CVE-2025-40323 (GCVE-0-2025-40323)

Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2025-12-08 00:46
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: fbcon: Set fb_display[i]->mode to NULL when the mode is released Recently, we discovered the following issue through syzkaller: BUG: KASAN: slab-use-after-free in fb_mode_is_equal+0x285/0x2f0 Read of size 4 at addr ff11000001b3c69c by task syz.xxx ... Call Trace: <TASK> dump_stack_lvl+0xab/0xe0 print_address_description.constprop.0+0x2c/0x390 print_report+0xb9/0x280 kasan_report+0xb8/0xf0 fb_mode_is_equal+0x285/0x2f0 fbcon_mode_deleted+0x129/0x180 fb_set_var+0xe7f/0x11d0 do_fb_ioctl+0x6a0/0x750 fb_ioctl+0xe0/0x140 __x64_sys_ioctl+0x193/0x210 do_syscall_64+0x5f/0x9c0 entry_SYSCALL_64_after_hwframe+0x76/0x7e Based on experimentation and analysis, during framebuffer unregistration, only the memory of fb_info->modelist is freed, without setting the corresponding fb_display[i]->mode to NULL for the freed modes. This leads to UAF issues during subsequent accesses. Here's an example of reproduction steps: 1. With /dev/fb0 already registered in the system, load a kernel module to register a new device /dev/fb1; 2. Set fb1's mode to the global fb_display[] array (via FBIOPUT_CON2FBMAP); 3. Switch console from fb to VGA (to allow normal rmmod of the ko); 4. Unload the kernel module, at this point fb1's modelist is freed, leaving a wild pointer in fb_display[]; 5. Trigger the bug via system calls through fb0 attempting to delete a mode from fb0. Add a check in do_unregister_framebuffer(): if the mode to be freed exists in fb_display[], set the corresponding mode pointer to NULL.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4ac18f0e6a6d599ca751c4cd98e522afc8e3d4eb (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 468f78276a37f4c6499385a4ce28f4f57be6655d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c079d42f70109512eee49123a843be91d8fa133f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < de89d19f4f30d9a8de87b9d08c1bd35cb70576d8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a1f3058930745d2b938b6b4f5bd9630dc74b26b7 (git)
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    Linux Linux Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/core/fbcon.c",
            "drivers/video/fbdev/core/fbmem.c",
            "include/linux/fbcon.h"
          ],
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              "status": "unaffected",
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbcon: Set fb_display[i]-\u003emode to NULL when the mode is released\n\nRecently, we discovered the following issue through syzkaller:\n\nBUG: KASAN: slab-use-after-free in fb_mode_is_equal+0x285/0x2f0\nRead of size 4 at addr ff11000001b3c69c by task syz.xxx\n...\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0xab/0xe0\n print_address_description.constprop.0+0x2c/0x390\n print_report+0xb9/0x280\n kasan_report+0xb8/0xf0\n fb_mode_is_equal+0x285/0x2f0\n fbcon_mode_deleted+0x129/0x180\n fb_set_var+0xe7f/0x11d0\n do_fb_ioctl+0x6a0/0x750\n fb_ioctl+0xe0/0x140\n __x64_sys_ioctl+0x193/0x210\n do_syscall_64+0x5f/0x9c0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nBased on experimentation and analysis, during framebuffer unregistration,\nonly the memory of fb_info-\u003emodelist is freed, without setting the\ncorresponding fb_display[i]-\u003emode to NULL for the freed modes. This leads\nto UAF issues during subsequent accesses. Here\u0027s an example of reproduction\nsteps:\n1. With /dev/fb0 already registered in the system, load a kernel module\n   to register a new device /dev/fb1;\n2. Set fb1\u0027s mode to the global fb_display[] array (via FBIOPUT_CON2FBMAP);\n3. Switch console from fb to VGA (to allow normal rmmod of the ko);\n4. Unload the kernel module, at this point fb1\u0027s modelist is freed, leaving\n   a wild pointer in fb_display[];\n5. Trigger the bug via system calls through fb0 attempting to delete a mode\n   from fb0.\n\nAdd a check in do_unregister_framebuffer(): if the mode to be freed exists\nin fb_display[], set the corresponding mode pointer to NULL."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-08T00:46:50.833Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4ac18f0e6a6d599ca751c4cd98e522afc8e3d4eb"
        },
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          "url": "https://git.kernel.org/stable/c/468f78276a37f4c6499385a4ce28f4f57be6655d"
        },
        {
          "url": "https://git.kernel.org/stable/c/c079d42f70109512eee49123a843be91d8fa133f"
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        {
          "url": "https://git.kernel.org/stable/c/a1f3058930745d2b938b6b4f5bd9630dc74b26b7"
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      ],
      "title": "fbcon: Set fb_display[i]-\u003emode to NULL when the mode is released",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40323",
    "datePublished": "2025-12-08T00:46:50.833Z",
    "dateReserved": "2025-04-16T07:20:57.186Z",
    "dateUpdated": "2025-12-08T00:46:50.833Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40323\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-08T01:16:05.067\",\"lastModified\":\"2025-12-08T18:26:19.900\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfbcon: Set fb_display[i]-\u003emode to NULL when the mode is released\\n\\nRecently, we discovered the following issue through syzkaller:\\n\\nBUG: KASAN: slab-use-after-free in fb_mode_is_equal+0x285/0x2f0\\nRead of size 4 at addr ff11000001b3c69c by task syz.xxx\\n...\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0xab/0xe0\\n print_address_description.constprop.0+0x2c/0x390\\n print_report+0xb9/0x280\\n kasan_report+0xb8/0xf0\\n fb_mode_is_equal+0x285/0x2f0\\n fbcon_mode_deleted+0x129/0x180\\n fb_set_var+0xe7f/0x11d0\\n do_fb_ioctl+0x6a0/0x750\\n fb_ioctl+0xe0/0x140\\n __x64_sys_ioctl+0x193/0x210\\n do_syscall_64+0x5f/0x9c0\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\nBased on experimentation and analysis, during framebuffer unregistration,\\nonly the memory of fb_info-\u003emodelist is freed, without setting the\\ncorresponding fb_display[i]-\u003emode to NULL for the freed modes. This leads\\nto UAF issues during subsequent accesses. Here\u0027s an example of reproduction\\nsteps:\\n1. With /dev/fb0 already registered in the system, load a kernel module\\n   to register a new device /dev/fb1;\\n2. Set fb1\u0027s mode to the global fb_display[] array (via FBIOPUT_CON2FBMAP);\\n3. Switch console from fb to VGA (to allow normal rmmod of the ko);\\n4. Unload the kernel module, at this point fb1\u0027s modelist is freed, leaving\\n   a wild pointer in fb_display[];\\n5. Trigger the bug via system calls through fb0 attempting to delete a mode\\n   from fb0.\\n\\nAdd a check in do_unregister_framebuffer(): if the mode to be freed exists\\nin fb_display[], set the corresponding mode pointer to NULL.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/468f78276a37f4c6499385a4ce28f4f57be6655d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4ac18f0e6a6d599ca751c4cd98e522afc8e3d4eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a1f3058930745d2b938b6b4f5bd9630dc74b26b7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c079d42f70109512eee49123a843be91d8fa133f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de89d19f4f30d9a8de87b9d08c1bd35cb70576d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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