mptcp: fix data re-injection from stale subflow (Linux Linux)

CVE-2024-26826
HIGH 7.5

En bref

Source
NVD
EPSS
EPSS 0.65 % · centile 51 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix data re-injection from stale subflow When the MPTCP PM detects that a subflow is stale, all the packet scheduler must re-inject all the mptcp-level unacked data. To avoid acquiring unneeded locks, it first try to check if any unacked data is present at all in the RTX queue, but such check is currently broken, as it uses TCP-specific helper on an MPTCP socket. Funnily enough fuzzers and static checkers are happy, as the accessed memory still belongs to the mptcp_sock struct, and even from a functional perspective the recovery completed successfully, as the short-cut test always failed. A recent unrelated TCP change - commit d5fed5addb2b ("tcp: reorganize tcp_sock fast path variables") - exposed the issue, as the tcp field reorganization makes the mptcp code always skip the re-inection. Fix the issue dropping the bogus call: we are on a slow path, the early optimization proved once again to be evil.

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLinux
CVSS 3.1HIGH 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
CVSS 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 1e1d9d6f119c55c05e8ea78ed3e49046690abffd < 6f95120f898b40d13fd441225ef511307853c9c2 ; affected 1e1d9d6f119c55c05e8ea78ed3e49046690abffd < 6673d9f1c2cd984390550dbdf7d5ae07b20abbf8 ; affected 1e1d9d6f119c55c05e8ea78ed3e49046690abffd < b609c783c535493aa3fca22c7e40a120370b1ca5 ; affected 1e1d9d6f119c55c05e8ea78ed3e49046690abffd < 624902eab7abcb8731b333ec73f206d38d839cd8 ; affected 1e1d9d6f119c55c05e8ea78ed3e49046690abffd < b6c620dc43ccb4e802894e54b651cf81495e9598
Linux · Linuxaffected 5.15 ; unaffected 0 < 5.15 ; unaffected 5.15.149 ≤ 5.15.* ; unaffected 6.1.79 ≤ 6.1.* ; unaffected 6.6.18 ≤ 6.6.* ; unaffected 6.7.6 ≤ 6.7.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD