wifi: mac80211: handle empty FILS association request payload

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98698
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:23 UTC
Updated2026-10-21 13:21:37 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: handle empty FILS association request payload fils_encrypt_assoc_req() accepts a (Re)Association Request frame whose last element is the FILS Session element. crypt_len is then zero and aes_siv_encrypt() is called with an empty plaintext. kmemdup() returns ZERO_SIZE_PTR for a zero-length allocation, so the unconditional sg_init_one() puts an invalid page into the scatterlist. With CONFIG_DEBUG_SG this triggers a kernel BUG in sg_set_buf(); without the debug check the bogus page is handed to the crypto backend. AES-SIV is defined for empty plaintext and the S2V result is then the complete output, so handle this case before the CTR step, which has nothing to encrypt.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.057140000 (date 2026-10-21)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 39404feee691a2dc524a629ed6eb5cfe5d8898d1 0b1e4a7eeb6a301ee33bd318982927cbdbae9f36 git Not specified
CNA Linux Linux affected 39404feee691a2dc524a629ed6eb5cfe5d8898d1 2f5b62f6534d336a62fdb9e88b186dd70b4323ef git Not specified
CNA Linux Linux affected 39404feee691a2dc524a629ed6eb5cfe5d8898d1 452f1c9b76f7a122bbc4630b9691bda4809677c4 git Not specified
CNA Linux Linux affected 39404feee691a2dc524a629ed6eb5cfe5d8898d1 20f939b0c151d1d28e6b62a76b2454fa6fe877f2 git Not specified
CNA Linux Linux affected 39404feee691a2dc524a629ed6eb5cfe5d8898d1 5bfd4b0b40b79781d900cb2f7da0685070f53c67 git Not specified
CNA Linux Linux affected 4.10 Not specified
CNA Linux Linux unaffected 4.10 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/452f1c9b76f7a122bbc4630b9691bda4809677c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0b1e4a7eeb6a301ee33bd318982927cbdbae9f36 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5bfd4b0b40b79781d900cb2f7da0685070f53c67 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/20f939b0c151d1d28e6b62a76b2454fa6fe877f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2f5b62f6534d336a62fdb9e88b186dd70b4323ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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