CVE-2025-38161

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

RDMA/mlx5: Fix error flow upon firmware failure for RQ destruction

Upon RQ destruction if the firmware command fails which is the

last resource to be destroyed some SW resources were already cleaned

regardless of the failure.

Now properly rollback the object to its original state upon such failure.

In order to avoid a use-after free in case someone tries to destroy the

object again, which results in the following kernel trace:

refcount_t: underflow; use-after-free.

WARNING: CPU: 0 PID: 37589 at lib/refcount.c:28 refcount_warn_saturate+0xf4/0x148

Modules linked in: rdma_ucm(OE) rdma_cm(OE) iw_cm(OE) ib_ipoib(OE) ib_cm(OE) ib_umad(OE) mlx5_ib(OE) rfkill mlx5_core(OE) mlxdevm(OE) ib_uverbs(OE) ib_core(OE) psample mlxfw(OE) mlx_compat(OE) macsec tls pci_hyperv_intf sunrpc vfat fat virtio_net net_failover failover fuse loop nfnetlink vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vmw_vmci vsock xfs crct10dif_ce ghash_ce sha2_ce sha256_arm64 sha1_ce virtio_console virtio_gpu virtio_blk virtio_dma_buf virtio_mmio dm_mirror dm_region_hash dm_log dm_mod xpmem(OE)

CPU: 0 UID: 0 PID: 37589 Comm: python3 Kdump: loaded Tainted: G OE ------- --- 6.12.0-54.el10.aarch64 #1

Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE

Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015

pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)

pc : refcount_warn_saturate+0xf4/0x148

lr : refcount_warn_saturate+0xf4/0x148

sp : ffff80008b81b7e0

x29: ffff80008b81b7e0 x28: ffff000133d51600 x27: 0000000000000001

x26: 0000000000000000 x25: 00000000ffffffea x24: ffff00010ae80f00

x23: ffff00010ae80f80 x22: ffff0000c66e5d08 x21: 0000000000000000

x20: ffff0000c66e0000 x19: ffff00010ae80340 x18: 0000000000000006

x17: 0000000000000000 x16: 0000000000000020 x15: ffff80008b81b37f

x14: 0000000000000000 x13: 2e656572662d7265 x12: ffff80008283ef78

x11: ffff80008257efd0 x10: ffff80008283efd0 x9 : ffff80008021ed90

x8 : 0000000000000001 x7 : 00000000000bffe8 x6 : c0000000ffff7fff

x5 : ffff0001fb8e3408 x4 : 0000000000000000 x3 : ffff800179993000

x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff000133d51600

Call trace:

refcount_warn_saturate+0xf4/0x148

mlx5_core_put_rsc+0x88/0xa0 [mlx5_ib]

mlx5_core_destroy_rq_tracked+0x64/0x98 [mlx5_ib]

mlx5_ib_destroy_wq+0x34/0x80 [mlx5_ib]

ib_destroy_wq_user+0x30/0xc0 [ib_core]

uverbs_free_wq+0x28/0x58 [ib_uverbs]

destroy_hw_idr_uobject+0x34/0x78 [ib_uverbs]

uverbs_destroy_uobject+0x48/0x240 [ib_uverbs]

__uverbs_cleanup_ufile+0xd4/0x1a8 [ib_uverbs]

uverbs_destroy_ufile_hw+0x48/0x120 [ib_uverbs]

ib_uverbs_close+0x2c/0x100 [ib_uverbs]

__fput+0xd8/0x2f0

__fput_sync+0x50/0x70

__arm64_sys_close+0x40/0x90

invoke_syscall.constprop.0+0x74/0xd0

do_el0_svc+0x48/0xe8

el0_svc+0x44/0x1d0

el0t_64_sync_handler+0x120/0x130

el0t_64_sync+0x1a4/0x1a8