{"cve":"CVE-2024-26826","nvd":{"published":"2024-04-17T10:15:09.183","modified":"2026-08-04T11:17:11.097","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix data re-injection from stale subflow\n\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.\n\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.\n\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.\n\nFix the issue dropping the bogus call: we are on a slow path, the early\noptimization proved once again to be evil.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/624902eab7abcb8731b333ec73f206d38d839cd8","https://git.kernel.org/stable/c/6673d9f1c2cd984390550dbdf7d5ae07b20abbf8","https://git.kernel.org/stable/c/6f95120f898b40d13fd441225ef511307853c9c2","https://git.kernel.org/stable/c/b609c783c535493aa3fca22c7e40a120370b1ca5","https://git.kernel.org/stable/c/b6c620dc43ccb4e802894e54b651cf81495e9598"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:48:32.179249784+00:00"},"epss":{"cve":"CVE-2024-26826","score":0.00651,"percentile":0.51213,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}