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CVE-2026-31603— staging: sm750fb: fix division by zero in ps_to_hz()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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staging sm750fb驱动ps_to_hz()函数未验证pixclock非零，导致除零错误。

AI Predicted 7.8 Difficulty: Easy EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 81dee67e215b23f0c98182eece122b906d35765a< 124a43550db8a74eef080cd4573a4904efe67029 affected
81dee67e215b23f0c98182eece122b906d35765a< b285a8f3bbb821a93eb37c2740a68ca1d7112a59 affected
81dee67e215b23f0c98182eece122b906d35765a< 3300b049693138852a4c6738b5f1194a1ee91ddd affected
81dee67e215b23f0c98182eece122b906d35765a< 779412e0e391fd4a0d12e1d1adaa7bf043de62d7 affected
81dee67e215b23f0c98182eece122b906d35765a< 2f640c6043aeab31a2f607d7605271860c3b11df affected
81dee67e215b23f0c98182eece122b906d35765a< 1412ba36597a82e928f20047f41d6c6582dafe8a affected
81dee67e215b23f0c98182eece122b906d35765a< 6144895a4335a2491c282931f1f2fa610b86339f affected
81dee67e215b23f0c98182eece122b906d35765a< daf6733bd7c4c5015b431739ac29b0e29021096b affected
… +12 more rows
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I. Basic Information for CVE-2026-31603

Vulnerability Information
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Vulnerability Title
staging: sm750fb: fix division by zero in ps_to_hz()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: staging: sm750fb: fix division by zero in ps_to_hz() ps_to_hz() is called from hw_sm750_crtc_set_mode() without validating that pixclock is non-zero. A zero pixclock passed via FBIOPUT_VSCREENINFO causes a division by zero. Fix by rejecting zero pixclock in lynxfb_ops_check_var(), consistent with other framebuffer drivers.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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staging sm750fb驱动ps_to_hz()函数未验证pixclock非零，导致除零错误。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 81dee67e215b23f0c98182eece122b906d35765a ~ 124a43550db8a74eef080cd4573a4904efe67029 -
Linux Linux 4.1 -

II. Public POCs for CVE-2026-31603

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III. Intelligence Information for CVE-2026-31603

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Patches & Fixes for CVE-2026-31603 (5)

Same Patch Batch · Linux · 2026-04-24 · 138 CVEs total

CVE-2026-31607 9.8 CRITICAL usbip: validate number_of_packets in usbip_pack_ret_submit()
CVE-2026-31608 9.8 CRITICAL smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list
CVE-2026-31633 9.8 CRITICAL rxrpc: Fix integer overflow in rxgk_verify_response()
CVE-2026-31649 9.8 CRITICAL net: stmmac: fix integer underflow in chain mode
CVE-2026-31669 9.8 CRITICAL mptcp: fix slab-use-after-free in __inet_lookup_established
CVE-2026-31668 9.8 CRITICAL seg6: separate dst_cache for input and output paths in seg6 lwtunnel
CVE-2026-31589 9.8 CRITICAL mm: call ->free_folio() directly in folio_unmap_invalidate()
CVE-2026-31609 9.8 CRITICAL smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
CVE-2026-31536 9.8 CRITICAL smb: server: let send_done handle a completion without IB_SEND_SIGNALED
CVE-2026-31657 9.8 CRITICAL batman-adv: hold claim backbone gateways by reference
CVE-2026-31637 9.8 CRITICAL rxrpc: reject undecryptable rxkad response tickets
CVE-2026-31659 9.8 CRITICAL batman-adv: reject oversized global TT response buffers
CVE-2026-31636 9.1 CRITICAL rxrpc: fix RESPONSE authenticator parser OOB read
CVE-2026-31629 8.8 HIGH nfc: llcp: add missing return after LLCP_CLOSED checks
CVE-2026-31570 8.8 HIGH can: gw: fix OOB heap access in cgw_csum_crc8_rel()
CVE-2026-31558 8.8 HIGH LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust
CVE-2026-31553 8.8 HIGH KVM: arm64: Fix the descriptor address in __kvm_at_swap_desc()
CVE-2026-31622 8.8 HIGH NFC: digital: Bounds check NFC-A cascade depth in SDD response handler
CVE-2026-31588 8.8 HIGH KVM: x86: Use scratch field in MMIO fragment to hold small write values
CVE-2026-31611 8.6 HIGH ksmbd: require 3 sub-authorities before reading sub_auth[2]

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31603

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