CVE-2024-26834

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

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

Direct xmit does not use it since it calls devqueuexmit() 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>] kmemcachealloc+0x286/0x340 [<0000000021a5de2c>] dstalloc+0x43/0xb0 [<00000000f0671159>] rtdstalloc+0x2e/0x190 [<00000000fe5092c9>] _mkrouteoutput+0x244/0x980 [<000000005fb96fb0>] iprouteoutputflow+0xc0/0x160 [<0000000045367433>] nfiproute+0xf/0x30 [<0000000085da1d8e>] nfroute+0x2d/0x60 [<00000000d1ecd1cb>] nftflowroute+0x171/0x6a0 [nftflowoffload] [<00000000d9b2fb60>] nftflowoffloadeval+0x4e8/0x700 [nftflowoffload] [<000000009f447dbb>] exprcallopseval+0x53/0x330 [nftables] [<00000000072e1be6>] nftdochain+0x17c/0x840 [nftables] [<00000000d0551029>] nftdochaininet+0xa1/0x210 [nftables] [<0000000097c9d5c6>] nfhookslow+0x5b/0x160 [<0000000005eccab1>] ipforward+0x8b6/0x9b0 [<00000000553a269b>] iprcv+0x221/0x230 [<00000000412872e5>] _netifreceiveskbonecore+0xfe/0x110