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	"document":{
		"aggregate_severity":{
			"namespace":"https://nvd.nist.gov/vuln-metrics/cvss",
			"text":"HIGH"
		},
		"category":"csaf_vex",
		"csaf_version":"2.0",
		"distribution":{
			"tlp":{
				"label":"WHITE",
				"url":"https:/www.first.org/tlp/"
			}
		},
		"lang":"en",
		"notes":[
			{
				"text":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/gem: Acquire references on GEM handles for framebuffers\n\nA GEM handle can be released while the GEM buffer object is attached\nto a DRM framebuffer. This leads to the release of the dma-buf backing\nthe buffer object, if any. [1] Trying to use the framebuffer in further\nmode-setting operations leads to a segmentation fault. Most easily\nhappens with driver that use shadow planes for vmap-ing the dma-buf\nduring a page flip. An example is shown below.\n\n[  156.791968] ------------[ cut here ]------------\n[  156.796830] WARNING: CPU: 2 PID: 2255 at drivers/dma-buf/dma-buf.c:1527 dma_buf_vmap+0x224/0x430\n[...]\n[  156.942028] RIP: 0010:dma_buf_vmap+0x224/0x430\n[  157.043420] Call Trace:\n[  157.045898]  <TASK>\n[  157.048030]  ? show_trace_log_lvl+0x1af/0x2c0\n[  157.052436]  ? show_trace_log_lvl+0x1af/0x2c0\n[  157.056836]  ? show_trace_log_lvl+0x1af/0x2c0\n[  157.061253]  ? drm_gem_shmem_vmap+0x74/0x710\n[  157.065567]  ? dma_buf_vmap+0x224/0x430\n[  157.069446]  ? __warn.cold+0x58/0xe4\n[  157.073061]  ? dma_buf_vmap+0x224/0x430\n[  157.077111]  ? report_bug+0x1dd/0x390\n[  157.080842]  ? handle_bug+0x5e/0xa0\n[  157.084389]  ? exc_invalid_op+0x14/0x50\n[  157.088291]  ? asm_exc_invalid_op+0x16/0x20\n[  157.092548]  ? dma_buf_vmap+0x224/0x430\n[  157.096663]  ? dma_resv_get_singleton+0x6d/0x230\n[  157.101341]  ? __pfx_dma_buf_vmap+0x10/0x10\n[  157.105588]  ? __pfx_dma_resv_get_singleton+0x10/0x10\n[  157.110697]  drm_gem_shmem_vmap+0x74/0x710\n[  157.114866]  drm_gem_vmap+0xa9/0x1b0\n[  157.118763]  drm_gem_vmap_unlocked+0x46/0xa0\n[  157.123086]  drm_gem_fb_vmap+0xab/0x300\n[  157.126979]  drm_atomic_helper_prepare_planes.part.0+0x487/0xb10\n[  157.133032]  ? lockdep_init_map_type+0x19d/0x880\n[  157.137701]  drm_atomic_helper_commit+0x13d/0x2e0\n[  157.142671]  ? drm_atomic_nonblocking_commit+0xa0/0x180\n[  157.147988]  drm_mode_atomic_ioctl+0x766/0xe40\n[...]\n[  157.346424] ---[ end trace 0000000000000000 ]---\n\nAcquiring GEM handles for the framebuffer's GEM buffer objects prevents\nthis from happening. The framebuffer's cleanup later puts the handle\nreferences.\n\nCommit 1a148af06000 (\"drm/gem-shmem: Use dma_buf from GEM object\ninstance\") triggers the segmentation fault easily by using the dma-buf\nfield more widely. The underlying issue with reference counting has\nbeen present before.\n\nv2:\n- acquire the handle instead of the BO (Christian)\n- fix comment style (Christian)\n- drop the Fixes tag (Christian)\n- rename err_ gotos\n- add missing Link tag",
				"category":"general",
				"title":"Synopsis"
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		"references":[
			{
				"summary":"nvd cve",
				"category":"external",
				"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38449"
			},
			{
				"summary":"CVE-2025-38449 vex file",
				"category":"self",
				"url":"https://repo.openeuler.org/security/data/csaf/cve/2025/csaf-openeuler-cve-2025-38449.json"
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				"summary":"openEuler-SA-2025-2533",
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			},
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				"summary":"CVE-2025-38449",
				"category":"self",
				"url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2025-38449&packageName=kernel"
			}
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		"title":"openEuler cve CVE-2025-38449",
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			"revision_history":[
