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"text":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/gt: fix refcount underflow in intel_engine_park_heartbeat\n\nA use-after-free / refcount underflow is possible when the heartbeat\nworker and intel_engine_park_heartbeat() race to release the same\nengine->heartbeat.systole request.\n\nThe heartbeat worker reads engine->heartbeat.systole and calls\ni915_request_put() on it when the request is complete, but clears\nthe pointer in a separate, non-atomic step. Concurrently, a request\nretirement on another CPU can drop the engine wakeref to zero, triggering\n__engine_park() -> intel_engine_park_heartbeat(). If the heartbeat\ntimer is pending at that point, cancel_delayed_work() returns true and\nintel_engine_park_heartbeat() reads the stale non-NULL systole pointer\nand calls i915_request_put() on it again, causing a refcount underflow:\n\n```\n<4> [487.221889] Workqueue: i915-unordered engine_retire [i915]\n<4> [487.222640] RIP: 0010:refcount_warn_saturate+0x68/0xb0\n...\n<4> [487.222707] Call Trace:\n<4> [487.222711] \n<4> [487.222716] intel_engine_park_heartbeat.part.0+0x6f/0x80 [i915]\n<4> [487.223115] intel_engine_park_heartbeat+0x25/0x40 [i915]\n<4> [487.223566] __engine_park+0xb9/0x650 [i915]\n<4> [487.223973] ____intel_wakeref_put_last+0x2e/0xb0 [i915]\n<4> [487.224408] __intel_wakeref_put_last+0x72/0x90 [i915]\n<4> [487.224797] intel_context_exit_engine+0x7c/0x80 [i915]\n<4> [487.225238] intel_context_exit+0xf1/0x1b0 [i915]\n<4> [487.225695] i915_request_retire.part.0+0x1b9/0x530 [i915]\n<4> [487.226178] i915_request_retire+0x1c/0x40 [i915]\n<4> [487.226625] engine_retire+0x122/0x180 [i915]\n<4> [487.227037] process_one_work+0x239/0x760\n<4> [487.227060] worker_thread+0x200/0x3f0\n<4> [487.227068] ? __pfx_worker_thread+0x10/0x10\n<4> [487.227075] kthread+0x10d/0x150\n<4> [487.227083] ? __pfx_kthread+0x10/0x10\n<4> [487.227092] ret_from_fork+0x3d4/0x480\n<4> [487.227099] ? __pfx_kthread+0x10/0x10\n<4> [487.227107] ret_from_fork_asm+0x1a/0x30\n<4> [487.227141] \n```\n\nFix this by replacing the non-atomic pointer read + separate clear with\nxchg() in both racing paths. xchg() is a single indivisible hardware\ninstruction that atomically reads the old pointer and writes NULL. This\nguarantees only one of the two concurrent callers obtains the non-NULL\npointer and performs the put, the other gets NULL and skips it.\n\n(cherry picked from commit 13238dc0ee4f9ab8dafa2cca7295736191ae2f42)",
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{
"text":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/gt: fix refcount underflow in intel_engine_park_heartbeat\n\nA use-after-free / refcount underflow is possible when the heartbeat\nworker and intel_engine_park_heartbeat() race to release the same\nengine->heartbeat.systole request.\n\nThe heartbeat worker reads engine->heartbeat.systole and calls\ni915_request_put() on it when the request is complete, but clears\nthe pointer in a separate, non-atomic step. Concurrently, a request\nretirement on another CPU can drop the engine wakeref to zero, triggering\n__engine_park() -> intel_engine_park_heartbeat(). If the heartbeat\ntimer is pending at that point, cancel_delayed_work() returns true and\nintel_engine_park_heartbeat() reads the stale non-NULL systole pointer\nand calls i915_request_put() on it again, causing a refcount underflow:\n\n```\n<4> [487.221889] Workqueue: i915-unordered engine_retire [i915]\n<4> [487.222640] RIP: 0010:refcount_warn_saturate+0x68/0xb0\n...\n<4> [487.222707] Call Trace:\n<4> [487.222711] \n<4> [487.222716] intel_engine_park_heartbeat.part.0+0x6f/0x80 [i915]\n<4> [487.223115] intel_engine_park_heartbeat+0x25/0x40 [i915]\n<4> [487.223566] __engine_park+0xb9/0x650 [i915]\n<4> [487.223973] ____intel_wakeref_put_last+0x2e/0xb0 [i915]\n<4> [487.224408] __intel_wakeref_put_last+0x72/0x90 [i915]\n<4> [487.224797] intel_context_exit_engine+0x7c/0x80 [i915]\n<4> [487.225238] intel_context_exit+0xf1/0x1b0 [i915]\n<4> [487.225695] i915_request_retire.part.0+0x1b9/0x530 [i915]\n<4> [487.226178] i915_request_retire+0x1c/0x40 [i915]\n<4> [487.226625] engine_retire+0x122/0x180 [i915]\n<4> [487.227037] process_one_work+0x239/0x760\n<4> [487.227060] worker_thread+0x200/0x3f0\n<4> [487.227068] ? __pfx_worker_thread+0x10/0x10\n<4> [487.227075] kthread+0x10d/0x150\n<4> [487.227083] ? __pfx_kthread+0x10/0x10\n<4> [487.227092] ret_from_fork+0x3d4/0x480\n<4> [487.227099] ? __pfx_kthread+0x10/0x10\n<4> [487.227107] ret_from_fork_asm+0x1a/0x30\n<4> [487.227141] \n```\n\nFix this by replacing the non-atomic pointer read + separate clear with\nxchg() in both racing paths. xchg() is a single indivisible hardware\ninstruction that atomically reads the old pointer and writes NULL. This\nguarantees only one of the two concurrent callers obtains the non-NULL\npointer and performs the put, the other gets NULL and skips it.\n\n(cherry picked from commit 13238dc0ee4f9ab8dafa2cca7295736191ae2f42)",
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],
"details":"kernel security update",
"category":"vendor_fix",
"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2754"
}
],
"scores":[
{
"cvss_v3":{
"baseSeverity":"HIGH",
"baseScore":7.8,
"vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version":"3.1"
},
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}
],
"threats":[
{
"details":"High",
"category":"impact"
}
],
"title":"CVE-2026-31656"
}
]
}