Monthly
Use-after-free and potential double-free in Tor's conflux subsystem before version 0.4.9.11 enables a malicious exit node to crash Tor clients by triggering memory corruption during circuit recovery. The defect activates when a recovery leg attempts to revive a conflux set whose last linked leg has already been deallocated, resulting in access to freed memory and a possible second free of the same object. No public exploit is identified at time of analysis, but exploitation requires only that an attacker control a malicious exit node within the Tor network, a non-trivial but achievable position for motivated threat actors.
Reference count underflow in FreeBSD's jail subsystem allows an unprivileged local user to double-free a prison structure, yielding two distinct impact paths: on the jail host, this reliably causes an immediate kernel panic, while a user already running inside a jail may be able to exploit the freed structure while still in use to escape the jail and elevate privileges to the host. Affected releases are FreeBSD 15.0-RELEASE before patch level 11 and FreeBSD 15.1-RELEASE before patch level 1, per FreeBSD Security Advisory SA-26:38. EPSS is currently 0.16% (5th percentile) and SSVC classifies exploitation as 'none', suggesting no observed in-the-wild activity, but SSVC technical impact is rated 'total', reflecting the severity of the jail-escape scenario.
Local availability degradation in Mullvad's wireguard.sys kernel driver 0.10.1 stems from improper reference count management (CWE-911) within the AdapterState function of the IOCTL handler. An attacker with high local privileges can trigger this defect to cause driver instability or crash the WireGuard adapter, impacting VPN connectivity. A public proof-of-concept exploit exists; however, this vulnerability is not listed in CISA's Known Exploited Vulnerabilities catalog and carries a CVSS 4.0 score of 4.6, reflecting its constrained impact and access prerequisites.
Local privilege escalation in the Linux kernel networking stack (skbuff/MSG_ZEROCOPY path) allows an unprivileged local user to gain full root via a use-after-free on ubuf_info_msgzc. The pskb_carve_inside_header() and pskb_carve_inside_nonlinear() helpers memcpy the skb_shared_info (including the zerocopy destructor_arg/uarg pointer) into a new buffer without calling net_zcopy_get(), so the uarg refcount is decremented more times than it was incremented, freeing the ubuf_info while live TX skbs still reference it. A working proof-of-concept exists that achieves reliable root escalation on a default kernel configuration; the issue is not listed in CISA KEV and EPSS probability is low (0.21%, 11th percentile).
Use-after-free in the KVM arm64 vGIC-ITS translation cache allows a malicious guest to corrupt host kernel memory by triggering concurrent cache invalidations that double-drop a single reference. The flaw affects Linux 6.10 and later until the stable backports, has no public exploit identified at time of analysis, and EPSS rates real-world exploitation probability as very low (0.02%, 5th percentile) despite the CVSS 9.3 rating.
Use-after-free in the Linux kernel's IPv6 SR (seg6) and RPL lightweight tunnel input paths can be triggered on PREEMPT_RT builds when a higher-priority task races ksoftirqd during a concurrent FIB lookup on a shared nexthop. The flaw causes dst_cache_set_ip6() to call dst_hold() on a freed per-CPU route, producing a kernel warning or memory corruption that an attacker on the network could leverage for denial of service or potential code execution. EPSS is very low (0.02%) and there is no public exploit identified at time of analysis.
A flaw was found in grub2. Rated medium severity (CVSS 4.4), this vulnerability is low attack complexity. No vendor patch available.
Software installed and run as a non-privileged user may conduct improper GPU system calls to trigger use-after-free kernel exceptions. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
The reference count changes made as part of the CVE-2023-33951 and CVE-2023-33952 fixes exposed a use-after-free flaw in the way memory objects were handled when they were being used to store a. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity.
A flaw was found in the Linux kernel's netdevsim device driver, within the scheduling of events. Rated medium severity (CVSS 4.4), this vulnerability is low attack complexity.
