1224865 – (CVE-2021-47247) VUL-0: CVE-2021-47247: kernel: net/mlx5e: Fix use-after-free of encap entry in neigh update handler

Bug 1224865 (CVE-2021-47247) - VUL-0: CVE-2021-47247: kernel: net/mlx5e: Fix use-after-free of encap entry in neigh update handler

Summary: VUL-0: CVE-2021-47247: kernel: net/mlx5e: Fix use-after-free of encap entry i...

Status:	RESOLVED FIXED

Alias:	CVE-2021-47247

Product:	SUSE Security Incidents
Classification:	Novell Products
Component:	Incidents (show other bugs)
Version:	unspecified
Hardware:	Other Other

Priority:	P2 - High Severity: Major
Target Milestone:	---
Assignee:	Security Team bot
QA Contact:	Security Team bot

URL:	https://smash.suse.de/issue/406876/
Whiteboard:	CVSSv3.1:SUSE:CVE-2021-47247:7.8:(AV:...
Keywords:

Depends on:
Blocks:	1227500
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Reported:	2024-05-22 09:09 UTC by SMASH SMASH
Modified:	2024-07-19 14:10 UTC (History)
CC List:	4 users (show)

See Also:
Found By:	Security Response Team
Services Priority:
Business Priority:
Blocker:	---
Marketing QA Status:	---
IT Deployment:	---

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Description SMASH SMASH 2024-05-22 09:09:53 UTC

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

net/mlx5e: Fix use-after-free of encap entry in neigh update handler

Function mlx5e_rep_neigh_update() wasn't updated to accommodate rtnl lock
removal from TC filter update path and properly handle concurrent encap
entry insertion/deletion which can lead to following use-after-free:

