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CVE-2025-68797— char: applicom: fix NULL pointer dereference in ac_ioctl

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ac_ioctl函数中cmd为6时未验证IndexCard，可能导致空指针取消引用。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 5a6240804fb7bbd4f5f6e706955248a6f4c1abbc affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d1b0452280029d05a98c75631131ee61c0b0d084 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 0b8b353e09888bccee405e0dd6feafb60360f478 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d285517429a75423789e6408653e57b6fdfc8e54 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 74883565c621eec6cd2e35fe6d27454cf2810c23 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f83e3e9f89181b42f6076a115d767a7552c4a39e affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 82d12088c297fa1cef670e1718b3d24f414c23f7 affected
2.6.12 affected
… +8 more rows
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I. Basic Information for CVE-2025-68797

Vulnerability Information
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Vulnerability Title
char: applicom: fix NULL pointer dereference in ac_ioctl
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: char: applicom: fix NULL pointer dereference in ac_ioctl Discovered by Atuin - Automated Vulnerability Discovery Engine. In ac_ioctl, the validation of IndexCard and the check for a valid RamIO pointer are skipped when cmd is 6. However, the function unconditionally executes readb(apbs[IndexCard].RamIO + VERS) at the end. If cmd is 6, IndexCard may reference a board that does not exist (where RamIO is NULL), leading to a NULL pointer dereference. Fix this by skipping the readb access when cmd is 6, as this command is a global information query and does not target a specific board context.
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ac_ioctl函数中cmd为6时未验证IndexCard，可能导致空指针取消引用。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 5a6240804fb7bbd4f5f6e706955248a6f4c1abbc -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2025-68797

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III. Intelligence Information for CVE-2025-68797

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Same Patch Batch · Linux · 2026-01-13 · 93 CVEs total

CVE-2025-68811 9.8 CRITICAL svcrdma: use rc_pageoff for memcpy byte offset
CVE-2025-68794 9.8 CRITICAL iomap: adjust read range correctly for non-block-aligned positions
CVE-2025-68817 9.8 CRITICAL ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency
CVE-2025-68775 9.8 CRITICAL net/handshake: duplicate handshake cancellations leak socket
CVE-2025-71068 9.8 CRITICAL svcrdma: bound check rq_pages index in inline path
CVE-2025-71095 9.1 CRITICAL net: stmmac: fix the crash issue for zero copy XDP_TX action
CVE-2025-68809 9.1 CRITICAL ksmbd: vfs: fix race on m_flags in vfs_cache
CVE-2025-71093 9.1 CRITICAL e1000: fix OOB in e1000_tbi_should_accept()
CVE-2025-68818 8.8 HIGH scsi: Revert "scsi: qla2xxx: Perform lockless command completion in abort path"
CVE-2025-71072 8.2 HIGH shmem: fix recovery on rename failures
CVE-2025-68799 8.1 HIGH caif: fix integer underflow in cffrml_receive()
CVE-2025-68803 8.0 HIGH NFSD: NFSv4 file creation neglects setting ACL
CVE-2025-68793 7.8 HIGH drm/amdgpu: fix a job->pasid access race in gpu recovery
CVE-2025-68792 7.8 HIGH tpm2-sessions: Fix out of range indexing in name_size
CVE-2025-71078 7.8 HIGH powerpc/64s/slb: Fix SLB multihit issue during SLB preload
CVE-2025-68801 7.8 HIGH mlxsw: spectrum_router: Fix neighbour use-after-free
CVE-2025-68795 7.8 HIGH ethtool: Avoid overflowing userspace buffer on stats query
CVE-2025-68805 7.8 HIGH fuse: fix io-uring list corruption for terminated non-committed requests
CVE-2025-68808 7.8 HIGH media: vidtv: initialize local pointers upon transfer of memory ownership
CVE-2025-68810 7.8 HIGH KVM: Disallow toggling KVM_MEM_GUEST_MEMFD on an existing memslot

Showing top 20 of 93 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-68797

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