CVE-2026-23171

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> bonding: fix use-after-free due to enslave fail after slave array update<br /> <br /> Fix a use-after-free which happens due to enslave failure after the new<br /> slave has been added to the array. Since the new slave can be used for Tx<br /> immediately, we can use it after it has been freed by the enslave error<br /> cleanup path which frees the allocated slave memory. Slave update array is<br /> supposed to be called last when further enslave failures are not expected.<br /> Move it after xdp setup to avoid any problems.<br /> <br /> It is very easy to reproduce the problem with a simple xdp_pass prog:<br /> ip l add bond1 type bond mode balance-xor<br /> ip l set bond1 up<br /> ip l set dev bond1 xdp object xdp_pass.o sec xdp_pass<br /> ip l add dumdum type dummy<br /> <br /> Then run in parallel:<br /> while :; do ip l set dumdum master bond1 1&gt;/dev/null 2&gt;&amp;1; done;<br /> mausezahn bond1 -a own -b rand -A rand -B 1.1.1.1 -c 0 -t tcp "dp=1-1023, flags=syn"<br /> <br /> The crash happens almost immediately:<br /> [ 605.602850] Oops: general protection fault, probably for non-canonical address 0xe0e6fc2460000137: 0000 [#1] SMP KASAN NOPTI<br /> [ 605.602916] KASAN: maybe wild-memory-access in range [0x07380123000009b8-0x07380123000009bf]<br /> [ 605.602946] CPU: 0 UID: 0 PID: 2445 Comm: mausezahn Kdump: loaded Tainted: G B 6.19.0-rc6+ #21 PREEMPT(voluntary)<br /> [ 605.602979] Tainted: [B]=BAD_PAGE<br /> [ 605.602998] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014<br /> [ 605.603032] RIP: 0010:netdev_core_pick_tx+0xcd/0x210<br /> [ 605.603063] Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 3e 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 6b 08 49 8d 7d 30 48 89 fa 48 c1 ea 03 3c 02 00 0f 85 25 01 00 00 49 8b 45 30 4c 89 e2 48 89 ee 48 89<br /> [ 605.603111] RSP: 0018:ffff88817b9af348 EFLAGS: 00010213<br /> [ 605.603145] RAX: dffffc0000000000 RBX: ffff88817d28b420 RCX: 0000000000000000<br /> [ 605.603172] RDX: 00e7002460000137 RSI: 0000000000000008 RDI: 07380123000009be<br /> [ 605.603199] RBP: ffff88817b541a00 R08: 0000000000000001 R09: fffffbfff3ed8c0c<br /> [ 605.603226] R10: ffffffff9f6c6067 R11: 0000000000000001 R12: 0000000000000000<br /> [ 605.603253] R13: 073801230000098e R14: ffff88817d28b448 R15: ffff88817b541a84<br /> [ 605.603286] FS: 00007f6570ef67c0(0000) GS:ffff888221dfa000(0000) knlGS:0000000000000000<br /> [ 605.603319] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> [ 605.603343] CR2: 00007f65712fae40 CR3: 000000011371b000 CR4: 0000000000350ef0<br /> [ 605.603373] Call Trace:<br /> [ 605.603392] <br /> [ 605.603410] __dev_queue_xmit+0x448/0x32a0<br /> [ 605.603434] ? __pfx_vprintk_emit+0x10/0x10<br /> [ 605.603461] ? __pfx_vprintk_emit+0x10/0x10<br /> [ 605.603484] ? __pfx___dev_queue_xmit+0x10/0x10<br /> [ 605.603507] ? bond_start_xmit+0xbfb/0xc20 [bonding]<br /> [ 605.603546] ? _printk+0xcb/0x100<br /> [ 605.603566] ? __pfx__printk+0x10/0x10<br /> [ 605.603589] ? bond_start_xmit+0xbfb/0xc20 [bonding]<br /> [ 605.603627] ? add_taint+0x5e/0x70<br /> [ 605.603648] ? add_taint+0x2a/0x70<br /> [ 605.603670] ? end_report.cold+0x51/0x75<br /> [ 605.603693] ? bond_start_xmit+0xbfb/0xc20 [bonding]<br /> [ 605.603731] bond_start_xmit+0x623/0xc20 [bonding]