| 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-2024-46800: sch/netem: fix use after free in netem_dequeue |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| sch/netem: fix use after free in netem_dequeue |
| |
| If netem_dequeue() enqueues packet to inner qdisc and that qdisc |
| returns __NET_XMIT_STOLEN. The packet is dropped but |
| qdisc_tree_reduce_backlog() is not called to update the parent's |
| q.qlen, leading to the similar use-after-free as Commit |
| e04991a48dbaf382 ("netem: fix return value if duplicate enqueue |
| fails") |
| |
| Commands to trigger KASAN UaF: |
| |
| ip link add type dummy |
| ip link set lo up |
| ip link set dummy0 up |
| tc qdisc add dev lo parent root handle 1: drr |
| tc filter add dev lo parent 1: basic classid 1:1 |
| tc class add dev lo classid 1:1 drr |
| tc qdisc add dev lo parent 1:1 handle 2: netem |
| tc qdisc add dev lo parent 2: handle 3: drr |
| tc filter add dev lo parent 3: basic classid 3:1 action mirred egress |
| redirect dev dummy0 |
| tc class add dev lo classid 3:1 drr |
| ping -c1 -W0.01 localhost # Trigger bug |
| tc class del dev lo classid 1:1 |
| tc class add dev lo classid 1:1 drr |
| ping -c1 -W0.01 localhost # UaF |
| |
| The Linux kernel CVE team has assigned CVE-2024-46800 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.3 with commit 50612537e9ab29693122fab20fc1eed235054ffe and fixed in 4.19.322 with commit f0bddb4de043399f16d1969dad5ee5b984a64e7b |
| Issue introduced in 3.3 with commit 50612537e9ab29693122fab20fc1eed235054ffe and fixed in 5.4.284 with commit 295ad5afd9efc5f67b86c64fce28fb94e26dc4c9 |
| Issue introduced in 3.3 with commit 50612537e9ab29693122fab20fc1eed235054ffe and fixed in 5.10.226 with commit 98c75d76187944296068d685dfd8a1e9fd8c4fdc |
| Issue introduced in 3.3 with commit 50612537e9ab29693122fab20fc1eed235054ffe and fixed in 5.15.167 with commit 14f91ab8d391f249b845916820a56f42cf747241 |
| Issue introduced in 3.3 with commit 50612537e9ab29693122fab20fc1eed235054ffe and fixed in 6.1.110 with commit db2c235682913a63054e741fe4e19645fdf2d68e |
| Issue introduced in 3.3 with commit 50612537e9ab29693122fab20fc1eed235054ffe and fixed in 6.6.51 with commit dde33a9d0b80aae0c69594d1f462515d7ff1cb3d |
| Issue introduced in 3.3 with commit 50612537e9ab29693122fab20fc1eed235054ffe and fixed in 6.10.10 with commit 32008ab989ddcff1a485fa2b4906234c25dc5cd6 |
| Issue introduced in 3.3 with commit 50612537e9ab29693122fab20fc1eed235054ffe and fixed in 6.11 with commit 3b3a2a9c6349e25a025d2330f479bc33a6ccb54a |
| |
| 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-2024-46800 |
| 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/sched/sch_netem.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/f0bddb4de043399f16d1969dad5ee5b984a64e7b |
| https://git.kernel.org/stable/c/295ad5afd9efc5f67b86c64fce28fb94e26dc4c9 |
| https://git.kernel.org/stable/c/98c75d76187944296068d685dfd8a1e9fd8c4fdc |
| https://git.kernel.org/stable/c/14f91ab8d391f249b845916820a56f42cf747241 |
| https://git.kernel.org/stable/c/db2c235682913a63054e741fe4e19645fdf2d68e |
| https://git.kernel.org/stable/c/dde33a9d0b80aae0c69594d1f462515d7ff1cb3d |
| https://git.kernel.org/stable/c/32008ab989ddcff1a485fa2b4906234c25dc5cd6 |
| https://git.kernel.org/stable/c/3b3a2a9c6349e25a025d2330f479bc33a6ccb54a |
