Bugzilla – Bug 1221968
VUL-0: CVE-2021-47152: kernel: mptcp: fix data stream corruption
Last modified: 2024-05-31 13:04:50 UTC
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix data stream corruption Maxim reported several issues when forcing a TCP transparent proxy to use the MPTCP protocol for the inbound connections. He also provided a clean reproducer. The problem boils down to 'mptcp_frag_can_collapse_to()' assuming that only MPTCP will use the given page_frag. If others - e.g. the plain TCP protocol - allocate page fragments, we can end-up re-using already allocated memory for mptcp_data_frag. Fix the issue ensuring that the to-be-expanded data fragment is located at the current page frag end. v1 -> v2: - added missing fixes tag (Mat) References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47152 https://www.cve.org/CVERecord?id=CVE-2021-47152 https://git.kernel.org/stable/c/18e7f0580da15cac1e79d73683ada5a9e70980f8 https://git.kernel.org/stable/c/29249eac5225429b898f278230a6ca2baa1ae154 https://git.kernel.org/stable/c/3267a061096efc91eda52c2a0c61ba76e46e4b34 https://bugzilla.redhat.com/show_bug.cgi?id=2271475
Offending commit (18b683bff89d) found in: - ALP-current - cve/linux-5.14-LTSS - SLE15-SP4-LTSS - SLE15-SP5 - SLE15-SP6 - stable Fixing commit (29249eac5225) found in: - ALP-current - cve/linux-5.14-LTSS - SLE15-SP4-LTSS - SLE15-SP5 - SLE15-SP6 - stable All branches fixed. @kernel-team, please add the CVE reference.
All references are now added, sending back to the security team.
All done, closing.