CVE-2026-45878 (GCVE-0-2026-45878)
Vulnerability from cvelistv5
Published
2026-05-27 12:16
Modified
2026-10-19 19:26
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix watch_id bounds checking in debug address watch v2 The address watch clear code receives watch_id as an unsigned value (u32), but some helper functions were using a signed int and checked bits by shifting with watch_id. If a very large watch_id is passed from userspace, it can be converted to a negative value. This can cause invalid shifts and may access memory outside the watch_points array. drm/amdkfd: Fix watch_id bounds checking in debug address watch v2 Fix this by checking that watch_id is within MAX_WATCH_ADDRESSES before using it. Also use BIT(watch_id) to test and clear bits safely. This keeps the behavior unchanged for valid watch IDs and avoids undefined behavior for invalid ones. Fixes the below: drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c:448 kfd_dbg_trap_clear_dev_address_watch() error: buffer overflow 'pdd->watch_points' 4 <= u32max user_rl='0-3,2147483648-u32max' uncapped drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c 433 int kfd_dbg_trap_clear_dev_address_watch(struct kfd_process_device *pdd, 434 uint32_t watch_id) 435 { 436 int r; 437 438 if (!kfd_dbg_owns_dev_watch_id(pdd, watch_id)) kfd_dbg_owns_dev_watch_id() doesn't check for negative values so if watch_id is larger than INT_MAX it leads to a buffer overflow. (Negative shifts are undefined). 439 return -EINVAL; 440 441 if (!pdd->dev->kfd->shared_resources.enable_mes) { 442 r = debug_lock_and_unmap(pdd->dev->dqm); 443 if (r) 444 return r; 445 } 446 447 amdgpu_gfx_off_ctrl(pdd->dev->adev, false); --> 448 pdd->watch_points[watch_id] = pdd->dev->kfd2kgd->clear_address_watch( 449 pdd->dev->adev, 450 watch_id); v2: (as per, Jonathan Kim) - Add early watch_id >= MAX_WATCH_ADDRESSES validation in the set path to match the clear path. - Drop the redundant bounds check in kfd_dbg_owns_dev_watch_id().
References
Impacted products
Vendor Product Version
Linux Linux Version: e0f85f4690d089cc1a60337decafb1acf7eec45e
Version: e0f85f4690d089cc1a60337decafb1acf7eec45e
Version: e0f85f4690d089cc1a60337decafb1acf7eec45e
Version: e0f85f4690d089cc1a60337decafb1acf7eec45e
Version: e0f85f4690d089cc1a60337decafb1acf7eec45e
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Fix watch_id bounds checking in debug address watch v2\n\nThe address watch clear code receives watch_id as an unsigned value\n(u32), but some helper functions were using a signed int and checked\nbits by shifting with watch_id.\n\nIf a very large watch_id is passed from userspace, it can be converted\nto a negative value.  This can cause invalid shifts and may access\nmemory outside the watch_points array.\n\ndrm/amdkfd: Fix watch_id bounds checking in debug address watch v2\n\nFix this by checking that watch_id is within MAX_WATCH_ADDRESSES before\nusing it.  Also use BIT(watch_id) to test and clear bits safely.\n\nThis keeps the behavior unchanged for valid watch IDs and avoids\nundefined behavior for invalid ones.\n\nFixes the below:\ndrivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c:448\nkfd_dbg_trap_clear_dev_address_watch() error: buffer overflow\n\u0027pdd-\u003ewatch_points\u0027 4 \u003c= u32max user_rl=\u00270-3,2147483648-u32max\u0027 uncapped\n\ndrivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c\n    433 int kfd_dbg_trap_clear_dev_address_watch(struct kfd_process_device *pdd,\n    434                                         uint32_t watch_id)\n    435 {\n    436         int r;\n    437\n    438         if (!kfd_dbg_owns_dev_watch_id(pdd, watch_id))\n\nkfd_dbg_owns_dev_watch_id() doesn\u0027t check for negative values so if\nwatch_id is larger than INT_MAX it leads to a buffer overflow.\n(Negative shifts are undefined).\n\n    439                 return -EINVAL;\n    440\n    441         if (!pdd-\u003edev-\u003ekfd-\u003eshared_resources.enable_mes) {\n    442                 r = debug_lock_and_unmap(pdd-\u003edev-\u003edqm);\n    443                 if (r)\n    444                         return r;\n    445         }\n    446\n    447         amdgpu_gfx_off_ctrl(pdd-\u003edev-\u003eadev, false);\n--\u003e 448         pdd-\u003ewatch_points[watch_id] = pdd-\u003edev-\u003ekfd2kgd-\u003eclear_address_watch(\n    449                                                         pdd-\u003edev-\u003eadev,\n    450                                                         watch_id);\n\nv2: (as per, Jonathan Kim)\n - Add early watch_id \u003e= MAX_WATCH_ADDRESSES validation in the set path to\n   match the clear path.\n - Drop the redundant bounds check in kfd_dbg_owns_dev_watch_id()."
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This can cause invalid shifts and may access\\nmemory outside the watch_points array.\\n\\ndrm/amdkfd: Fix watch_id bounds checking in debug address watch v2\\n\\nFix this by checking that watch_id is within MAX_WATCH_ADDRESSES before\\nusing it.  Also use BIT(watch_id) to test and clear bits safely.\\n\\nThis keeps the behavior unchanged for valid watch IDs and avoids\\nundefined behavior for invalid ones.\\n\\nFixes the below:\\ndrivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c:448\\nkfd_dbg_trap_clear_dev_address_watch() error: buffer overflow\\n\u0027pdd-\u003ewatch_points\u0027 4 \u003c= u32max user_rl=\u00270-3,2147483648-u32max\u0027 uncapped\\n\\ndrivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c\\n    433 int kfd_dbg_trap_clear_dev_address_watch(struct kfd_process_device *pdd,\\n    434                                         uint32_t watch_id)\\n    435 {\\n    436         int r;\\n    437\\n    438         if (!kfd_dbg_owns_dev_watch_id(pdd, watch_id))\\n\\nkfd_dbg_owns_dev_watch_id() doesn\u0027t check for negative values so if\\nwatch_id is larger than INT_MAX it leads to a buffer overflow.\\n(Negative shifts are undefined).\\n\\n    439                 return -EINVAL;\\n    440\\n    441         if (!pdd-\u003edev-\u003ekfd-\u003eshared_resources.enable_mes) {\\n    442                 r = debug_lock_and_unmap(pdd-\u003edev-\u003edqm);\\n    443                 if (r)\\n    444                         return r;\\n    445         }\\n    446\\n    447         amdgpu_gfx_off_ctrl(pdd-\u003edev-\u003eadev, false);\\n--\u003e 448         pdd-\u003ewatch_points[watch_id] = pdd-\u003edev-\u003ekfd2kgd-\u003eclear_address_watch(\\n    449                                                         pdd-\u003edev-\u003eadev,\\n    450                                                         watch_id);\\n\\nv2: (as per, Jonathan Kim)\\n - Add early watch_id \u003e= MAX_WATCH_ADDRESSES validation in the set path to\\n   match the clear path.\\n - Drop the redundant bounds check in kfd_dbg_owns_dev_watch_id().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.128\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.75\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.14\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.4\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"6.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:28:38.911Z\"}}}",
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  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.