A network-adjacent attacker can send packets addressed to a host's VPN tunnel address over the physical interface. Because Linux uses the weak host model by default, the host replies, which lets the attacker infer the tunnel address, confirm active connections and eventually inject into the tunneled TCP stream.
No upstream kernel fix exists. The disclosure notes that reverse path filtering is not a complete solution because the attack also works over IPv6, which has no rp_filter; the mitigation that shipped was a firewall rule added to wg-quick(8) in userspace: https://www.openwall.com/lists/oss-security/2019/12/05/1 https://lore.kernel.org/all/[email protected]/ Distribution trackers record the same state: Ubuntu has it deferred since 2019-12-13, Debian does not track it against the kernel, and Red Hat scopes it to openvpn: https://ubuntu.com/security/CVE-2019-14899 https://security-tracker.debian.org/tracker/CVE-2019-14899 Record it unpatched so it stays visible rather than excluded. CC: Paul Barker <[email protected]> AI-Generated: Uses Claude (claude-opus-5) Signed-off-by: Junjie Cao <[email protected]> --- v3: - use "unpatched" instead of "upstream-wontfix": there is no upstream statement, only distribution and disclosure sources v2: https://lore.kernel.org/openembedded-core/[email protected]/ meta/recipes-kernel/linux/cve-exclusion.inc | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/meta/recipes-kernel/linux/cve-exclusion.inc b/meta/recipes-kernel/linux/cve-exclusion.inc index d27d764..5ed4a00 100644 --- a/meta/recipes-kernel/linux/cve-exclusion.inc +++ b/meta/recipes-kernel/linux/cve-exclusion.inc @@ -192,3 +192,10 @@ CVE_STATUS[CVE-2025-68195] = "fixed-version: Fixed from 6.18" # Fix https://git.kernel.org/stable/c/b4b64fda4d30a83a7f00e92a0c8a1d47699609f3 # Backport https://git.kernel.org/stable/c/75c5d9bce072abbbc09b701a49869ac23c34a906 CVE_STATUS[CVE-2025-71145] = "cpe-stable-backport: Fixed from v6.18.3" + +# Consequence of the default weak host model, not a specific defect; +# mitigation is firewall configuration only (rp_filter for IPv4, a +# strong host model rule such as wg-quick(8)'s, which also covers IPv6). +# https://ubuntu.com/security/CVE-2019-14899 +CVE_STATUS[CVE-2019-14899] = "unpatched: consequence of the default weak \ +host model, no upstream kernel fix, mitigated by firewall configuration" -- 2.43.0
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