 [23827.464923] ==================================================================
 [23827.469446] BUG: KASAN: use-after-free in mlx5e_encap_take+0x72/0x140 [mlx5_core]
 [23827.470971] Read of size 4 at addr ffff8881d132228c by task kworker/u20:6/21635
 [23827.472251]
 [23827.472615] CPU: 9 PID: 21635 Comm: kworker/u20:6 Not tainted 5.13.0-rc3+ #5
 [23827.473788] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
 [23827.475639] Workqueue: mlx5e mlx5e_rep_neigh_update [mlx5_core]
 [23827.476731] Call Trace:
 [23827.477260]  dump_stack+0xbb/0x107
 [23827.477906]  print_address_description.constprop.0+0x18/0x140
 [23827.478896]  ? mlx5e_encap_take+0x72/0x140 [mlx5_core]
 [23827.479879]  ? mlx5e_encap_take+0x72/0x140 [mlx5_core]
 [23827.480905]  kasan_report.cold+0x7c/0xd8
 [23827.481701]  ? mlx5e_encap_take+0x72/0x140 [mlx5_core]
 [23827.482744]  kasan_check_range+0x145/0x1a0
 [23827.493112]  mlx5e_encap_take+0x72/0x140 [mlx5_core]
 [23827.494054]  ? mlx5e_tc_tun_encap_info_equal_generic+0x140/0x140 [mlx5_core]
 [23827.495296]  mlx5e_rep_neigh_update+0x41e/0x5e0 [mlx5_core]
 [23827.496338]  ? mlx5e_rep_neigh_entry_release+0xb80/0xb80 [mlx5_core]
 [23827.497486]  ? read_word_at_a_time+0xe/0x20
 [23827.498250]  ? strscpy+0xa0/0x2a0
 [23827.498889]  process_one_work+0x8ac/0x14e0
 [23827.499638]  ? lockdep_hardirqs_on_prepare+0x400/0x400
 [23827.500537]  ? pwq_dec_nr_in_flight+0x2c0/0x2c0
 [23827.501359]  ? rwlock_bug.part.0+0x90/0x90
 [23827.502116]  worker_thread+0x53b/0x1220
 [23827.502831]  ? process_one_work+0x14e0/0x14e0
 [23827.503627]  kthread+0x328/0x3f0
 [23827.504254]  ? _raw_spin_unlock_irq+0x24/0x40
 [23827.505065]  ? __kthread_bind_mask+0x90/0x90
 [23827.505912]  ret_from_fork+0x1f/0x30
 [23827.506621]
 [23827.506987] Allocated by task 28248:
 [23827.507694]  kasan_save_stack+0x1b/0x40
 [23827.508476]  __kasan_kmalloc+0x7c/0x90
 [23827.509197]  mlx5e_attach_encap+0xde1/0x1d40 [mlx5_core]
 [23827.510194]  mlx5e_tc_add_fdb_flow+0x397/0xc40 [mlx5_core]
 [23827.511218]  __mlx5e_add_fdb_flow+0x519/0xb30 [mlx5_core]
 [23827.512234]  mlx5e_configure_flower+0x191c/0x4870 [mlx5_core]
 [23827.513298]  tc_setup_cb_add+0x1d5/0x420
 [23827.514023]  fl_hw_replace_filter+0x382/0x6a0 [cls_flower]
 [23827.514975]  fl_change+0x2ceb/0x4a51 [cls_flower]
 [23827.515821]  tc_new_tfilter+0x89a/0x2070
 [23827.516548]  rtnetlink_rcv_msg+0x644/0x8c0
 [23827.517300]  netlink_rcv_skb+0x11d/0x340
 [23827.518021]  netlink_unicast+0x42b/0x700
 [23827.518742]  netlink_sendmsg+0x743/0xc20
 [23827.519467]  sock_sendmsg+0xb2/0xe0
 [23827.520131]  ____sys_sendmsg+0x590/0x770
 [23827.520851]  ___sys_sendmsg+0xd8/0x160
 [23827.521552]  __sys_sendmsg+0xb7/0x140
 [23827.522238]  do_syscall_64+0x3a/0x70
 [23827.522907]  entry_SYSCALL_64_after_hwframe+0x44/0xae
 [23827.523797]
 [23827.524163] Freed by task 25948:
 [23827.524780]  kasan_save_stack+0x1b/0x40
 [23827.525488]  kasan_set_track+0x1c/0x30
 [23827.526187]  kasan_set_free_info+0x20/0x30
 [23827.526968]  __kasan_slab_free+0xed/0x130
 [23827.527709]  slab_free_freelist_hook+0xcf/0x1d0
 [23827.528528]  kmem_cache_free_bulk+0x33a/0x6e0
 [23827.529317]  kfree_rcu_work+0x55f/0xb70
 [23827.530024]  process_one_work+0x8ac/0x14e0
 [23827.530770]  worker_thread+0x53b/0x1220
 [23827.531480]  kthread+0x328/0x3f0
 [23827.532114]  ret_from_fork+0x1f/0x30
 [23827.532785]
 [23827.533147] Last potentially related work creation:
 [23827.534007]  kasan_save_stack+0x1b/0x40
 [23827.534710]  kasan_record_aux_stack+0xab/0xc0
 [23827.535492]  kvfree_call_rcu+0x31/0x7b0
 [23827.536206]  mlx5e_tc_del
---truncated---

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47247
https://www.cve.org/CVERecord?id=CVE-2021-47247
https://git.kernel.org/stable/c/b6447b72aca571632e71bb73a797118d5ce46a93
https://git.kernel.org/stable/c/fb1a3132ee1ac968316e45d21a48703a6db0b6c3
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2021/CVE-2021-47247.mbox

Comment 1 Joey Lee 2024-05-23 05:17:52 UTC

joeyli@linux-691t:/mnt/working/source_code-git/kernel-source> ./scripts/check-kernel-fix CVE-2021-47247
fb1a3132ee1a ("net/mlx5e: Fix use-after-free of encap entry in neigh update handler") merged v5.13-rc7~8^2~59^2~10
Fixes: 2a1f1768fa17 ("net/mlx5e: Refactor neigh update for concurrent execution") merged v5.4-rc1~131^2~176^2~4
Security fix for CVE-2021-47247 bsc#1224865 with CVSS 7.8
Experts candidates: tbogendoerfer@suse.de denis.kirjanov@suse.com 
..............................
ACTION NEEDED!
cve/linux-5.3-LTSS: MANUAL: backport fb1a3132ee1ac968316e45d21a48703a6db0b6c3 (Fixes 2a1f1768fa17)

Comment 2 Joey Lee 2024-05-23 05:18:23 UTC

Hi Denis,

Because this is a issue for net. Could you please help to handle it?

