CVE-2024-26826

CVE Details

Release Date:

2024-04-17

Description

In the Linux kernel, the following vulnerability has been resolved:\nmptcp: fix data re-injection from stale subflow\nWhen the MPTCP PM detects that a subflow is stale, all the packet\nscheduler must re-inject all the mptcp-level unacked data. To avoid\nacquiring unneeded locks, it first try to check if any unacked data\nis present at all in the RTX queue, but such check is currently\nbroken, as it uses TCP-specific helper on an MPTCP socket.\nFunnily enough fuzzers and static checkers are happy, as the accessed\nmemory still belongs to the mptcp_sock struct, and even from a\nfunctional perspective the recovery completed successfully, as\nthe short-cut test always failed.\nA recent unrelated TCP change - commit d5fed5addb2b ('tcp: reorganize\ntcp_sock fast path variables') - exposed the issue, as the tcp field\nreorganization makes the mptcp code always skip the re-inection.\nFix the issue dropping the bogus call: we are on a slow path, the early\noptimization proved once again to be evil.

See more information about CVE-2024-26826 from MITRE CVE dictionary and NIST NVD

CVSS Scoring

NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.

Base Score:	5.5	CVSS Vector:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector:	Local network	Attack Complexity:	Low
Privileges Required:	Low	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	None	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (kernel)	ELSA-2024-4211	2024-07-02
Oracle Linux version 9 (kernel)	ELSA-2024-8617	2024-10-30