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CVE-2026-98698

UnknownEPSS 0.17%

Last modified

CVE-2026-98698 is a vulnerability of currently unknown severity. In 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.. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

Description

In 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.

Metrics

EPSS Probability
0.17%

6.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 39404feee691a2dc524a629ed6eb5cfe5d8898d1, < de3297c8e521c0b0ddc89ece6fee84e25da9ecf0; >= 39404feee691a2dc524a629ed6eb5cfe5d8898d1, < ce70c87252a14020cb40032efe208efc6e61b1ee; >= 39404feee691a2dc524a629ed6eb5cfe5d8898d1, < d8c5dbbf584a1baaa008988ac64dd4495f7086bd; >= 39404feee691a2dc524a629ed6eb5cfe5d8898d1, < 0b1e4a7eeb6a301ee33bd318982927cbdbae9f36; >= 39404feee691a2dc524a629ed6eb5cfe5d8898d1, < 2f5b62f6534d336a62fdb9e88b186dd70b4323ef; >= 39404feee691a2dc524a629ed6eb5cfe5d8898d1, < 452f1c9b76f7a122bbc4630b9691bda4809677c4; >= 39404feee691a2dc524a629ed6eb5cfe5d8898d1, < 20f939b0c151d1d28e6b62a76b2454fa6fe877f2; >= 39404feee691a2dc524a629ed6eb5cfe5d8898d1, < 5bfd4b0b40b79781d900cb2f7da0685070f53c67
LinuxLinux4.10

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98698?
In 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.
How severe is CVE-2026-98698?
Severity scoring for CVE-2026-98698 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98698?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST