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CVE-2026-68434— serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms

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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于空函数指针解引用，可能导致内核崩溃。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.18% · P7

Affected Version Matrix 15

VendorProduct Version RangeStatus
Linux Linux 763d61ded752fbb3116efc951eff4363f237b7e0< bdaa8871b53fe9b1730ef64dda2fcd662fd83339 affected
c7d190bb07bf4e3b217c69370e94d1b4c80a40ad< f85a42fb90399dedcf81c146d09c07e4548b1e8c affected
0b3ed3fa227ba778cabed96e7f8d84addb8bdf9c< 4ea933a36a14bec19b71025cdd8407bafbd67ec1 affected
587afb06a5d1dc5092d3d9e9ac3ccf22094d50c6< 1096397c31f6bffa95e77bdd18fbca085be83e10 affected
977855894bca4b87afa50d21e3f3e85a5a0e901f< 600dcd548fb2b00a69f447684f52ba45d5a3540e affected
1cd54e217c6e2cdb794a897b2f855e13ffcee586< b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56 affected
9690e8a342632344984af72bc56b7a1fba61e6cb< 8cbad52ccfa6a7f089cfab34979bc6cc3bff25be affected
b1b4efea05a56c0995e4702a86d6624b4fdff32f< 7fb13fd7e9a59a37cd911efff83abe19e3ee029d affected
… +7 more rows
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I. Basic Information for CVE-2026-68434

Vulnerability Information
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Vulnerability Title
serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms Commit b1b4efea05a5 ("serial: 8250_mid: Disable DMA for selected platforms") replaced the dnv_board setup and exit callbacks with PTR_IF(false, ...), which evaluates to NULL. However, the three call sites in mid8250_probe() and mid8250_remove() unconditionally dereference these function pointers without NULL checks, causing a NULL pointer dereference (kernel oops) on any Denverton (DNV), Ice Lake Xeon D (ICX-D/CDF), or Snowridge (SNR) platform. Fix this by adding the missing NULL checks before calling the setup and exit callbacks.
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于空函数指针解引用，可能导致内核崩溃。
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 763d61ded752fbb3116efc951eff4363f237b7e0 ~ bdaa8871b53fe9b1730ef64dda2fcd662fd83339 -
Linux Linux 5.10.261 ~ 5.10.266 -

II. Public POCs for CVE-2026-68434

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III. Intelligence Information for CVE-2026-68434

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Patches & Fixes for CVE-2026-68434 (7)

Same Patch Batch · Linux · 2026-08-12 · 22 CVEs total

CVE-2026-68431 9.1 CRITICAL ksmbd: validate minimum PDU size for transform requests
CVE-2026-68432 8.8 HIGH vxlan: require CAP_NET_ADMIN in the device netns for changelink
CVE-2026-68433 8.6 HIGH libceph: bound get_version reply decode to front len
CVE-2026-68446 7.8 HIGH drm/vmwgfx: Validate vmw_surface_metadata::array_size
CVE-2026-68445 7.8 HIGH drm/vc4: Prevent shader BO mappings from becoming writable
CVE-2026-68440 7.8 HIGH net: txgbe: fix heap overflow when reading module EEPROM
CVE-2026-68442 7.8 HIGH btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps
CVE-2026-68447 7.1 HIGH drm/amdkfd: clamp v9 CRIU control stack checkpoint copy to BO size
CVE-2026-68450 btrfs: free mapping node on duplicate reloc root insert
CVE-2026-68429 drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()
CVE-2026-68449 ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
CVE-2026-68448 ovl: check access to copy_file_range source with src mounter creds
CVE-2026-68444 firmware: arm_ffa: Fix NULL dereference in ffa_partition_info_get()
CVE-2026-68443 hwmon: (gigabyte_waterforce) Stop device IO before calling hid_hw_stop
CVE-2026-68441 net/sched: Handle TC_ACT_REDIRECT from qdisc filter chains
CVE-2026-68439 wifi: mt76: mt7925: fix possible NULL-pointer deref in mt7925_mcu_bss_he_tlv()
CVE-2026-68438 smp: Make CSD lock acquisition atomic for debug mode
CVE-2026-68437 drm/imagination: Fit paired fragment job in the correct CCCB
CVE-2026-68436 drm/amd/display: use kvzalloc to allocate struct dc
CVE-2026-68435 LoongArch: Fix address space mismatch in kexec command line lookup

Showing top 20 of 22 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68434

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