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Date: Sat, 2 Mar 2024 23:00:13 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2023-52579: ipv4: fix null-deref in ipv4_link_failure Description =========== In the Linux kernel, the following vulnerability has been resolved: ipv4: fix null-deref in ipv4_link_failure Currently, we assume the skb is associated with a device before calling __ip_options_compile, which is not always the case if it is re-routed by ipvs. When skb->dev is NULL, dev_net(skb->dev) will become null-dereference. This patch adds a check for the edge case and switch to use the net_device from the rtable when skb->dev is NULL. The Linux kernel CVE team has assigned CVE-2023-52579 to this issue. Affected and fixed versions =========================== Issue introduced in 4.14.114 with commit 0a7e8300b7f4 and fixed in 4.14.327 with commit 084c7ac9e8d6 Issue introduced in 4.19.37 with commit 7ba5ec69e1a7 and fixed in 4.19.296 with commit a2cf7bd75b39 Issue introduced in 5.1 with commit ed0de45a1008 and fixed in 5.4.258 with commit 810fd23d9715 Issue introduced in 5.1 with commit ed0de45a1008 and fixed in 5.10.198 with commit 8689c9ace976 Issue introduced in 5.1 with commit ed0de45a1008 and fixed in 5.15.134 with commit 8860d354f653 Issue introduced in 5.1 with commit ed0de45a1008 and fixed in 6.1.56 with commit 2712545e535d Issue introduced in 5.1 with commit ed0de45a1008 and fixed in 6.5.6 with commit cda20fcddf53 Issue introduced in 5.1 with commit ed0de45a1008 and fixed in 6.6 with commit 0113d9c9d1cc Please see https://www.kernel.org or 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-2023-52579 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/ipv4/route.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/084c7ac9e8d60bf21a423490021b7c3427312955 https://git.kernel.org/stable/c/a2cf7bd75b3992e8df68dd5fdc6499b67d45f6e0 https://git.kernel.org/stable/c/810fd23d9715474aa27997584e8fc9396ef3cb67 https://git.kernel.org/stable/c/8689c9ace976d6c078e6dc844b09598796e84099 https://git.kernel.org/stable/c/8860d354f653628b6330e1c5b06b2828948135a4 https://git.kernel.org/stable/c/2712545e535d7a2e4c53b9c9658a9c88c6055862 https://git.kernel.org/stable/c/cda20fcddf53f0f959641c8ef4d50ab87ffa5124 https://git.kernel.org/stable/c/0113d9c9d1ccc07f5a3710dac4aa24b6d711278c
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