CVE-2024-35841 (GCVE-0-2024-35841)

Vulnerability from cvelistv5 – Published: 2024-05-17 14:27 – Updated: 2025-05-04 09:06
VLAI?
Title
net: tls, fix WARNIING in __sk_msg_free
Summary
In the Linux kernel, the following vulnerability has been resolved: net: tls, fix WARNIING in __sk_msg_free A splice with MSG_SPLICE_PAGES will cause tls code to use the tls_sw_sendmsg_splice path in the TLS sendmsg code to move the user provided pages from the msg into the msg_pl. This will loop over the msg until msg_pl is full, checked by sk_msg_full(msg_pl). The user can also set the MORE flag to hint stack to delay sending until receiving more pages and ideally a full buffer. If the user adds more pages to the msg than can fit in the msg_pl scatterlist (MAX_MSG_FRAGS) we should ignore the MORE flag and send the buffer anyways. What actually happens though is we abort the msg to msg_pl scatterlist setup and then because we forget to set 'full record' indicating we can no longer consume data without a send we fallthrough to the 'continue' path which will check if msg_data_left(msg) has more bytes to send and then attempts to fit them in the already full msg_pl. Then next iteration of sender doing send will encounter a full msg_pl and throw the warning in the syzbot report. To fix simply check if we have a full_record in splice code path and if not send the msg regardless of MORE flag.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fe1e81d4f73b6cbaed4fcc476960d26770642842 , < 02e368eb1444a4af649b73cbe2edd51780511d86 (git)
Affected: fe1e81d4f73b6cbaed4fcc476960d26770642842 , < 294e7ea85f34748f04e5f3f9dba6f6b911d31aa8 (git)
Affected: fe1e81d4f73b6cbaed4fcc476960d26770642842 , < dc9dfc8dc629e42f2234e3327b75324ffc752bc9 (git)
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    Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.14 , ≤ 6.6.* (semver)
Unaffected: 6.7.2 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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