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CVE-2026-90157— bpf: Reject negative optlen in cgroup getsockopt hook

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： BPF：在 cgroup getsockopt 钩子中拒绝负的 optlen cgroup getsockopt BPF 程序可以在内核的 getsockopt 处理程序执行后缩小 的值。用于 的内核缓冲区变体，仅拒绝大于原始长度的值。 如果 BPF 写入了负的 ，该值会被接受并传回 TCP 的 getsockopt 代码。随后，它会被以 类型传递给 ，从而触发强化版 usercopy 的 “bytes > INT_MAX” 警告。 在 中拒绝负的 ，以匹配基于 sockp

AI Predicted 5.5 Difficulty: Moderate EPSS 0.22% · P11

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 19

VendorProduct Version RangeStatus
Linux Linux 08f61a34913558e06576e7b6318bf583f273c1be< 5b09d984b38b018b123c3a9e02a96bbc6468dbe5 affected
9cacf81f8161111db25f98e78a7a0e32ae142b3f< 554ba7195c4108726450e24480c8449990c2268c affected
9cacf81f8161111db25f98e78a7a0e32ae142b3f< d02a12b4085ffe41ea750b1007f7a9c7aee2875a affected
9cacf81f8161111db25f98e78a7a0e32ae142b3f< e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2 affected
9cacf81f8161111db25f98e78a7a0e32ae142b3f< f68671b1a98d426c57864bd457c125fee14ac1a5 affected
9cacf81f8161111db25f98e78a7a0e32ae142b3f< 2bdbe00454200fcb0110f31eeca8d906a3515e74 affected
9cacf81f8161111db25f98e78a7a0e32ae142b3f< 31a89af4f513d750fec196e2bb6195a7d4473e9f affected
9cacf81f8161111db25f98e78a7a0e32ae142b3f< 1b5aacd5b2419b0790e955e466d389a61c79b4b1 affected
… +11 more rows
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I. Basic Information for CVE-2026-90157

Vulnerability Information
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Vulnerability Title
bpf: Reject negative optlen in cgroup getsockopt hook
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject negative optlen in cgroup getsockopt hook A cgroup getsockopt BPF program can shrink ctx->optlen after the kernel getsockopt handler has run. The kernel-buffer variant, used by TCP_ZEROCOPY_RECEIVE, only rejects values larger than the original length. If BPF writes a negative optlen, that value is accepted and propagated back to the TCP getsockopt code. It can then be passed to copy_to_sockptr() as a size_t and trigger the hardened usercopy bytes > INT_MAX warning. Reject negative ctx.optlen in __cgroup_bpf_run_filter_getsockopt_kern(), matching the lower-bound validation already present in the sockptr-based getsockopt hook.
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 08f61a34913558e06576e7b6318bf583f273c1be ~ 5b09d984b38b018b123c3a9e02a96bbc6468dbe5 -
Linux Linux 5.12 -

II. Public POCs for CVE-2026-90157

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III. Intelligence Information for CVE-2026-90157

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Patches & Fixes for CVE-2026-90157 (8)

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

Same product: Linux
Same vendor: Linux

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