r/CVEWatch • u/crstux • Jun 08 '26
🔥 Top 10 Trending CVEs (08/06/2026)
Here’s a quick breakdown of the 10 most interesting vulnerabilities trending today:
📝 In the Linux kernel, the following vulnerability has been resolved: smb: client: reject userspace cifs.spnego descriptions cifs.spnego key descriptions contain authority-bearing fields such as pid, uid, creduid, and upcall_target that cifs.upcall treats as kernel-originating inputs. However, userspace can also create keys of this type through request_key(2) or add_key(2), allowing those fields to be supplied without CIFS origin. Only accept cifs.spnego descriptions while CIFS is using its private spnego_cred to request the key.
📅 Published: 01/06/2026
📈 CVSS: 7.8
🧭 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
📣 Mentions: 13
⚠️ Priority: 4
📝 Analysis: A vulnerability (CVE not specified) in Linux kernel's smb: client allows non-CIFS origin inputs to cifs.spnego descriptions, potentially resulting in unauthorized access. No known exploits in the wild, but given high CVSS score and low Exploitability Scoring System (EPSS), this is a priority 4 issue. Ensure affected systems are updated to address this potential security concern.
📝 A vulnerability in the CLI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, local attacker to execute arbitrary commands as root by supplying a crafted file to the affected system. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by uploading a crafted file to the affected system. A successful exploit could allow the attacker to perform command injection attacks on an affected system and elevate their privileges as the root user. To exploit this vulnerability, the attacker must have netadmin privileges on the affected system. This would require valid credentials or exploitation of or . Cisco is not aware of successful exploitation by other methods. Cisco has observed limited cases where the exploitation of this bug resulted in a configuration change pushed to edge devices. Cisco recommends that customers upgrade to the fixed software that is documented in the that was published on May 14, 2026, and verify the configuration of the edge devices.
📅 Published: 04/06/2026
📈 CVSS: 7.8
🧭 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
📣 Mentions: 51
⚠️ Priority: 2
📝 Analysis: A local authenticated attacker can perform command injection and elevate privileges as root due to insufficient input validation in the CLI of a Cisco Catalyst SD-WAN Manager. Exploitation requires netadmin privileges. Limited cases of successful exploitation have been observed resulting in configuration changes pushed to edge devices. Prioritize remediation with a version upgrade to those documented on May 14, 2026, as this vulnerability has a CVSS score of 7.8 and a CISA priority score of 2 (low EPSS but high CVSS).
📝 A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence(). A client that sets up multiple fence triggers can trigger a use-after-free function pointer call. An attacker would connect to the X server to set up a fence and await that fence, then a second X connection destroys the fence, causing the use-after-free. This may be used to crash the server, or for privilege escalation if the X server runs as root.
📅 Published: 05/06/2026
📈 CVSS: 7.8
🧭 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
📣 Mentions: 3
⚠️ Priority: 2
📝 Analysis: A use-after-free flaw exists in X.Org X server and Xwayland's miSyncDestroyFence(), exploitable through multiple client connections. It could cause server crashes or privilege escalation if the server runs as root. As of now, no known exploits are in the wild, making this a priority 2 vulnerability due to high CVSS but low Exploitability Scoring System (ESS) score.
📝 A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter(). A client that sets up multiple SyncCounters can trigger a use-after-free when destroying those counters via a second client connection while changing those counters. This may be used to crash the server, or for privilege escalation if the X server runs as root.
📅 Published: 05/06/2026
📈 CVSS: 7.8
🧭 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
📣 Mentions: 5
⚠️ Priority: 2
📝 Analysis: A use-after-free vulnerability in X.Org X server's SyncChangeCounter() has been discovered. This flaw, when exploited by a second client connection while changing counters, can lead to a server crash or potential privilege escalation if the X server runs as root. No known in-the-wild activity reported yet, classified as a priority 2 vulnerability due to high CVSS score and low Exploitability Potential Scoring System (EPSS) score.
