First published: Wed Sep 18 2024(Updated: )
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
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Software | Affected Version | How to fix |
---|---|---|
Linux Kernel | >=3.3<4.19.322 | |
Linux Kernel | >=4.20<5.4.284 | |
Linux Kernel | >=5.5<5.10.226 | |
Linux Kernel | >=5.11<5.15.167 | |
Linux Kernel | >=5.16<6.1.110 | |
Linux Kernel | >=6.2<6.6.51 | |
Linux Kernel | >=6.7<6.10.10 | |
Linux Kernel | =6.11-rc1 | |
Linux Kernel | =6.11-rc2 | |
Linux Kernel | =6.11-rc3 | |
Linux Kernel | =6.11-rc4 | |
Linux Kernel | =6.11-rc5 | |
Linux Kernel | =6.11-rc6 | |
debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
debian/linux-6.1 | 6.1.129-1~deb11u1 |
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CVE-2024-46800 has been assigned a severity rating which indicates a significant risk associated with a use after free vulnerability in the Linux kernel.
To remediate CVE-2024-46800, it is necessary to upgrade the Linux kernel to a patched version that includes the fix for this vulnerability.
CVE-2024-46800 affects various versions of the Linux kernel prior to the fixed versions listed by the relevant vendor.
CVE-2024-46800 could potentially be exploitable remotely depending on the specific configurations and use cases of the affected kernel.
CVE-2024-46800 specifically affects the sch/netem component of the Linux kernel related to packet scheduling.