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.
History

Thu, 19 Sep 2024 10:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

Wed, 11 Sep 2024 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 11 Sep 2024 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-05-17T14:27:31.822Z

Updated: 2024-12-19T08:56:21.471Z

Reserved: 2024-05-17T13:50:33.104Z

Link: CVE-2024-35841

cve-icon Vulnrichment

Updated: 2024-08-02T03:21:48.073Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2024-05-17T15:15:21.160

Modified: 2024-11-21T09:21:01.320

Link: CVE-2024-35841

cve-icon Redhat

Severity : Moderate

Publid Date: 2024-05-17T00:00:00Z

Links: CVE-2024-35841 - Bugzilla