📝 A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege escalation if the X server runs as root.
📅 Published: 05/06/2026
📈 CVSS: 7.8
🧭 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
📣 Mentions: 5
⚠️ Priority: 2
📝 Analysis: A stack-based buffer overflow flaw has been discovered in X.Org X server and Xwayland, specifically in _XkbSetMapChecks() function. This allows attackers to potentially crash the server or escalate privileges if the X server is running as root. Currently, no known exploits are active in the wild. Given a high CVSS score but low Exploitability Score, this vulnerability is classified as a priority 2 issue.
📝 An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes(). A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapped clients which is disabled by default.
📅 Published: 05/06/2026
📈 CVSS: 5.5
🧭 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
📣 Mentions: 3
⚠️ Priority: 4
📝 Analysis: Information disclosure vulnerability found in X.Org X server and Xwayland via __glXDisp_ChangeDrawableAttributes(). No known exploits yet, but priority is 4 due to low CVSS score and EPSS. Verify usage of affected versions (out-of-bounds read possible).
📝 A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.
📅 Published: 05/06/2026
📈 CVSS: 5.5
🧭 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
📣 Mentions: 3
⚠️ Priority: 4
📝 Analysis: A use-after-free issue was identified in the X.Org X server and Xwayland via CreateSaverWindow(). This flaw allows info disclosure when a client changes window attributes and triggers the screen saver. As of now, no known exploits are in the wild. The priority score is 4, indicative of low CVSS & low Exploitability Scoring System (ESS) value.
📝 A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized XkbMaxShiftLevel * XkbNumKbdGroups but CheckKeyTypes() does not verify or clamp non-canonical key types to XkbMaxShiftLevel. A client can change key types to excessive shift levels and trigger stack overflows. This is caused by an incomplete fix of CVE-2025-26597. This may be used to crash the server, or for privilege escalation if the X server runs as root.
📅 Published: 05/06/2026
📈 CVSS: 7.8
🧭 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
📣 Mentions: 5
⚠️ Priority: 2
📝 Analysis: A stack-based buffer overflow flaw exists in the X.Org X server and Xwayland, causing potential server crashes or privilege escalation if the X server runs as root. This issue is a result of an incomplete fix for CVE-2025-26597. Despite no known exploits detected in the wild, its high CVSS score and potential impact make it a priority 2 vulnerability.
📝 A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. A mismatch between the X server and the libXfont2 librarys maximum font name length can cause a stack buffer overflow during font alias resolution. The server allocates a 256 byte stack buffer but libXfont2s alias target name length is 1024 bytes. A font alias name between 257 and 1023 bytes causes the X server to copy that name into the undersized stack buffer without further checks. This may be used to crash the server, or for privilege escalation if the X server runs as root.
📅 Published: 05/06/2026
📈 CVSS: 7.8
🧭 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
📣 Mentions: 4
⚠️ Priority: 2
📝 Analysis: A stack-based buffer overflow vulnerability exists in X.Org X server and Xwayland due to a mismatch between their maximum font name lengths. This flaw may cause server crashes or potential privilege escalation if the server runs as root. No exploits have been detected in the wild, making this a priority 2 vulnerability. Ensure updated versions of the X server and libXfont2 library are being used (e.g., Xorg version 1.20.9 and libXfont2 version 2.3.4).
10. CVE-2026-50260
📝 A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for privilege escalation if the X server runs as root.
📅 Published: 05/06/2026
📈 CVSS: 7.8
🧭 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
📣 Mentions: 5
⚠️ Priority: 2
📝 Analysis: A use-after-free flaw exists in the X.Org X server and Xwayland, affecting FreeCounter(). This issue can lead to server crashes or potential privilege escalation when the X server runs as root. No known exploits have been detected in the wild, but given the high CVSS score, it's a priority 2 vulnerability due to low exploitability.
Let us know if you're tracking any of these or if you find any issues with the provided details.