CVE-2021-46939
published 2024-02-27CVE-2021-46939: In the Linux kernel, the following vulnerability has been resolved: tracing: Restructure trace_clock_global() to never block It was reported that a fix to the…
PriorityP420medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.25%
16.0th percentile
In the Linux kernel, the following vulnerability has been resolved:
tracing: Restructure trace_clock_global() to never block
It was reported that a fix to the ring buffer recursion detection would
cause a hung machine when performing suspend / resume testing. The
following backtrace was extracted from debugging that case:
Call Trace:
trace_clock_global+0x91/0xa0
__rb_reserve_next+0x237/0x460
ring_buffer_lock_reserve+0x12a/0x3f0
trace_buffer_lock_reserve+0x10/0x50
__trace_graph_return+0x1f/0x80
trace_graph_return+0xb7/0xf0
? trace_clock_global+0x91/0xa0
ftrace_return_to_handler+0x8b/0xf0
? pv_hash+0xa0/0xa0
return_to_handler+0x15/0x30
? ftrace_graph_caller+0xa0/0xa0
? trace_clock_global+0x91/0xa0
? __rb_reserve_next+0x237/0x460
? ring_buffer_lock_reserve+0x12a/0x3f0
? trace_event_buffer_lock_reserve+0x3c/0x120
? trace_event_buffer_reserve+0x6b/0xc0
? trace_event_raw_event_device_pm_callback_start+0x125/0x2d0
? dpm_run_callback+0x3b/0xc0
? pm_ops_is_empty+0x50/0x50
? platform_get_irq_byname_optional+0x90/0x90
? trace_device_pm_callback_start+0x82/0xd0
? dpm_run_callback+0x49/0xc0
With the following RIP:
RIP: 0010:native_queued_spin_lock_slowpath+0x69/0x200
Since the fix to the recursion detection would allow a single recursion to
happen while tracing, this lead to the trace_clock_global() taking a spin
lock and then trying to take it again:
ring_buffer_lock_reserve() {
trace_clock_global() {
arch_spin_lock() {
queued_spin_lock_slowpath() {
/* lock taken */
(something else gets traced by function graph tracer)
ring_buffer_lock_reserve() {
trace_clock_global() {
arch_spin_lock() {
queued_spin_lock_slowpath() {
/* DEAD LOCK! */
Tracing should *never* block, as it can lead to strange lockups like the
above.
Restructure the trace_clock_global() code to instead of simply taking a
lock to update the recorded "prev_time" simply use it, as two events
happening on two different CPUs that calls this at the same time, really
doesn't matter which one goes first. Use a try
Affected
24 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.10.38-1 (bookworm) | linux 5.10.38-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 14131f2f98ac350ee9e73faed916d2238a8b6a0d < 91ca6f6a91f679c8645d7f3307e03ce86ad518c4 | 91ca6f6a91f679c8645d7f3307e03ce86ad518c4 |
| linux | linux | >= 14131f2f98ac350ee9e73faed916d2238a8b6a0d < 859b47a43f5a0e5b9a92b621dc6ceaad39fb5c8b | 859b47a43f5a0e5b9a92b621dc6ceaad39fb5c8b |
| linux | linux | >= 14131f2f98ac350ee9e73faed916d2238a8b6a0d < 1fca00920327be96f3318224f502e4d5460f9545 | 1fca00920327be96f3318224f502e4d5460f9545 |
| linux | linux | >= 14131f2f98ac350ee9e73faed916d2238a8b6a0d < d43d56dbf452ccecc1ec735cd4b6840118005d7c | d43d56dbf452ccecc1ec735cd4b6840118005d7c |
| linux | linux | >= 14131f2f98ac350ee9e73faed916d2238a8b6a0d < c64da3294a7d59a4bf6874c664c13be892f15f44 | c64da3294a7d59a4bf6874c664c13be892f15f44 |
| linux | linux | >= 14131f2f98ac350ee9e73faed916d2238a8b6a0d < a33614d52e97fc8077eb0b292189ca7d964cc534 | a33614d52e97fc8077eb0b292189ca7d964cc534 |
| linux | linux | >= 14131f2f98ac350ee9e73faed916d2238a8b6a0d < 6e2418576228eeb12e7ba82edb8f9500623942ff | 6e2418576228eeb12e7ba82edb8f9500623942ff |
| linux | linux | >= 14131f2f98ac350ee9e73faed916d2238a8b6a0d < 2a1bd74b8186d7938bf004f5603f25b84785f63e | 2a1bd74b8186d7938bf004f5603f25b84785f63e |