If this is not in your area, just reset bug assigner to kernel-bugs@suse.de. Kernel Security Sentinel will find other expert.

Thanks a lot!

Comment 10 Maintenance Automation 2024-07-09 16:30:15 UTC

SUSE-SU-2024:2365-1: An update that solves 38 vulnerabilities and has two security fixes can now be installed.

Category: security (important)
Bug References: 1171988, 1191958, 1195065, 1195254, 1202623, 1218148, 1219224, 1222015, 1223138, 1223384, 1224671, 1224703, 1224749, 1224764, 1224765, 1224766, 1224865, 1225010, 1225047, 1225109, 1225161, 1225184, 1225203, 1225487, 1225518, 1225611, 1225732, 1225749, 1225840, 1225866, 1226563, 1226587, 1226595, 1226670, 1226672, 1226712, 1226732, 1226758, 1226786, 1226962
CVE References: CVE-2020-10135, CVE-2021-3896, CVE-2021-43389, CVE-2021-4439, CVE-2021-47247, CVE-2021-47311, CVE-2021-47328, CVE-2021-47368, CVE-2021-47372, CVE-2021-47379, CVE-2021-47571, CVE-2021-47583, CVE-2022-0435, CVE-2022-22942, CVE-2022-2938, CVE-2022-48711, CVE-2022-48760, CVE-2022-48771, CVE-2023-24023, CVE-2023-52707, CVE-2023-52752, CVE-2023-52881, CVE-2024-26921, CVE-2024-26923, CVE-2024-35789, CVE-2024-35861, CVE-2024-35862, CVE-2024-35864, CVE-2024-35878, CVE-2024-35950, CVE-2024-36894, CVE-2024-36904, CVE-2024-36940, CVE-2024-36964, CVE-2024-38541, CVE-2024-38545, CVE-2024-38559, CVE-2024-38560
Maintenance Incident: [SUSE:Maintenance:34559](https://smelt.suse.de/incident/34559/)
Sources used:
SUSE Linux Enterprise Live Patching 15-SP2 (src):
 kernel-livepatch-SLE15-SP2_Update_50-1-150200.5.3.1
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS 15-SP2 (src):
 kernel-source-5.3.18-150200.24.197.1, kernel-default-base-5.3.18-150200.24.197.1.150200.9.101.1, kernel-syms-5.3.18-150200.24.197.1, kernel-obs-build-5.3.18-150200.24.197.1
SUSE Linux Enterprise Server 15 SP2 LTSS 15-SP2 (src):
 kernel-source-5.3.18-150200.24.197.1, kernel-default-base-5.3.18-150200.24.197.1.150200.9.101.1, kernel-syms-5.3.18-150200.24.197.1, kernel-obs-build-5.3.18-150200.24.197.1
SUSE Linux Enterprise Server for SAP Applications 15 SP2 (src):
 kernel-source-5.3.18-150200.24.197.1, kernel-default-base-5.3.18-150200.24.197.1.150200.9.101.1, kernel-syms-5.3.18-150200.24.197.1, kernel-obs-build-5.3.18-150200.24.197.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 11 Maintenance Automation 2024-07-09 16:32:12 UTC

SUSE-SU-2024:2362-1: An update that solves 72 vulnerabilities and has 10 security fixes can now be installed.

