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CVE-2026-98590— bpf: Fix bpf_sock context code generation

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： bpf：修复 bpf_sock 上下文的代码生成问题 当前，上下文访问代码会以 4 字节或 2 字节的方式读取 字段，验证器（verifier）会将寄存器中的其余位标记为已知零。然而，生成的上下文访问代码在某些情况下会通过 指令将特殊值（-1）写入寄存器；该值在符号扩展后会导致寄存器中所有位均被置为 1。程序随后对该值执行右移操作，导致运行时得到的值超出了验证器认为可能的范围。 修复方法是确保读取的值的宽度与假设的宽度一致。改用 指令替代 指令，以保持高位为零（与验证器

AI Predicted 5.5 Difficulty: Hard EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1069 · Permission Groups Discovery

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c3c16f2ea6d20159903cf93afbb1155f3d8348d5< e3ddcf4aeb342d4de2e5761c7042270d454752de affected
c3c16f2ea6d20159903cf93afbb1155f3d8348d5< 4a41d064facc3330e176ecbbf5b0026ed18a5c69 affected
c3c16f2ea6d20159903cf93afbb1155f3d8348d5< 70288599d1754e157df8326239316dbdf08ea33c affected
c3c16f2ea6d20159903cf93afbb1155f3d8348d5< ea4dc96c902ccfa49dd3e4f23c443dab4a74b018 affected
c3c16f2ea6d20159903cf93afbb1155f3d8348d5< b3f37afc7fd7c52bc2114310aff1eb24c7cd4d73 affected
c3c16f2ea6d20159903cf93afbb1155f3d8348d5< d95dd5a6c6cd08d5ae466d3aed27b3cf59155a6c affected
c3c16f2ea6d20159903cf93afbb1155f3d8348d5< 84ebb991ae985149079ae9ab51b7e3ba25a9ff53 affected
c3c16f2ea6d20159903cf93afbb1155f3d8348d5< 4a4852376e3a2727ea40e61143d6d7c22bb6dfad affected
… +10 more rows
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I. Basic Information for CVE-2026-98590

Vulnerability Information
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Vulnerability Title
bpf: Fix bpf_sock context code generation
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix bpf_sock context code generation Currently, the ctx access code reads the rx_queue_mapping field with either a 4-byte or 2-byte load. The rest of the bits in the register are marked known zero by the verifier. However, the emitted ctx access code places in the register on certain the special value (-1) using BPF_MOV_IMM64, which gets sign-extended to turn on all the bits in the register. By shifting this value right, the program ends up with a value at runtime above what the verifier assumes is possible. Fix this by ensuring the read value is as wide as the assumed size. Use MOV32 instructions instead of MOV64 instructions to keep the upper bits zero as assumed by the verifier. Also properly report the size of the destination variable (the bpf_sock field, 4 bytes) instead of the source (the socket field, 2 bytes).
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 c3c16f2ea6d20159903cf93afbb1155f3d8348d5 ~ e3ddcf4aeb342d4de2e5761c7042270d454752de -
Linux Linux 5.8 -

II. Public POCs for CVE-2026-98590

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III. Intelligence Information for CVE-2026-98590

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Patches & Fixes for CVE-2026-98590 (7)

Same Patch Batch · Linux · 2026-10-18 · 435 CVEs total

CVE-2026-98720 KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified
CVE-2026-98733 Bluetooth: hci_core: Serialize fragmented ISO packet queueing
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-2026-98709 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-2026-98711 wifi: cw1200: fix TX padding OOB read leaking heap data to device
CVE-2026-98710 wifi: iwlegacy: 3945: free EEPROM data on remove
CVE-2026-98713 KVM: arm64: Apply the fine-grained UNDEFs without FEAT_FGT
CVE-2026-98707 wifi: mac80211: shut down RX BA session timer on teardown

Showing top 20 of 435 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98590

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