: Use After Free
Use after free in ServiceWorker in Google Chrome prior to 149.0.7827.103 allowed an attacker who convinced a user to install a malicious extension to potentially perform a sandbox escape via a crafted Chrome Extension. (Chromium security severity: High)
- 9.6 Critical severity
Chrome: Use After Free
Use after free in CameraCapture in Google Chrome on Mac prior to 149.0.7827.103 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 8.3 High severity
Chrome: Use After Free
Use after free in Extensions in Google Chrome prior to 149.0.7827.103 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 9.6 Critical severity
Chrome: Use After Free
Use after free in Network in Google Chrome prior to 149.0.7827.103 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in V8 in Google Chrome prior to 149.0.7827.103 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)