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CVE-2026-31552— wifi: wlcore: Return -ENOMEM instead of -EAGAIN if there is not enough headroom

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.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于wl1271_tx_allocate函数在pskb_expand_head失败时返回-EAGAIN，被错误解释为聚合缓冲区已满，导致无限循环和CPU软锁定。

CVSS 7.5 · High EPSS 0.72% · P53

Affected Version Matrix 24

VendorProduct Version RangeStatus
Linux Linux 88295a55fefe5414e64293638b6f7549646e58ed< 980f793645540ca7a6318165cc12f49d5febeb99 affected
cd89a4656c03f8db0c57350aaec69cd3cfaa3522< 12f9eef39e49716c763714bfda835a733d5f6dea affected
745a0810dbc96a0471e5f5e627ba1e978c3116d4< ceb46b40b021d21911ff8608ce4ed33c1264ad2f affected
b167312390fdd461c81ead516f2b0b44e83a9edb< a6dc74209462c4fe5a88718d2f3a5286886081c8 affected
71de0b6e04bbee5575caf9a1e4d424e7dcc50018< cfa64e2b3717be1da7c4c1aff7268a009e8c1610 affected
689a7980e4788e13e766763d53569fb78dea2513< 46c670ff1ff466e5eccb3940f726586473dc053c affected
e75665dd096819b1184087ba5718bd93beafff51< f2c06d718a7b85cbc59ceaa2ff3f46b178ac709c affected
e75665dd096819b1184087ba5718bd93beafff51< deb353d9bb009638b7762cae2d0b6e8fdbb41a69 affected
… +16 more rows
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I. Basic Information for CVE-2026-31552

Vulnerability Information
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Vulnerability Title
wifi: wlcore: Return -ENOMEM instead of -EAGAIN if there is not enough headroom
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: wifi: wlcore: Return -ENOMEM instead of -EAGAIN if there is not enough headroom Since upstream commit e75665dd0968 ("wifi: wlcore: ensure skb headroom before skb_push"), wl1271_tx_allocate() and with it wl1271_prepare_tx_frame() returns -EAGAIN if pskb_expand_head() fails. However, in wlcore_tx_work_locked(), a return value of -EAGAIN from wl1271_prepare_tx_frame() is interpreted as the aggregation buffer being full. This causes the code to flush the buffer, put the skb back at the head of the queue, and immediately retry the same skb in a tight while loop. Because wlcore_tx_work_locked() holds wl->mutex, and the retry happens immediately with GFP_ATOMIC, this will result in an infinite loop and a CPU soft lockup. Return -ENOMEM instead so the packet is dropped and the loop terminates. The problem was found by an experimental code review agent based on gemini-3.1-pro while reviewing backports into v6.18.y.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于wl1271_tx_allocate函数在pskb_expand_head失败时返回-EAGAIN，被错误解释为聚合缓冲区已满，导致无限循环和CPU软锁定。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 88295a55fefe5414e64293638b6f7549646e58ed ~ 980f793645540ca7a6318165cc12f49d5febeb99 -
Linux Linux 6.19 -

II. Public POCs for CVE-2026-31552

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III. Intelligence Information for CVE-2026-31552

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Same Patch Batch · Linux · 2026-04-24 · 138 CVEs total

CVE-2026-31649 9.8 CRITICAL net: stmmac: fix integer underflow in chain mode
CVE-2026-31607 9.8 CRITICAL usbip: validate number_of_packets in usbip_pack_ret_submit()
CVE-2026-31536 9.8 CRITICAL smb: server: let send_done handle a completion without IB_SEND_SIGNALED
CVE-2026-31633 9.8 CRITICAL rxrpc: Fix integer overflow in rxgk_verify_response()
CVE-2026-31608 9.8 CRITICAL smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list
CVE-2026-31669 9.8 CRITICAL mptcp: fix slab-use-after-free in __inet_lookup_established
CVE-2026-31668 9.8 CRITICAL seg6: separate dst_cache for input and output paths in seg6 lwtunnel
CVE-2026-31589 9.8 CRITICAL mm: call ->free_folio() directly in folio_unmap_invalidate()
CVE-2026-31609 9.8 CRITICAL smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
CVE-2026-31657 9.8 CRITICAL batman-adv: hold claim backbone gateways by reference
CVE-2026-31659 9.8 CRITICAL batman-adv: reject oversized global TT response buffers
CVE-2026-31637 9.8 CRITICAL rxrpc: reject undecryptable rxkad response tickets
CVE-2026-31636 9.1 CRITICAL rxrpc: fix RESPONSE authenticator parser OOB read
CVE-2026-31570 8.8 HIGH can: gw: fix OOB heap access in cgw_csum_crc8_rel()
CVE-2026-31558 8.8 HIGH LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust
CVE-2026-31553 8.8 HIGH KVM: arm64: Fix the descriptor address in __kvm_at_swap_desc()
CVE-2026-31622 8.8 HIGH NFC: digital: Bounds check NFC-A cascade depth in SDD response handler
CVE-2026-31588 8.8 HIGH KVM: x86: Use scratch field in MMIO fragment to hold small write values
CVE-2026-31629 8.8 HIGH nfc: llcp: add missing return after LLCP_CLOSED checks
CVE-2026-31611 8.6 HIGH ksmbd: require 3 sub-authorities before reading sub_auth[2]

Showing top 20 of 138 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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