CVE-2026-89821— drm/amd/display: avoid divide-by-zero in __is_lut_linear()
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.
在 Linux 内核中，已修复以下漏洞： drm/amd/display：在 中避免除零错误 函数通过以下公式计算 LUT 每个条目的预期值： 如果该函数被调用时 LUT 只有一个条目（即 为 1），则 等于 0，导致内核发生除零异常（#DE）。由于少于两个条目的 LUT 根本无法描述线性映射，因此应在执行除法前提前返回 ，从而避免除零错误。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 086247a4b2fba49800b27807f22bb894cd8363fb< 2320626425f3af3a25b8afb6876f205b1c6d4e64 |
affected |
086247a4b2fba49800b27807f22bb894cd8363fb< d1e06d5dc8f12451ce71dc068342660a34476084 |
affected | ||
086247a4b2fba49800b27807f22bb894cd8363fb< c127ace7af2b40107947a6504391f94d6fd21734 |
affected | ||
086247a4b2fba49800b27807f22bb894cd8363fb< 4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44 |
affected | ||
086247a4b2fba49800b27807f22bb894cd8363fb< 5f18cd1ba873e751bf5547407ad44ea34adfbe2f |
affected | ||
086247a4b2fba49800b27807f22bb894cd8363fb< ee28fafb50f58b847509b5240b431ddec673bdfe |
affected | ||
086247a4b2fba49800b27807f22bb894cd8363fb< 15ee43aad0df43dfd1dbb32e7d5b951745c4b87f |
affected | ||
086247a4b2fba49800b27807f22bb894cd8363fb< 4f40873f8a4107df2b9c8e68c947c4fd0cd519d2 |
affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2026-89821
Vulnerability Information
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Vulnerability Title
drm/amd/display: avoid divide-by-zero in __is_lut_linear()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: avoid divide-by-zero in __is_lut_linear()
__is_lut_linear() computes the expected value of each entry with
expected = i * MAX_DRM_LUT_VALUE / (size - 1);
If it is ever called with a single-entry LUT, size - 1 is zero and the
kernel takes a divide error (#DE). A LUT with fewer than two entries
cannot describe a linear mapping anyway, so return false early instead
of dividing by zero.
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
Affected Products
II. Public POCs for CVE-2026-89821
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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Other References for CVE-2026-89821 (8)
Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total
| CVE-2026-90048 | 9.8 CRITICAL | fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list() |
| CVE-2026-90012 | 9.8 CRITICAL | spi: Fix DMA mapping ownership on partial map failure |
| CVE-2026-89970 | 9.8 CRITICAL | nvmet-auth: Synchronize timeout work during SQ teardown |
| CVE-2026-89857 | 9.8 CRITICAL | scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject |
| CVE-2026-89969 | 9.8 CRITICAL | nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU |
| CVE-2026-89847 | 9.8 CRITICAL | scsi: qla2xxx: Avoid double completion in async IOCB timeout |
| CVE-2026-89972 | 9.8 CRITICAL | nvme: add missing SRCU grace period in error path |
| CVE-2026-89990 | 9.8 CRITICAL | ceph: lock mutex in ceph_mds_check_access() |
| CVE-2026-90036 | 9.8 CRITICAL | NFSD: Prevent client use-after-free during blocked-lock reaping |
| CVE-2026-90038 | 9.8 CRITICAL | NFSD: Prevent client use-after-free during export state revocation |
| CVE-2026-90037 | 9.8 CRITICAL | NFSD: Prevent client use-after-free during close_lru reaping |
| CVE-2026-89788 | 9.8 CRITICAL | ksmbd: fix tree connection use-after-free in smb2_tree_connect() |
| CVE-2026-89783 | 9.8 CRITICAL | xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full |
| CVE-2026-90042 | 9.8 CRITICAL | ceph: properly decrypt filenames in vmalloc() buffers |
| CVE-2026-89778 | 9.8 CRITICAL | isofs: fix out-of-bounds page array access on empty zisofs block |
| CVE-2026-89915 | 9.3 CRITICAL | KVM: arm64: Remove VM-wide VNCR mapping counter |
| CVE-2026-90049 | 9.3 CRITICAL | net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy() |
| CVE-2026-89775 | 9.3 CRITICAL | KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation |
| CVE-2026-89916 | 9.3 CRITICAL | KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry |
| CVE-2026-89930 | 9.3 CRITICAL | KVM: nVMX: Service local TLB flushes on failed nested VM-Enter |
Showing top 20 of 276 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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Same vendor: Linux
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CVE-2026-98385
sched/cache: Decouple sched_cache_group from mm to fix UAF -
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
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bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
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bpf: Reject dev-bound-only programs on other devices -
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V. Comments for CVE-2026-89821
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