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CVE-2026-90195— riscv, bpf: Fix missing sign-ext for signed 1-byte and 2-byte kfunc args

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： RISC-V、BPF：修复有符号 1 字节和 2 字节 kfunc 参数缺失的符号扩展 在 RV64 架构中，ABI 要求对有符号的 1 字节和 2 字节 kfunc 参数进行符号扩展。然而，当前的 RV64 JIT 编译器并未对这些 kfunc 参数执行符号扩展。 在提交 7ce090afbf72（“bpf: 基于静态寄存器活性分析推导 zext_dst”）之前，状态剪枝可能会省略对 32 位子寄存器的零扩展，这无意中掩盖了上述问题，使得这些参数看起来像是已经正确进行

AI Predicted 4.3 Difficulty: Theoretical EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1205.003

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 443574b033876c85a35de4c65c14f7fe092222b2< 555fc6f1caf00ce7005e732b688da26c0dc3c5c5 affected
443574b033876c85a35de4c65c14f7fe092222b2< 801ae90f8ce099187e6224cec7d72d07a4df0324 affected
443574b033876c85a35de4c65c14f7fe092222b2< 71dbd143be598954ae103feadd12692aeb0f2f88 affected
443574b033876c85a35de4c65c14f7fe092222b2< f2aaa621591093cfe8224a25ef2f04a3b1e304b0 affected
6.9 affected
< 6.9 unaffected
6.12.110≤ 6.12.* unaffected
6.18.52≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-90195

Vulnerability Information
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Vulnerability Title
riscv, bpf: Fix missing sign-ext for signed 1-byte and 2-byte kfunc args
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: riscv, bpf: Fix missing sign-ext for signed 1-byte and 2-byte kfunc args On RV64, the ABI requires sign-extension for signed 1-byte and 2-byte kfunc args. However, the RV64 JIT currently does not perform sign-extension for such kfunc args. Before commit 7ce090afbf72 ("bpf: Infer zext_dst based on static register liveness analysis"), state pruning could potentially omit zero-extension of 32-bit subregisters, which inadvertently masked the above issue by making the args appear as if they had been properly sign-extended. After that commit, the problem is exposed, causing the kfunc_call/kfunc_call_test4 selftest to fail. Fix this by extending the existing sign-extension logic to handle signed 1-byte and 2-byte kfunc args as well.
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 443574b033876c85a35de4c65c14f7fe092222b2 ~ 555fc6f1caf00ce7005e732b688da26c0dc3c5c5 -
Linux Linux 6.9 -

II. Public POCs for CVE-2026-90195

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III. Intelligence Information for CVE-2026-90195

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Patches & Fixes for CVE-2026-90195 (2)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

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Same vendor: Linux

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