CVE-2024-26834

/// Technical description

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

netfilter: nft_flow_offload: release dst in case direct xmit path is used

Direct xmit does not use it since it calls dev_queue_xmit() to send

packets, hence it calls dst_release().

kmemleak reports:

unreferenced object 0xffff88814f440900 (size 184):

comm "softirq", pid 0, jiffies 4294951896

hex dump (first 32 bytes):

00 60 5b 04 81 88 ff ff 00 e6 e8 82 ff ff ff ff .`[.............

21 0b 50 82 ff ff ff ff 00 00 00 00 00 00 00 00 !.P.............

backtrace (crc cb2bf5d6):

[<000000003ee17107>] kmem_cache_alloc+0x286/0x340

[<0000000021a5de2c>] dst_alloc+0x43/0xb0

[<00000000f0671159>] rt_dst_alloc+0x2e/0x190

[<00000000fe5092c9>] __mkroute_output+0x244/0x980

[<000000005fb96fb0>] ip_route_output_flow+0xc0/0x160

[<0000000045367433>] nf_ip_route+0xf/0x30

[<0000000085da1d8e>] nf_route+0x2d/0x60

[<00000000d1ecd1cb>] nft_flow_route+0x171/0x6a0 [nft_flow_offload]

[<00000000d9b

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References