| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-47291: ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions |
| |
| While running the self-tests on a KASAN enabled kernel, I observed a |
| slab-out-of-bounds splat very similar to the one reported in |
| commit 821bbf79fe46 ("ipv6: Fix KASAN: slab-out-of-bounds Read in |
| fib6_nh_flush_exceptions"). |
| |
| We additionally need to take care of fib6_metrics initialization |
| failure when the caller provides an nh. |
| |
| The fix is similar, explicitly free the route instead of calling |
| fib6_info_release on a half-initialized object. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47291 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.3 with commit f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 and fixed in 5.4.136 with commit 830251361425c5be044db4d826aaf304ea3d14c6 |
| Issue introduced in 5.3 with commit f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 and fixed in 5.10.54 with commit ce8fafb68051fba52546f8bbe8621f7641683680 |
| Issue introduced in 5.3 with commit f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 and fixed in 5.13.6 with commit 115784bcccf135c3a3548098153413d76f16aae0 |
| Issue introduced in 5.3 with commit f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 and fixed in 5.14 with commit 8fb4792f091e608a0a1d353dfdf07ef55a719db5 |
| |
| 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-2021-47291 |
| 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/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/830251361425c5be044db4d826aaf304ea3d14c6 |
| https://git.kernel.org/stable/c/ce8fafb68051fba52546f8bbe8621f7641683680 |
| https://git.kernel.org/stable/c/115784bcccf135c3a3548098153413d76f16aae0 |
| https://git.kernel.org/stable/c/8fb4792f091e608a0a1d353dfdf07ef55a719db5 |
