wifi: wlcore: Return -ENOMEM instead of -EAGAIN if there is not enough headroom

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Summary

CVECVE-2026-31552
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:29 UTC
Updated2026-04-27 20:15:16 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000240000 probability, percentile 0.067850000 (date 2026-04-27)

Problem Types: CWE-835

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 88295a55fefe5414e64293638b6f7549646e58ed 980f793645540ca7a6318165cc12f49d5febeb99 git Not specified
CNA Linux Linux affected cd89a4656c03f8db0c57350aaec69cd3cfaa3522 12f9eef39e49716c763714bfda835a733d5f6dea git Not specified
CNA Linux Linux affected 745a0810dbc96a0471e5f5e627ba1e978c3116d4 ceb46b40b021d21911ff8608ce4ed33c1264ad2f git Not specified
CNA Linux Linux affected b167312390fdd461c81ead516f2b0b44e83a9edb a6dc74209462c4fe5a88718d2f3a5286886081c8 git Not specified
CNA Linux Linux affected 71de0b6e04bbee5575caf9a1e4d424e7dcc50018 cfa64e2b3717be1da7c4c1aff7268a009e8c1610 git Not specified
CNA Linux Linux affected 689a7980e4788e13e766763d53569fb78dea2513 46c670ff1ff466e5eccb3940f726586473dc053c git Not specified
CNA Linux Linux affected e75665dd096819b1184087ba5718bd93beafff51 f2c06d718a7b85cbc59ceaa2ff3f46b178ac709c git Not specified
CNA Linux Linux affected e75665dd096819b1184087ba5718bd93beafff51 deb353d9bb009638b7762cae2d0b6e8fdbb41a69 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.20 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.10 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a6dc74209462c4fe5a88718d2f3a5286886081c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/deb353d9bb009638b7762cae2d0b6e8fdbb41a69 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ceb46b40b021d21911ff8608ce4ed33c1264ad2f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/12f9eef39e49716c763714bfda835a733d5f6dea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f2c06d718a7b85cbc59ceaa2ff3f46b178ac709c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/46c670ff1ff466e5eccb3940f726586473dc053c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/980f793645540ca7a6318165cc12f49d5febeb99 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cfa64e2b3717be1da7c4c1aff7268a009e8c1610 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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