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					"summary":"Initial",
					"number":"1.0.0"
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				"engine":{
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				}
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			"current_release_date":"2025-10-29T16:44:41+08:00",
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			}
		]
	},
	"vulnerabilities":[
		{
			"cve":"CVE-2025-38449",
			"notes":[
				{
					"text":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/gem: Acquire references on GEM handles for framebuffers\n\nA GEM handle can be released while the GEM buffer object is attached\nto a DRM framebuffer. This leads to the release of the dma-buf backing\nthe buffer object, if any. [1] Trying to use the framebuffer in further\nmode-setting operations leads to a segmentation fault. Most easily\nhappens with driver that use shadow planes for vmap-ing the dma-buf\nduring a page flip. An example is shown below.\n\n[  156.791968] ------------[ cut here ]------------\n[  156.796830] WARNING: CPU: 2 PID: 2255 at drivers/dma-buf/dma-buf.c:1527 dma_buf_vmap+0x224/0x430\n[...]\n[  156.942028] RIP: 0010:dma_buf_vmap+0x224/0x430\n[  157.043420] Call Trace:\n[  157.045898]  <TASK>\n[  157.048030]  ? show_trace_log_lvl+0x1af/0x2c0\n[  157.052436]  ? show_trace_log_lvl+0x1af/0x2c0\n[  157.056836]  ? show_trace_log_lvl+0x1af/0x2c0\n[  157.061253]  ? drm_gem_shmem_vmap+0x74/0x710\n[  157.065567]  ? dma_buf_vmap+0x224/0x430\n[  157.069446]  ? __warn.cold+0x58/0xe4\n[  157.073061]  ? dma_buf_vmap+0x224/0x430\n[  157.077111]  ? report_bug+0x1dd/0x390\n[  157.080842]  ? handle_bug+0x5e/0xa0\n[  157.084389]  ? exc_invalid_op+0x14/0x50\n[  157.088291]  ? asm_exc_invalid_op+0x16/0x20\n[  157.092548]  ? dma_buf_vmap+0x224/0x430\n[  157.096663]  ? dma_resv_get_singleton+0x6d/0x230\n[  157.101341]  ? __pfx_dma_buf_vmap+0x10/0x10\n[  157.105588]  ? __pfx_dma_resv_get_singleton+0x10/0x10\n[  157.110697]  drm_gem_shmem_vmap+0x74/0x710\n[  157.114866]  drm_gem_vmap+0xa9/0x1b0\n[  157.118763]  drm_gem_vmap_unlocked+0x46/0xa0\n[  157.123086]  drm_gem_fb_vmap+0xab/0x300\n[  157.126979]  drm_atomic_helper_prepare_planes.part.0+0x487/0xb10\n[  157.133032]  ? lockdep_init_map_type+0x19d/0x880\n[  157.137701]  drm_atomic_helper_commit+0x13d/0x2e0\n[  157.142671]  ? drm_atomic_nonblocking_commit+0xa0/0x180\n[  157.147988]  drm_mode_atomic_ioctl+0x766/0xe40\n[...]\n[  157.346424] ---[ end trace 0000000000000000 ]---\n\nAcquiring GEM handles for the framebuffer's GEM buffer objects prevents\nthis from happening. The framebuffer's cleanup later puts the handle\nreferences.\n\nCommit 1a148af06000 (\"drm/gem-shmem: Use dma_buf from GEM object\ninstance\") triggers the segmentation fault easily by using the dma-buf\nfield more widely. The underlying issue with reference counting has\nbeen present before.\n\nv2:\n- acquire the handle instead of the BO (Christian)\n- fix comment style (Christian)\n- drop the Fixes tag (Christian)\n- rename err_ gotos\n- add missing Link tag",
					"category":"description",
					"title":"Vulnerability Description"
				}
			],
			"product_status":{
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			},
			"remediations":[
				{
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					],
					"details":"kernel security update",
					"category":"vendor_fix",
					"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-2533"
				}
			],
			"scores":[
				{
					"cvss_v3":{
						"baseSeverity":"MEDIUM",
						"baseScore":6.6,
						"vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H",
						"version":"3.1"
					},
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					]
				}
			],
			"threats":[
				{
					"details":"High",
					"category":"impact"
				}
			],
			"title":"CVE-2025-38449"
		}
	]
}