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Message-ID: <2024090445-CVE-2024-44986-1197@gregkh> Date: Wed, 4 Sep 2024 21:56:51 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-44986: ipv6: fix possible UAF in ip6_finish_output2() Description =========== In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible UAF in ip6_finish_output2() If skb_expand_head() returns NULL, skb has been freed and associated dst/idev could also have been freed. We need to hold rcu_read_lock() to make sure the dst and associated idev are alive. The Linux kernel CVE team has assigned CVE-2024-44986 to this issue. Affected and fixed versions =========================== Issue introduced in 5.14 with commit 5796015fa968 and fixed in 5.15.166 with commit e891b36de161 Issue introduced in 5.14 with commit 5796015fa968 and fixed in 6.1.107 with commit 3574d28caf9a Issue introduced in 5.14 with commit 5796015fa968 and fixed in 6.6.48 with commit 6ab6bf731354 Issue introduced in 5.14 with commit 5796015fa968 and fixed in 6.10.7 with commit 56efc2531967 Issue introduced in 5.14 with commit 5796015fa968 and fixed in 6.11-rc5 with commit da273b377ae0 Issue introduced in 5.4.137 with commit ded37d03440d Issue introduced in 5.10.55 with commit 2323690eb058 Issue introduced in 5.13.7 with commit b34c668a867f 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-2024-44986 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/ipv6/ip6_output.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/e891b36de161fcd96f12ff83667473e5067b9037 https://git.kernel.org/stable/c/3574d28caf9a09756ae87ad1ea096c6f47b6101e https://git.kernel.org/stable/c/6ab6bf731354a6fdbaa617d1ec194960db61cf3b https://git.kernel.org/stable/c/56efc253196751ece1fc535a5b582be127b0578a https://git.kernel.org/stable/c/da273b377ae0d9bd255281ed3c2adb228321687b
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