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Echo: linux: security update to 6.1.170-1

high Tenable Cloud Security Plugin ID 459259

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - In the Linux kernel, the following vulnerability has been resolved: net/smc: fix double-free of
 smc_spd_priv when tee() duplicates splice pipe buffer smc_rx_splice() allocates one smc_spd_priv per
 pipe_buffer and stores the pointer in pipe_buffer.private. The pipe_buf_operations for these buffers used
 .get = generic_pipe_buf_get, which only increments the page reference count when tee(2) duplicates a pipe
 buffer. The smc_spd_priv pointer itself was not handled, so after tee() both the original and the cloned
 pipe_buffer share the same smc_spd_priv *. When both pipes are subsequently released,
 smc_rx_pipe_buf_release() is called twice against the same object: 1st call: kfree(priv) sock_put(sk)
 smc_rx_update_cons() [correct] 2nd call: kfree(priv) sock_put(sk) smc_rx_update_cons() [UAF] KASAN reports
 a slab-use-after-free in smc_rx_pipe_buf_release(), which then escalates to a NULL-pointer dereference and
 kernel panic via smc_rx_update_consumer() when it chases the freed priv->smc pointer: BUG: KASAN: slab-
 use-after-free in smc_rx_pipe_buf_release+0x78/0x2a0 Read of size 8 at addr ffff888004a45740 by task
 smc_splice_tee_/74 Call Trace: <TASK> dump_stack_lvl+0x53/0x70 print_report+0xce/0x650
 kasan_report+0xc6/0x100 smc_rx_pipe_buf_release+0x78/0x2a0 free_pipe_info+0xd4/0x130
 pipe_release+0x142/0x160 __fput+0x1c6/0x490 __x64_sys_close+0x4f/0x90 do_syscall_64+0xa6/0x1a0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> BUG: kernel NULL pointer dereference, address:
 0000000000000020 RIP: 0010:smc_rx_update_consumer+0x8d/0x350 Call Trace: <TASK>
 smc_rx_pipe_buf_release+0x121/0x2a0 free_pipe_info+0xd4/0x130 pipe_release+0x142/0x160 __fput+0x1c6/0x490
 __x64_sys_close+0x4f/0x90 do_syscall_64+0xa6/0x1a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> Kernel
 panic - not syncing: Fatal exception Beyond the memory-safety problem, duplicating an SMC splice buffer is
 semantically questionable: smc_rx_update_cons() would advance the consumer cursor twice for the same data,
 corrupting receive-window accounting. A refcount on smc_spd_priv could fix the double-free, but the
 cursor-accounting issue would still need to be addressed separately. The .get callback is invoked by both
 tee(2) and splice_pipe_to_pipe() for partial transfers; both will now return -EFAULT. Users who need to
 duplicate SMC socket data must use a copy-based read path. (CVE-2026-31507)

Solution

Update the linux library and its related packages to version 6.1.170-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-31507

Plugin Details

Severity: High

ID: 459259

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.92

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-31507

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/1/2026

Vulnerability Publication Date: 4/22/2026

Reference Information

CVE: CVE-2026-31507