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CVE-2026-99083— ksmbd: fix heap out-of-bounds write in krb5_authenticate()

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，以下漏洞已得到修复： ksmbd：修复 krb5_authenticate() 中的堆越界写漏洞 在 krb5_authenticate() 函数中，程序会计算 out_len 以确定 response_buf 中可用于接收传入的 Kerberos AP-REP 令牌的剩余头部空间。然而，当 SMB2_SESSION_SETUP 作为复合 SMB2 请求中的非首个元素被处理时，该计算遗漏了 work->next_smb2_rsp_hdr_off 这一偏移量。 这导致 out_len 高估了剩

AI Predicted 8.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 59c6dcc5dd9dafe764ca0d40525933b2be69b059 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 80af1bde97d5a85ad6f2c40ca894ccc8fa75a27a affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 517404e157395d0f8da125ca956c566895dfcd06 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4722d06b2907585074252061b1024a696c1cfc23 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 23a0be6a84a38ac169eeab49017934e8e27c65f0 affected
< 6.6.160 affected
< 6.12.114 affected
< 6.18.58 affected
… +6 more rows
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I. Basic Information for CVE-2026-99083

Vulnerability Information
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Vulnerability Title
ksmbd: fix heap out-of-bounds write in krb5_authenticate()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix heap out-of-bounds write in krb5_authenticate() In krb5_authenticate(), out_len is calculated to determine available headroom in response_buf for the incoming Kerberos AP-REP token. However, when SMB2_SESSION_SETUP is processed as a non-first element of a compounded SMB2 request, the calculation omits work->next_smb2_rsp_hdr_off. This causes out_len to overstate remaining buffer headroom by the cumulative size of prior responses in the compound chain. Consequently, the length check in ksmbd_krb5_authenticate() (*out_len <= resp->spnego_blob_len) passes erroneously, allowing memcpy() to write the AP-REP blob past the end of response_buf into adjacent kernel heap memory. Fix this by subtracting work->next_smb2_rsp_hdr_off when computing out_len, ensuring it accurately reflects physical remaining buffer space.
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 59c6dcc5dd9dafe764ca0d40525933b2be69b059 -
Linux Linux 6.6.160 ~ 6.6.* -

II. Public POCs for CVE-2026-99083

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III. Intelligence Information for CVE-2026-99083

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Patches & Fixes for CVE-2026-99083 (5)

Same Patch Batch · Linux · 2026-10-23 · 218 CVEs total

CVE-2026-98937 perf/core: Check kernel access when kernel callchains are requested
CVE-2026-98950 flow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()
CVE-2026-98949 drm/imagination: Fix reference and vm_bo handling in remap()
CVE-2026-98948 mlxsw: spectrum_flower: Fix port range register leak in tmplt_create()
CVE-2026-98947 vsock: Fix memory leak in vmci_transport_recv_dgram_cb()
CVE-2026-98946 drm/vc4: Disable the V3D interrupt across runtime suspend
CVE-2026-98945 HID: steam: Rearrange teardown sequence
CVE-2026-98944 HID: steam: Refactor registration
CVE-2026-98943 HID: steam: Clean up locking
CVE-2026-98942 sched_ext: Build the cid tables privately and publish them with RCU
CVE-2026-98941 ext4: don't enable large folios on encrypted inodes
CVE-2026-98940 ASoC: qcom: lpass-cpu: use DAI table index for playback constraints
CVE-2026-98939 x86/mm: Drop unnecessary PMD page copy when freeing
CVE-2026-98938 rust: irq: pass RegistrationInner as cookie to request_irq
CVE-2026-98926 drm/amd/display: Remove sink usage from DPMS
CVE-2026-98929 macsec: initialize SecY before registering the netdevice
CVE-2026-98928 KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2
CVE-2026-98927 KVM: arm64: nv: Fix life cycle of the nested_mmus array
CVE-2026-98930 KVM: s390: Fix IRQ injection with SIGP Stop and Store Status
CVE-2026-98925 bpf, sockmap: Fix self-redirect copied_seq double-counting

Showing top 20 of 218 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-99083

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