CVE-2025-38449— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于帧缓冲区未正确获取GEM句柄引用，可能导致段错误。
可能的 ATT&CK 技术 1 AI
T1211 · Exploitation for Stealth影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 319c933c71f3dbdb2b3274d1634d3494c70efa06< cb4c956a15f8b7f870649454771fc3761f504b5f |
affected |
319c933c71f3dbdb2b3274d1634d3494c70efa06< 08480e285c6a82ce689008d643e4a51db0aaef8b |
affected | ||
319c933c71f3dbdb2b3274d1634d3494c70efa06< 3cf520d9860d4ec9f7f32068825da31f18dd3f25 |
affected | ||
319c933c71f3dbdb2b3274d1634d3494c70efa06< 5307dce878d4126e1b375587318955bd019c3741 |
affected | ||
3.12 |
affected | ||
< 3.12 |
unaffected | ||
6.6.99≤ 6.6.* |
unaffected | ||
6.12.39≤ 6.12.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2025-38449 基础信息
漏洞信息
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Vulnerability Title
drm/gem: Acquire references on GEM handles for framebuffers
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
drm/gem: Acquire references on GEM handles for framebuffers
A GEM handle can be released while the GEM buffer object is attached
to a DRM framebuffer. This leads to the release of the dma-buf backing
the buffer object, if any. [1] Trying to use the framebuffer in further
mode-setting operations leads to a segmentation fault. Most easily
happens with driver that use shadow planes for vmap-ing the dma-buf
during a page flip. An example is shown below.
[ 156.791968] ------------[ cut here ]------------
[ 156.796830] WARNING: CPU: 2 PID: 2255 at drivers/dma-buf/dma-buf.c:1527 dma_buf_vmap+0x224/0x430
[...]
[ 156.942028] RIP: 0010:dma_buf_vmap+0x224/0x430
[ 157.043420] Call Trace:
[ 157.045898] <TASK>
[ 157.048030] ? show_trace_log_lvl+0x1af/0x2c0
[ 157.052436] ? show_trace_log_lvl+0x1af/0x2c0
[ 157.056836] ? show_trace_log_lvl+0x1af/0x2c0
[ 157.061253] ? drm_gem_shmem_vmap+0x74/0x710
[ 157.065567] ? dma_buf_vmap+0x224/0x430
[ 157.069446] ? __warn.cold+0x58/0xe4
[ 157.073061] ? dma_buf_vmap+0x224/0x430
[ 157.077111] ? report_bug+0x1dd/0x390
[ 157.080842] ? handle_bug+0x5e/0xa0
[ 157.084389] ? exc_invalid_op+0x14/0x50
[ 157.088291] ? asm_exc_invalid_op+0x16/0x20
[ 157.092548] ? dma_buf_vmap+0x224/0x430
[ 157.096663] ? dma_resv_get_singleton+0x6d/0x230
[ 157.101341] ? __pfx_dma_buf_vmap+0x10/0x10
[ 157.105588] ? __pfx_dma_resv_get_singleton+0x10/0x10
[ 157.110697] drm_gem_shmem_vmap+0x74/0x710
[ 157.114866] drm_gem_vmap+0xa9/0x1b0
[ 157.118763] drm_gem_vmap_unlocked+0x46/0xa0
[ 157.123086] drm_gem_fb_vmap+0xab/0x300
[ 157.126979] drm_atomic_helper_prepare_planes.part.0+0x487/0xb10
[ 157.133032] ? lockdep_init_map_type+0x19d/0x880
[ 157.137701] drm_atomic_helper_commit+0x13d/0x2e0
[ 157.142671] ? drm_atomic_nonblocking_commit+0xa0/0x180
[ 157.147988] drm_mode_atomic_ioctl+0x766/0xe40
[...]
[ 157.346424] ---[ end trace 0000000000000000 ]---
Acquiring GEM handles for the framebuffer's GEM buffer objects prevents
this from happening. The framebuffer's cleanup later puts the handle
references.
Commit 1a148af06000 ("drm/gem-shmem: Use dma_buf from GEM object
instance") triggers the segmentation fault easily by using the dma-buf
field more widely. The underlying issue with reference counting has
been present before.
v2:
- acquire the handle instead of the BO (Christian)
- fix comment style (Christian)
- drop the Fixes tag (Christian)
- rename err_ gotos
- add missing Link tag
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于帧缓冲区未正确获取GEM句柄引用，可能导致段错误。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2025-38449 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2025-07-25 · 共 114 条
| CVE-2025-38429 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38411 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38430 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38439 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38365 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38377 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38367 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38437 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38375 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38395 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38386 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38422 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38434 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38412 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38382 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38447 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38398 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38408 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38396 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38435 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 114 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-38449
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