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CVE-2026-46209— drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs()

CVSS 7.8 · High EPSS 0.01% · P2

Affected Version Matrix 12

VendorProductVersion RangeStatus
LinuxLinux4c3dbb2c312c9fafbac30d98c523b8b1f3455d78< 6b992591e04f2cce813bcf239b354f375bbf84d3affected
4c3dbb2c312c9fafbac30d98c523b8b1f3455d78< 1da4ab7189f1064b3b712b388772c008b4d82580affected
4c3dbb2c312c9fafbac30d98c523b8b1f3455d78< 1a17ea9861e89585361caa8bc231bd22dc6dbe7daffected
4c3dbb2c312c9fafbac30d98c523b8b1f3455d78< c5fc49d8470c5ebf3b41607600f277158f159950affected
4c3dbb2c312c9fafbac30d98c523b8b1f3455d78< 3d4c2268bd7243c3780fe32bf24ff876da272acfaffected
4.14affected
< 4.14unaffected
6.6.140≤ 6.6.*unaffected
… +4 more rows
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I. Basic Information for CVE-2026-46209

Vulnerability Information
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Vulnerability Title
drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs() drm_gem_fb_init_with_funcs() computes sub-sampled plane dimensions using plain integer division: unsigned int width = mode_cmd->width / (i ? info->hsub : 1); unsigned int height = mode_cmd->height / (i ? info->vsub : 1); However, the ioctl-level framebuffer_check() in drm_framebuffer.c uses drm_format_info_plane_width/height() which round up dimensions via DIV_ROUND_UP(). This inconsistency corrupts the subsequent GEM object size check for certain pixel format and dimension combinations. For example, with NV12 (vsub=2) and a 1-pixel-tall framebuffer the GEM size validation path sees height=0 instead of height=1. The expression (height - 1) then wraps to UINT_MAX as an unsigned int, causing min_size to overflow and wrap back to a small value. A tiny GEM object therefore passes the size guard, yet when the GPU accesses the chroma plane it will read or write memory beyond the object's bounds. Fix by replacing the open-coded divisions with drm_format_info_plane_width() and drm_format_info_plane_height(), which use DIV_ROUND_UP() and match the calculation already used in framebuffer_check().
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
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drm/gem中平面尺寸计算不一致，可能导致GEM对象大小检查错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 4c3dbb2c312c9fafbac30d98c523b8b1f3455d78 ~ 6b992591e04f2cce813bcf239b354f375bbf84d3 -
LinuxLinux 4.14 -

II. Public POCs for CVE-2026-46209

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III. Intelligence Information for CVE-2026-46209

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Patches & Fixes for CVE-2026-46209 (5)

Same Patch Batch · Linux · 2026-05-28 · 138 CVEs total

CVE-2026-461359.8 CRITICALnvmet-tcp: fix race between ICReq handling and queue teardown
CVE-2026-461379.8 CRITICALmptcp: pm: ADD_ADDR rtx: fix potential data-race
CVE-2026-461959.8 CRITICALsmb: client: validate dacloffset before building DACL pointers
CVE-2026-461159.8 CRITICALblock: add pgmap check to biovec_phys_mergeable
CVE-2026-461859.1 CRITICALsmb/client: fix out-of-bounds read in symlink_data()
CVE-2026-461199.1 CRITICALlibceph: Fix slab-out-of-bounds access in auth message processing
CVE-2026-461559.1 CRITICALsmb/client: fix out-of-bounds read in smb2_compound_op()
CVE-2026-461668.8 HIGHwifi: mac80211: use safe list iteration in radar detect work
CVE-2026-461988.8 HIGHbatman-adv: fix integer overflow on buff_pos
CVE-2026-461258.8 HIGHwifi: mac80211: remove station if connection prep fails
CVE-2026-462388.8 HIGHbatman-adv: stop caching unowned originator pointers in BAT IV
CVE-2026-461748.8 HIGHx86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache
CVE-2026-461138.8 HIGHKVM: x86: Fix shadow paging use-after-free due to unexpected GFN
CVE-2026-461528.8 HIGHwifi: mac80211: drop stray 'static' from fast-RX rx_result
CVE-2026-462128.8 HIGHbatman-adv: bla: prevent use-after-free when deleting claims
CVE-2026-462328.1 HIGHHID: playstation: Clamp num_touch_reports
CVE-2026-461388.1 HIGHBluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
CVE-2026-462107.8 HIGHmedia: iris: fix use-after-free of fmt_src during MBPF check
CVE-2026-462277.8 HIGHsctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL
CVE-2026-462057.8 HIGHstaging: media: atomisp: Disallow all private IOCTLs

Showing top 20 of 138 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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