CVE-2024-46800: sch/netem: fix use after free in netem_dequeue
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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Reference Links
- https://launchpad.net/bugs/cve/CVE-2024-46800
- 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
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-46800
- https://nvd.nist.gov/vuln/detail/CVE-2024-46800
- https://security-tracker.debian.org/tracker/CVE-2024-46800
- https://ubuntu.com/security/CVE-2024-46800
- https://chromereleases.googleblog.com/2025/02/long-term-support-channel-update-for_26.html (Advisory)
- https://git.kernel.org/linus/3b3a2a9c6349e25a025d2330f479bc33a6ccb54a
Frequently Asked Questions
What is the severity of CVE-2024-46800?
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.
How do I fix CVE-2024-46800?
To remediate CVE-2024-46800, it is necessary to upgrade the Linux kernel to a patched version that includes the fix for this vulnerability.
Which versions of the Linux kernel are affected by CVE-2024-46800?
CVE-2024-46800 affects various versions of the Linux kernel prior to the fixed versions listed by the relevant vendor.
Is CVE-2024-46800 exploitable remotely?
CVE-2024-46800 could potentially be exploitable remotely depending on the specific configurations and use cases of the affected kernel.
What components are impacted by CVE-2024-46800?
CVE-2024-46800 specifically affects the sch/netem component of the Linux kernel related to packet scheduling.
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