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CVE-2024-40959 is a NULL-pointer dereference in the Linux kernel's IPv6 XFRM implementation. The xfrm6_get_saddr() function does not safely handle a NULL return from ip6_dst_idev() during source-address selection. Dereferencing the missing IPv6 device information can cause a kernel fault. A reported failure occurred during IPv6 XFRM route resolution invoked by WireGuard handshake transmission. The fix checks the return value of ip6_dst_idev() and handles the NULL case.
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A NULL-pointer dereference in the Linux kernel's IPv6 XFRM implementation occurs when xfrm6_get_saddr() fails to handle a NULL return from ip6_dst_idev(). It can cause a kernel fault and loss of availability. The advisory assigns a CVSS v3 base score of 5.5, with local access and low privileges required. Affected Google Container-Optimized OS kernel packages should be updated to version 18555.0.0 or later.
Linux kernel xfrm6 flaw caused by failure to check the ip6_dst_idev() return value in xfrm6_get_saddr().
Linux kernel IPv6 XFRM issue caused by failure to check the ip6_dst_idev() return value in xfrm6_get_saddr().
A Linux kernel xfrm6 flaw resulting from failure to validate the ip6_dst_idev() return value in xfrm6_get_saddr().
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Cross-references every affected SKU, including bundled OEM variants.
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