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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-45016

netem: fix return value if duplicate enqueue fails

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: netem: fix return value if duplicate enqueue fails There is a bug in netem_enqueue() introduced by commit 5845f706388a ("net: netem: fix skb length BUG_ON in __skb_to_sgvec") that can lead to a use-after-free. This commit made netem_enqueue() always return NET_XMIT_SUCCESS when a packet is duplicated, which can cause the parent qdisc's q.qlen to be mistakenly incremented. When this happens qlen_notify() may be skipped on the parent during destruction, leaving a dangling pointer for some classful qdiscs like DRR. There are two ways for the bug happen: - If the duplicated packet is dropped by rootq->enqueue() and then the original packet is also dropped. - If rootq->enqueue() sends the duplicated packet to a different qdisc and the original packet is dropped. In both cases NET_XMIT_SUCCESS is returned even though no packets are enqueued at the netem qdisc. The fix is to defer the enqueue of the duplicate packet until after the original packet has been guaranteed to return NET_XMIT_SUCCESS.

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

  • 5845f706388a4cde0f6b80f9e5d33527e942b7d9 to < 759e3e8c4a6a6b4e52ebc4547123a457f0ce90d4affected
  • 5845f706388a4cde0f6b80f9e5d33527e942b7d9 to < c414000da1c2ea1ba9a5e5bb1a4ba774e51e202daffected
  • 5845f706388a4cde0f6b80f9e5d33527e942b7d9 to < 52d99a69f3d556c6426048c9d481b912205919d8affected
  • 5845f706388a4cde0f6b80f9e5d33527e942b7d9 to < 0486d31dd8198e22b63a4730244b38fffce6d469affected
  • 5845f706388a4cde0f6b80f9e5d33527e942b7d9 to < 577d6c0619467fe90f7e8e57e45cb5bd9d936014affected
  • 5845f706388a4cde0f6b80f9e5d33527e942b7d9 to < e5bb2988a310667abed66c7d3ffa28880cf0f883affected
  • 5845f706388a4cde0f6b80f9e5d33527e942b7d9 to < c07ff8592d57ed258afee5a5e04991a48dbaf382affected
  • a550a01b8af856f2684b0f79d552f5119eb5006caffected
  • 009510a90e230bb495f3fe25c7db956679263b07affected
  • 4de7d30668cb8b06330992e1cd336f91700a2ce7affected
  • d1dd2e15c85e890a1cc9bde5ba07ae63331e5c73affected
  • 0148fe458b5705e2fea7cb88294fed7e36066ca2affected
  • 3.16.66 to < 3.17affected
  • 4.9.163 to < 4.10affected
  • 4.14.106 to < 4.15affected
  • 4.19.28 to < 4.20affected
  • 4.20.15 to < 4.21affected

Linux Linux

Default version status: affected

  • 5.0affected
  • 0 to < 5.0unaffected
  • 5.4.283 to ≤ 5.4.*unaffected
  • 5.10.225 to ≤ 5.10.*unaffected
  • 5.15.166 to ≤ 5.15.*unaffected
  • 6.1.107 to ≤ 6.1.*unaffected
  • 6.6.48 to ≤ 6.6.*unaffected
  • 6.10.7 to ≤ 6.10.*unaffected
  • 6.11 to ≤ *unaffected

References