CVE-2024-26834

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

MEDIUM

5.5

CVSS Score

Published: April 17, 2024 at 10:10 AM UTC

Updated: August 5, 2026 at 12:04 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

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] [<00000000d9b2fb60>] nft_flow_offload_eval+0x4e8/0x700 [nft_flow_offload] [<000000009f447dbb>] expr_call_ops_eval+0x53/0x330 [nf_tables] [<00000000072e1be6>] nft_do_chain+0x17c/0x840 [nf_tables] [<00000000d0551029>] nft_do_chain_inet+0xa1/0x210 [nf_tables] [<0000000097c9d5c6>] nf_hook_slow+0x5b/0x160 [<0000000005eccab1>] ip_forward+0x8b6/0x9b0 [<00000000553a269b>] ip_rcv+0x221/0x230 [<00000000412872e5>] __netif_receive_skb_one_core+0xfe/0x110

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

6.5 ≤ v < 6.6.196.5 ≤ v < 6.7.76.5 ≤ v < 6.86.7 ≤ v < 6.7.76.8 rc1 6.8 rc2 6.8 rc3 6.8 rc4 6.8 rc57c71b831220edeab7ce603d818dc1708d9ea41379c5662e95a8dcc232c3ef4deb21033badcd260f6fa502c86566680ac62bc28ec883a069bf7a2aa5e

Vendor states this is fixed in 13b57b5cd591d5b22f9bbf047b2922967de411f3 (fixed)

Vendor states this is fixed in 2d17cf10179a7de6d8f0128168b84ad0b4a1863f (fixed)

Vendor states this is fixed in 8762785f459be1cfe6fcf7285c123aad6a3703f0 (fixed)

Vendor states this is fixed in 9256ab9232e35a16af9c30fa4e522e6d1bd3605a (fixed)

Vendor states this is fixed in a6cafdb49a7bbf4a88367db209703eee6941e023 (fixed)

Vendor states this is fixed in 6.5 (unaffected)

Vendor states this is fixed in 6.6.19 (unaffected)

Vendor states this is fixed in 6.7.7 (unaffected)

Vendor states this is fixed in 6.8 (unaffected)