Use-after-free and potential double-free in Tor's conflux subsystem before version 0.4.9.11 enables a malicious exit node to crash Tor clients by triggering memory corruption during circuit recovery. The defect activates when a recovery leg attempts to revive a conflux set whose last linked leg has already been deallocated, resulting in access to freed memory and a possible second free of the same object. No public exploit is identified at time of analysis, but exploitation requires only that an attacker control a malicious exit node within the Tor network, a non-trivial but achievable position for motivated threat actors.
Reference count underflow in FreeBSD's jail subsystem allows an unprivileged local user to double-free a prison structure, yielding two distinct impact paths: on the jail host, this reliably causes an immediate kernel panic, while a user already running inside a jail may be able to exploit the freed structure while still in use to escape the jail and elevate privileges to the host. Affected releases are FreeBSD 15.0-RELEASE before patch level 11 and FreeBSD 15.1-RELEASE before patch level 1, per FreeBSD Security Advisory SA-26:38. EPSS is currently 0.16% (5th percentile) and SSVC classifies exploitation as 'none', suggesting no observed in-the-wild activity, but SSVC technical impact is rated 'total', reflecting the severity of the jail-escape scenario.
Local availability degradation in Mullvad's wireguard.sys kernel driver 0.10.1 stems from improper reference count management (CWE-911) within the AdapterState function of the IOCTL handler. An attacker with high local privileges can trigger this defect to cause driver instability or crash the WireGuard adapter, impacting VPN connectivity. A public proof-of-concept exploit exists; however, this vulnerability is not listed in CISA's Known Exploited Vulnerabilities catalog and carries a CVSS 4.0 score of 4.6, reflecting its constrained impact and access prerequisites.
Local privilege escalation in the Linux kernel networking stack (skbuff/MSG_ZEROCOPY path) allows an unprivileged local user to gain full root via a use-after-free on ubuf_info_msgzc. The pskb_carve_inside_header() and pskb_carve_inside_nonlinear() helpers memcpy the skb_shared_info (including the zerocopy destructor_arg/uarg pointer) into a new buffer without calling net_zcopy_get(), so the uarg refcount is decremented more times than it was incremented, freeing the ubuf_info while live TX skbs still reference it. A working proof-of-concept exists that achieves reliable root escalation on a default kernel configuration; the issue is not listed in CISA KEV and EPSS probability is low (0.21%, 11th percentile).
Use-after-free in the KVM arm64 vGIC-ITS translation cache allows a malicious guest to corrupt host kernel memory by triggering concurrent cache invalidations that double-drop a single reference. The flaw affects Linux 6.10 and later until the stable backports, has no public exploit identified at time of analysis, and EPSS rates real-world exploitation probability as very low (0.02%, 5th percentile) despite the CVSS 9.3 rating.
Use-after-free in the Linux kernel's IPv6 SR (seg6) and RPL lightweight tunnel input paths can be triggered on PREEMPT_RT builds when a higher-priority task races ksoftirqd during a concurrent FIB lookup on a shared nexthop. The flaw causes dst_cache_set_ip6() to call dst_hold() on a freed per-CPU route, producing a kernel warning or memory corruption that an attacker on the network could leverage for denial of service or potential code execution. EPSS is very low (0.02%) and there is no public exploit identified at time of analysis.
A flaw was found in grub2. Rated medium severity (CVSS 4.4), this vulnerability is low attack complexity. No vendor patch available.
Software installed and run as a non-privileged user may conduct improper GPU system calls to trigger use-after-free kernel exceptions. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.
The reference count changes made as part of the CVE-2023-33951 and CVE-2023-33952 fixes exposed a use-after-free flaw in the way memory objects were handled when they were being used to store a. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity.
A flaw was found in the Linux kernel's netdevsim device driver, within the scheduling of events. Rated medium severity (CVSS 4.4), this vulnerability is low attack complexity.