Category: security (important)
Bug References: 1156395, 1171988, 1176447, 1176774, 1181147, 1191958, 1195065, 1195254, 1195798, 1202623, 1218148, 1219224, 1219633, 1222015, 1223011, 1223384, 1224671, 1224703, 1224749, 1224764, 1224765, 1224766, 1224865, 1225010, 1225047, 1225109, 1225161, 1225184, 1225203, 1225487, 1225518, 1225611, 1225732, 1225749, 1225840, 1225866, 1226226, 1226537, 1226552, 1226554, 1226557, 1226558, 1226562, 1226563, 1226575, 1226583, 1226585, 1226587, 1226595, 1226614, 1226619, 1226621, 1226624, 1226643, 1226644, 1226645, 1226647, 1226650, 1226669, 1226670, 1226672, 1226674, 1226679, 1226686, 1226691, 1226692, 1226698, 1226703, 1226708, 1226709, 1226711, 1226712, 1226713, 1226715, 1226716, 1226720, 1226721, 1226732, 1226758, 1226762, 1226786, 1226962
CVE References: CVE-2021-3896, CVE-2021-43389, CVE-2021-4439, CVE-2021-47247, CVE-2021-47311, CVE-2021-47328, CVE-2021-47368, CVE-2021-47372, CVE-2021-47379, CVE-2021-47571, CVE-2021-47576, CVE-2021-47583, CVE-2021-47589, CVE-2021-47595, CVE-2021-47596, CVE-2021-47600, CVE-2021-47602, CVE-2021-47609, CVE-2021-47611, CVE-2021-47612, CVE-2021-47617, CVE-2021-47618, CVE-2021-47619, CVE-2021-47620, CVE-2022-0435, CVE-2022-22942, CVE-2022-2938, CVE-2022-48711, CVE-2022-48715, CVE-2022-48717, CVE-2022-48722, CVE-2022-48724, CVE-2022-48726, CVE-2022-48728, CVE-2022-48730, CVE-2022-48732, CVE-2022-48736, CVE-2022-48737, CVE-2022-48738, CVE-2022-48746, CVE-2022-48747, CVE-2022-48748, CVE-2022-48749, CVE-2022-48752, CVE-2022-48754, CVE-2022-48756, CVE-2022-48758, CVE-2022-48759, CVE-2022-48760, CVE-2022-48767, CVE-2022-48768, CVE-2022-48771, CVE-2023-24023, CVE-2023-52707, CVE-2023-52752, CVE-2023-52881, CVE-2024-26822, CVE-2024-26923, CVE-2024-35789, CVE-2024-35861, CVE-2024-35862, CVE-2024-35864, CVE-2024-35878, CVE-2024-35950, CVE-2024-36894, CVE-2024-36904, CVE-2024-36940, CVE-2024-36964, CVE-2024-38541, CVE-2024-38545, CVE-2024-38559, CVE-2024-38560
Maintenance Incident: [SUSE:Maintenance:34562](https://smelt.suse.de/incident/34562/)
Sources used:
openSUSE Leap 15.3 (src):
 kernel-obs-build-5.3.18-150300.59.167.1, kernel-livepatch-SLE15-SP3_Update_46-1-150300.7.3.1, kernel-default-base-5.3.18-150300.59.167.1.150300.18.98.1, kernel-source-5.3.18-150300.59.167.1, kernel-obs-qa-5.3.18-150300.59.167.1, kernel-syms-5.3.18-150300.59.167.1
SUSE Linux Enterprise Live Patching 15-SP3 (src):
 kernel-livepatch-SLE15-SP3_Update_46-1-150300.7.3.1
SUSE Linux Enterprise High Performance Computing LTSS 15 SP3 (src):
 kernel-source-5.3.18-150300.59.167.1, kernel-obs-build-5.3.18-150300.59.167.1, kernel-default-base-5.3.18-150300.59.167.1.150300.18.98.1, kernel-syms-5.3.18-150300.59.167.1
SUSE Linux Enterprise Server 15 SP3 LTSS 15-SP3 (src):
 kernel-source-5.3.18-150300.59.167.1, kernel-obs-build-5.3.18-150300.59.167.1, kernel-default-base-5.3.18-150300.59.167.1.150300.18.98.1, kernel-syms-5.3.18-150300.59.167.1
SUSE Linux Enterprise Server for SAP Applications 15 SP3 (src):
 kernel-source-5.3.18-150300.59.167.1, kernel-obs-build-5.3.18-150300.59.167.1, kernel-default-base-5.3.18-150300.59.167.1.150300.18.98.1, kernel-syms-5.3.18-150300.59.167.1
SUSE Enterprise Storage 7.1 (src):
 kernel-source-5.3.18-150300.59.167.1, kernel-obs-build-5.3.18-150300.59.167.1, kernel-default-base-5.3.18-150300.59.167.1.150300.18.98.1, kernel-syms-5.3.18-150300.59.167.1
SUSE Linux Enterprise Micro 5.1 (src):
 kernel-default-base-5.3.18-150300.59.167.1.150300.18.98.1
SUSE Linux Enterprise Micro 5.2 (src):
 kernel-default-base-5.3.18-150300.59.167.1.150300.18.98.1
SUSE Linux Enterprise Micro for Rancher 5.2 (src):
 kernel-default-base-5.3.18-150300.59.167.1.150300.18.98.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 12 Maintenance Automation 2024-07-10 16:30:36 UTC

