7.8

CVE-2024-46800

sch/netem: fix use after free in netem_dequeue

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
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 3.3 < 4.19.322
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.284
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.226
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.167
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.110
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.51
Linux ≫ Linux Kernel Version >= 6.7 < 6.10.10
Linux ≫ Linux Kernel Version6.11 Updaterc1
Linux ≫ Linux Kernel Version6.11 Updaterc2
Linux ≫ Linux Kernel Version6.11 Updaterc3
Linux ≫ Linux Kernel Version6.11 Updaterc4
Linux ≫ Linux Kernel Version6.11 Updaterc5
Linux ≫ Linux Kernel Version6.11 Updaterc6
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.27% 0.181
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/14f91ab8d391f249b845916820a56f42cf747241
Patch
https://git.kernel.org/stable/c/295ad5afd9efc5f67b86c64fce28fb94e26dc4c9
Patch
https://git.kernel.org/stable/c/32008ab989ddcff1a485fa2b4906234c25dc5cd6
Patch
https://git.kernel.org/stable/c/3b3a2a9c6349e25a025d2330f479bc33a6ccb54a
Patch
https://git.kernel.org/stable/c/98c75d76187944296068d685dfd8a1e9fd8c4fdc
Patch
https://git.kernel.org/stable/c/db2c235682913a63054e741fe4e19645fdf2d68e
Patch
https://git.kernel.org/stable/c/dde33a9d0b80aae0c69594d1f462515d7ff1cb3d
Patch
https://git.kernel.org/stable/c/f0bddb4de043399f16d1969dad5ee5b984a64e7b
Patch
https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html