CVE-2026-98856— kprobes: Skip disarmed probes when checking optkprobe overlap
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： kprobes：在检查 optkprobe 重叠时跳过已解除武装的探针 在 x86 架构上，位于地址 A 的 optkprobe 会用一条跳转指令替换五个字节。如果存在一个已禁用的探针 B 位于 A+2，那么当尝试在 A+4 处武装新探针 C 时， 函数会在遇到 B 时停止。这导致地址 A 处的 optkprobe 仍保持优化状态： 探针 C 的 INT3 指令会覆盖 A 处跳转指令位移的最后一个字节，从而导致程序跳转到错误的地址。虽然探针 B 在解除武装（disarm
Possible ATT&CK Techniques 2 AI
T1499 · Endpoint Denial of Service T1068 · Exploitation for Privilege EscalationAffected Version Matrix 10
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | afd66255b9a48f5851326ddae50e2203fbf71dc9< 985a568171e7bdba6dcde3420d0e5bb515813457 |
affected |
afd66255b9a48f5851326ddae50e2203fbf71dc9< 6745fa65f4115045431c0c15610e876855a04625 |
affected | ||
afd66255b9a48f5851326ddae50e2203fbf71dc9< 526fac219e8b7d3369b43026bd0a1df51b811cd4 |
affected | ||
afd66255b9a48f5851326ddae50e2203fbf71dc9< 7a39c732a22ec4a369af9e19fbe3d666ec83eec4 |
affected | ||
2.6.34 |
affected | ||
< 2.6.34 |
unaffected | ||
6.12.113≤ 6.12.* |
unaffected | ||
6.18.56≤ 6.18.* |
unaffected | ||
| … +2 more rows | |||
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I. Basic Information for CVE-2026-98856
Vulnerability Information
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Vulnerability Title
kprobes: Skip disarmed probes when checking optkprobe overlap
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
kprobes: Skip disarmed probes when checking optkprobe overlap
On x86, an optkprobe at A replaces five bytes with a jump. If a disabled
probe B is at A+2, get_optimized_kprobe() stops at B when arming a new
probe C at A+4. It leaves A optimized:
A A+1 A+2 A+3 A+4
A's jump | e9 | d0 | d1 | d2 | d3 |
after C | e9 | d0 | d1 | d2 | cc |
The INT3 for C overwrites the last byte of A's jump displacement, so
execution can jump to the wrong address. B can have prepared optinsns
while disarmed, but has no jump to unoptimize.
Continue past disarmed and unprepared probes to find the active optimized
probe before arming a probe in its jump.
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-2026-98856
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-98856 (3)
Same Patch Batch · Linux · 2026-10-18 · 435 CVEs total
| CVE-2026-98719 | KVM: SEV: Nullify "have run CPUs" mask pointer when freeing it | |
| CVE-2026-98732 | Bluetooth: btintel: fix buffer over-read in btintel_hw_error() | |
| CVE-2026-98731 | Bluetooth: btintel_pcie: fix plen overflow in btintel_pcie_recv_frame() | |
| CVE-2026-98730 | Bluetooth: btintel_pcie: reject oversized TX packets in send_frame() | |
| CVE-2026-98729 | x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h | |
| CVE-2026-98728 | tpm: fix off-by-four bounds check in tpm2_get_random() | |
| CVE-2026-98727 | nvme-multipath: set BLK_FEAT_ZONED only after the zone info is known | |
| CVE-2026-98726 | nvme-multipath: fix underflow in ANA log bounds checks | |
| CVE-2026-98725 | nvmet-auth: fix out-of-bounds write in nvmet_auth_challenge() | |
| CVE-2026-98724 | nvmet: pci-epf: reject too-short SGL segments | |
| CVE-2026-98723 | nvmet: copy the hostid into the ctrl before creating PR pc_refs | |
| CVE-2026-98722 | mtd: block2mtd: Fix divide error when erase_size is zero | |
| CVE-2026-98721 | mtd: rawnand: cadence: Initialize IRQ state before requesting IRQ | |
| CVE-2026-98720 | KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified | |
| CVE-2026-98707 | wifi: mac80211: shut down RX BA session timer on teardown | |
| CVE-2026-98711 | wifi: cw1200: fix TX padding OOB read leaking heap data to device | |
| CVE-2026-98710 | wifi: iwlegacy: 3945: free EEPROM data on remove | |
| CVE-2026-98709 | wifi: mac80211: count only matching reservations in reserved switch | |
| CVE-2026-98712 | KVM: arm64: vgic: Take a refcount on IRQs referenced by last_lr_irq | |
| CVE-2026-98708 | wifi: mac80211: keep paired old chanctx alive |
Showing top 20 of 435 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
CVE-2026-98867
dm-pcache: bound the logical key offset from persistent memo -
CVE-2026-98866
sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
Same vendor: Linux
-
CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
CVE-2026-98867
dm-pcache: bound the logical key offset from persistent memo -
CVE-2026-98866
sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
V. Comments for CVE-2026-98856
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