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Message-ID: <2024091104-CVE-2024-45009-24ea@gregkh> Date: Wed, 11 Sep 2024 17:14:05 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-45009: mptcp: pm: only decrement add_addr_accepted for MPJ req Description =========== In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: only decrement add_addr_accepted for MPJ req Adding the following warning ... WARN_ON_ONCE(msk->pm.add_addr_accepted == 0) ... before decrementing the add_addr_accepted counter helped to find a bug when running the "remove single subflow" subtest from the mptcp_join.sh selftest. Removing a 'subflow' endpoint will first trigger a RM_ADDR, then the subflow closure. Before this patch, and upon the reception of the RM_ADDR, the other peer will then try to decrement this add_addr_accepted. That's not correct because the attached subflows have not been created upon the reception of an ADD_ADDR. A way to solve that is to decrement the counter only if the attached subflow was an MP_JOIN to a remote id that was not 0, and initiated by the host receiving the RM_ADDR. The Linux kernel CVE team has assigned CVE-2024-45009 to this issue. Affected and fixed versions =========================== Issue introduced in 5.10 with commit d0876b2284cf and fixed in 6.1.107 with commit 85b866e4c4e6 Issue introduced in 5.10 with commit d0876b2284cf and fixed in 6.6.48 with commit d20bf2c96d7f Issue introduced in 5.10 with commit d0876b2284cf and fixed in 6.10.7 with commit 2060f1efab37 Issue introduced in 5.10 with commit d0876b2284cf and fixed in 6.11-rc5 with commit 1c1f72137598 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-45009 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/mptcp/pm_netlink.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/85b866e4c4e63a1d7afb58f1e24273caad03d0b7 https://git.kernel.org/stable/c/d20bf2c96d7ffd171299b32f562f70e5bf5dc608 https://git.kernel.org/stable/c/2060f1efab370b496c4903b840844ecaff324c3c https://git.kernel.org/stable/c/1c1f721375989579e46741f59523e39ec9b2a9bd
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