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CVE-2026-50264

Medium priority
Needs evaluation

An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat. A client that requests multiple DRI2BufferBackLeft attachments and one DRI2BufferFrontLeft can trigger...

7 affected packages

xorg, xorg-hwe-16.04, xorg-hwe-18.04, xorg-server, xorg-server-hwe-16.04...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
xorg Not affected Not affected Not affected Not affected Not affected
xorg-hwe-16.04 Not in release Not in release Not in release
xorg-hwe-18.04 Not in release Not in release Not in release Not affected
xorg-server Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
xorg-server-hwe-16.04 Not in release Not in release Not in release
xorg-server-hwe-18.04 Not in release Not in release Not in release Needs evaluation
xwayland Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-50263

Medium priority
Needs evaluation

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.

7 affected packages

xorg, xorg-hwe-16.04, xorg-hwe-18.04, xorg-server, xorg-server-hwe-16.04...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
xorg Not affected Not affected Not affected Not affected Not affected
xorg-hwe-16.04 Not in release Not in release Not in release
xorg-hwe-18.04 Not in release Not in release Not in release Not affected
xorg-server Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
xorg-server-hwe-16.04 Not in release Not in release Not in release
xorg-server-hwe-18.04 Not in release Not in release Not in release Needs evaluation
xwayland Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-50262

Medium priority
Needs evaluation

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...

7 affected packages

xorg, xorg-hwe-16.04, xorg-hwe-18.04, xorg-server, xorg-server-hwe-16.04...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
xorg Not affected Not affected Not affected Not affected Not affected
xorg-hwe-16.04 Not in release Not in release Not in release
xorg-hwe-18.04 Not in release Not in release Not in release Not affected
xorg-server Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
xorg-server-hwe-16.04 Not in release Not in release Not in release
xorg-server-hwe-18.04 Not in release Not in release Not in release Needs evaluation
xwayland Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-50261

Medium priority
Needs evaluation

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...

7 affected packages

xorg, xorg-hwe-16.04, xorg-hwe-18.04, xorg-server, xorg-server-hwe-16.04...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
xorg Not affected Not affected Not affected Not affected Not affected
xorg-hwe-16.04 Not in release Not in release Not in release
xorg-hwe-18.04 Not in release Not in release Not in release Not affected
xorg-server Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
xorg-server-hwe-16.04 Not in release Not in release Not in release
xorg-server-hwe-18.04 Not in release Not in release Not in release Needs evaluation
xwayland Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-50260

Medium priority
Needs evaluation

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...

7 affected packages

xorg, xorg-hwe-16.04, xorg-hwe-18.04, xorg-server, xorg-server-hwe-16.04...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
xorg Not affected Not affected Not affected Not affected Not affected
xorg-hwe-16.04 Not in release Not in release Not in release
xorg-hwe-18.04 Not in release Not in release Not in release Not affected
xorg-server Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
xorg-server-hwe-16.04 Not in release Not in release Not in release
xorg-server-hwe-18.04 Not in release Not in release Not in release Needs evaluation
xwayland Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-50259

Medium priority
Needs evaluation

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...

7 affected packages

xorg, xorg-hwe-16.04, xorg-hwe-18.04, xorg-server, xorg-server-hwe-16.04...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
xorg Not affected Not affected Not affected Not affected Not affected
xorg-hwe-16.04 Not in release Not in release Not in release
xorg-hwe-18.04 Not in release Not in release Not in release Not affected
xorg-server Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
xorg-server-hwe-16.04 Not in release Not in release Not in release
xorg-server-hwe-18.04 Not in release Not in release Not in release Needs evaluation
xwayland Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-50258

Medium priority
Needs evaluation

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...

7 affected packages

xorg, xorg-hwe-16.04, xorg-hwe-18.04, xorg-server, xorg-server-hwe-16.04...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
xorg Not affected Not affected Not affected Not affected Not affected
xorg-hwe-16.04 Not in release Not in release Not in release
xorg-hwe-18.04 Not in release Not in release Not in release Not affected
xorg-server Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
xorg-server-hwe-16.04 Not in release Not in release Not in release
xorg-server-hwe-18.04 Not in release Not in release Not in release Needs evaluation
xwayland Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-50257

Medium priority
Needs evaluation

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...

7 affected packages

xorg, xorg-hwe-16.04, xorg-hwe-18.04, xorg-server, xorg-server-hwe-16.04...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
xorg Not affected Not affected Not affected Not affected Not affected
xorg-hwe-16.04 Not in release Not in release Not in release
xorg-hwe-18.04 Not in release Not in release Not in release Not affected
xorg-server Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
xorg-server-hwe-16.04 Not in release Not in release Not in release
xorg-server-hwe-18.04 Not in release Not in release Not in release Needs evaluation
xwayland Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-50256

Medium priority
Needs evaluation

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 library's maximum font name length can cause a stack buffer overflow during font alias resolution....

7 affected packages

xorg, xorg-hwe-16.04, xorg-hwe-18.04, xorg-server, xorg-server-hwe-16.04...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
xorg Not affected Not affected Not affected Not affected Not affected
xorg-hwe-16.04 Not in release Not in release Not in release
xorg-hwe-18.04 Not in release Not in release Not in release Not affected
xorg-server Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
xorg-server-hwe-16.04 Not in release Not in release Not in release
xorg-server-hwe-18.04 Not in release Not in release Not in release Needs evaluation
xwayland Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-34003

Medium priority
Needs evaluation

A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the...

7 affected packages

xorg, xorg-hwe-16.04, xorg-hwe-18.04, xorg-server, xorg-server-hwe-16.04...

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
xorg Not affected Not affected Not affected Not affected Not affected
xorg-hwe-16.04 Not in release Not in release Not in release
xorg-hwe-18.04 Not in release Not in release Not in release Not affected
xorg-server Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
xorg-server-hwe-16.04 Not in release Not in release Not in release
xorg-server-hwe-18.04 Not in release Not in release Not in release Needs evaluation
xwayland Needs evaluation Needs evaluation Needs evaluation
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