Description

In the Linux kernel, the following vulnerability has been resolved:

gro: fix ownership transfer

If packets are GROed with fraglist they might be segmented later on and
continue their journey in the stack. In skb_segment_list those skbs can
be reused as-is. This is an issue as their destructor was removed in
skb_gro_receive_list but not the reference to their socket, and then
they can't be orphaned. Fix this by also removing the reference to the
socket.

For example this could be observed,

kernel BUG at include/linux/skbuff.h:3131! (skb_orphan)
RIP: 0010:ip6_rcv_core+0x11bc/0x19a0
Call Trace:
ipv6_list_rcv+0x250/0x3f0
__netif_receive_skb_list_core+0x49d/0x8f0
netif_receive_skb_list_internal+0x634/0xd40
napi_complete_done+0x1d2/0x7d0
gro_cell_poll+0x118/0x1f0

A similar construction is found in skb_gro_receive, apply the same
change there.

Classification

CVE ID: CVE-2024-35890

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 17.81% (scored less or equal to compared to others)

EPSS Date: 2025-02-03 (when was this score calculated)

References

https://git.kernel.org/stable/c/d225b0ac96dc40d7e8ae2bc227eb2c56e130975f
https://git.kernel.org/stable/c/2eeab8c47c3c0276e0746bc382f405c9a236a5ad
https://git.kernel.org/stable/c/fc126c1d51e9552eacd2d717b9ffe9262a8a4cd6
https://git.kernel.org/stable/c/5b3b67f731296027cceb3efad881ae281213f86f
https://git.kernel.org/stable/c/ed4cccef64c1d0d5b91e69f7a8a6697c3a865486

Timeline