CVE-2024-45016High· 7.8▾ TwilightIn 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_…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Oct 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.3%
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:
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.
linux_kernel >= 5.0, < 5.4.283linux_kernel >= 5.5, < 5.10.225linux_kernel >= 5.11, < 5.15.166linux_kernel >= 5.16, < 6.1.107linux_kernel >= 6.2, < 6.6.48linux_kernel >= 6.7, < 6.10.7linux_kernel = 6.11Upgrade past the affected range:
linux_kernel 6.10.7Connected by shared product, vendor, weakness, or advisory.
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