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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-46800

sch/netem: fix use after free in netem_dequeue

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Status
Published
Published
Updated
Assigning organization
Linux

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

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 50612537e9ab29693122fab20fc1eed235054ffe to < f0bddb4de043399f16d1969dad5ee5b984a64e7baffected
  • 50612537e9ab29693122fab20fc1eed235054ffe to < 295ad5afd9efc5f67b86c64fce28fb94e26dc4c9affected
  • 50612537e9ab29693122fab20fc1eed235054ffe to < 98c75d76187944296068d685dfd8a1e9fd8c4fdcaffected
  • 50612537e9ab29693122fab20fc1eed235054ffe to < 14f91ab8d391f249b845916820a56f42cf747241affected
  • 50612537e9ab29693122fab20fc1eed235054ffe to < db2c235682913a63054e741fe4e19645fdf2d68eaffected
  • 50612537e9ab29693122fab20fc1eed235054ffe to < dde33a9d0b80aae0c69594d1f462515d7ff1cb3daffected
  • 50612537e9ab29693122fab20fc1eed235054ffe to < 32008ab989ddcff1a485fa2b4906234c25dc5cd6affected
  • 50612537e9ab29693122fab20fc1eed235054ffe to < 3b3a2a9c6349e25a025d2330f479bc33a6ccb54aaffected

Linux Linux

Default version status: affected

  • 3.3affected
  • 0 to < 3.3unaffected
  • 4.19.322 to ≤ 4.19.*unaffected
  • 5.4.284 to ≤ 5.4.*unaffected
  • 5.10.226 to ≤ 5.10.*unaffected
  • 5.15.167 to ≤ 5.15.*unaffected
  • 6.1.110 to ≤ 6.1.*unaffected
  • 6.6.51 to ≤ 6.6.*unaffected
  • 6.10.10 to ≤ 6.10.*unaffected
  • 6.11 to ≤ *unaffected

References