SUSE-SU-2024:2384-1: An update that solves 68 vulnerabilities and has 13 security fixes can now be installed.

Category: security (important)
Bug References: 1156395, 1171988, 1176447, 1176774, 1181147, 1191958, 1195065, 1195254, 1195798, 1202623, 1218148, 1219224, 1219633, 1222015, 1223011, 1224671, 1224703, 1224749, 1224764, 1224765, 1224766, 1224865, 1225010, 1225047, 1225109, 1225161, 1225184, 1225203, 1225487, 1225518, 1225611, 1225732, 1225749, 1225840, 1225866, 1226226, 1226537, 1226552, 1226554, 1226557, 1226558, 1226562, 1226563, 1226575, 1226583, 1226585, 1226587, 1226595, 1226614, 1226619, 1226621, 1226624, 1226643, 1226644, 1226645, 1226647, 1226650, 1226669, 1226670, 1226672, 1226674, 1226679, 1226686, 1226691, 1226692, 1226698, 1226703, 1226708, 1226709, 1226711, 1226712, 1226713, 1226715, 1226716, 1226720, 1226721, 1226732, 1226762, 1226785, 1226786, 1226962
CVE References: CVE-2021-43389, CVE-2021-4439, CVE-2021-47247, CVE-2021-47311, CVE-2021-47328, CVE-2021-47368, CVE-2021-47372, CVE-2021-47379, CVE-2021-47571, CVE-2021-47576, CVE-2021-47583, CVE-2021-47589, CVE-2021-47595, CVE-2021-47596, CVE-2021-47600, CVE-2021-47602, CVE-2021-47609, CVE-2021-47611, CVE-2021-47612, CVE-2021-47617, CVE-2021-47618, CVE-2021-47619, CVE-2021-47620, CVE-2022-2938, CVE-2022-48711, CVE-2022-48715, CVE-2022-48717, CVE-2022-48722, CVE-2022-48724, CVE-2022-48726, CVE-2022-48728, CVE-2022-48730, CVE-2022-48732, CVE-2022-48736, CVE-2022-48737, CVE-2022-48738, CVE-2022-48746, CVE-2022-48747, CVE-2022-48748, CVE-2022-48749, CVE-2022-48752, CVE-2022-48754, CVE-2022-48756, CVE-2022-48758, CVE-2022-48759, CVE-2022-48760, CVE-2022-48767, CVE-2022-48768, CVE-2022-48771, CVE-2023-24023, CVE-2023-52707, CVE-2023-52752, CVE-2023-52881, CVE-2024-26822, CVE-2024-35789, CVE-2024-35861, CVE-2024-35862, CVE-2024-35864, CVE-2024-35878, CVE-2024-35950, CVE-2024-36894, CVE-2024-36904, CVE-2024-36940, CVE-2024-36964, CVE-2024-38541, CVE-2024-38545, CVE-2024-38559, CVE-2024-38560
Maintenance Incident: [SUSE:Maintenance:34695](https://smelt.suse.de/incident/34695/)
Sources used:
SUSE Linux Enterprise Micro 5.1 (src):
 kernel-source-rt-5.3.18-150300.175.1
SUSE Linux Enterprise Micro 5.2 (src):
 kernel-source-rt-5.3.18-150300.175.1
SUSE Linux Enterprise Micro for Rancher 5.2 (src):
 kernel-source-rt-5.3.18-150300.175.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.