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THREATINT
PUBLISHED

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

Reserved 2024-09-11 | Published 2024-09-18 | Updated 2025-05-04 | Assigner Linux

Product status

Default status
unaffected

50612537e9ab29693122fab20fc1eed235054ffe before f0bddb4de043399f16d1969dad5ee5b984a64e7b
affected

50612537e9ab29693122fab20fc1eed235054ffe before 295ad5afd9efc5f67b86c64fce28fb94e26dc4c9
affected

50612537e9ab29693122fab20fc1eed235054ffe before 98c75d76187944296068d685dfd8a1e9fd8c4fdc
affected

50612537e9ab29693122fab20fc1eed235054ffe before 14f91ab8d391f249b845916820a56f42cf747241
affected

50612537e9ab29693122fab20fc1eed235054ffe before db2c235682913a63054e741fe4e19645fdf2d68e
affected

50612537e9ab29693122fab20fc1eed235054ffe before dde33a9d0b80aae0c69594d1f462515d7ff1cb3d
affected

50612537e9ab29693122fab20fc1eed235054ffe before 32008ab989ddcff1a485fa2b4906234c25dc5cd6
affected

50612537e9ab29693122fab20fc1eed235054ffe before 3b3a2a9c6349e25a025d2330f479bc33a6ccb54a
affected

Default status
affected

3.3
affected

Any version before 3.3
unaffected

4.19.322
unaffected

5.4.284
unaffected

5.10.226
unaffected

5.15.167
unaffected

6.1.110
unaffected

6.6.51
unaffected

6.10.10
unaffected

6.11
unaffected

References

git.kernel.org/...c/f0bddb4de043399f16d1969dad5ee5b984a64e7b

git.kernel.org/...c/295ad5afd9efc5f67b86c64fce28fb94e26dc4c9

git.kernel.org/...c/98c75d76187944296068d685dfd8a1e9fd8c4fdc

git.kernel.org/...c/14f91ab8d391f249b845916820a56f42cf747241

git.kernel.org/...c/db2c235682913a63054e741fe4e19645fdf2d68e

git.kernel.org/...c/dde33a9d0b80aae0c69594d1f462515d7ff1cb3d

git.kernel.org/...c/32008ab989ddcff1a485fa2b4906234c25dc5cd6

git.kernel.org/...c/3b3a2a9c6349e25a025d2330f479bc33a6ccb54a

cve.org (CVE-2024-46800)

nvd.nist.gov (CVE-2024-46800)

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