| linux | linux | >= 14131f2f98ac350ee9e73faed916d2238a8b6a0d < aafe104aa9096827a429bc1358f8260ee565b7cc | aafe104aa9096827a429bc1358f8260ee565b7cc |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 4.4.0-254.288 | 4.4.0-254.288 |
| linux | linux_kernel | >= 2.6.30 < 4.4.269 | 4.4.269 |
| linux | linux_kernel | >= 4.10.0 < 4.14.233 | 4.14.233 |
| linux | linux_kernel | >= 4.15.0 < 4.19.191 | 4.19.191 |
| linux | linux_kernel | >= 4.20.0 < 5.4.118 | 5.4.118 |
| linux | linux_kernel | >= 4.5.0 < 4.9.269 | 4.9.269 |
| linux | linux_kernel | >= 5.11.0 < 5.11.20 | 5.11.20 |
| linux | linux_kernel | >= 5.12.0 < 5.12.3 | 5.12.3 |
| linux | linux_kernel | >= 5.5.0 < 5.10.36 | 5.10.36 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
vendor_ubuntu5.5MEDIUM
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OSV
linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
osv·2024-05-16·CVSS 5.5
CVE-2023-47233 [MEDIUM] linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could possibly
use this to cause a denial of service (system crash). (CVE-2023-47233)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Ext4 file system;
- JFS file system;
- NILFS2 file system;
- Core kernel;
- Bluetooth subsystem;
- Networking core;
- IPv4 networking;
- Logical Link layer;
- MAC80211 subsystem;
- Netlink;
- NFC subsystem;
- Tomoyo security module;
(CVE-2023-52601, CVE-2024-266
GHSA
GHSA-8h6j-vxpr-4ff5: In the Linux kernel, the following vulnerability has been resolved:
tracing: Restructure trace_clock_global() to never block
It was reported that a
ghsa_unreviewed·2024-02-27
CVE-2021-46939 [MEDIUM] CWE-400 GHSA-8h6j-vxpr-4ff5: In the Linux kernel, the following vulnerability has been resolved:
tracing: Restructure trace_clock_global() to never block
It was reported that a
In the Linux kernel, the following vulnerability has been resolved:
tracing: Restructure trace_clock_global() to never block
It was reported that a fix to the ring buffer recursion detection would
cause a hung machine when performing suspend / resume testing. The
following backtrace was extracted from debugging that case:
Call Trace:
trace_clock_global+0x91/0xa0
__rb_reserve_next+0x237/0x460
ring_buffer_lock_reserve+0x12a/0x3f0
trace_buffer_lock_reserve+0x10/0x50
__trace_graph_return+0x1f/0x80
trace_graph_return+0xb7/0xf0
? trace_clock_global+0x91/0xa0
ftrace_return_to_handler+0x8b/0xf0
? pv_hash+0xa0/0xa0
return_to_handler+0x15/0x30
? ftrace_graph_caller+0xa0/0xa0
? trace_clock_global+0x91/0xa0
? __rb_reserve_next+0x237/0x460
? ring_buffer_lock_reserve+0x12a/0x3f0
? trace_event_buffer_
OSV
CVE-2021-46939: In the Linux kernel, the following vulnerability has been resolved: tracing: Restructure trace_clock_global() to never block It was reported that a fi
osv·2024-02-27·CVSS 5.5
CVE-2021-46939 [MEDIUM] CVE-2021-46939: In the Linux kernel, the following vulnerability has been resolved: tracing: Restructure trace_clock_global() to never block It was reported that a fi
In the Linux kernel, the following vulnerability has been resolved: tracing: Restructure trace_clock_global() to never block It was reported that a fix to the ring buffer recursion detection would cause a hung machine when performing suspend / resume testing. The following backtrace was extracted from debugging that case: Call Trace: trace_clock_global+0x91/0xa0 __rb_reserve_next+0x237/0x460 ring_buffer_lock_reserve+0x12a/0x3f0 trace_buffer_lock_reserve+0x10/0x50 __trace_graph_return+0x1f/0x80 trace_graph_return+0xb7/0xf0 ? trace_clock_global+0x91/0xa0 ftrace_return_to_handler+0x8b/0xf0 ? pv_hash+0xa0/0xa0 return_to_handler+0x15/0x30 ? ftrace_graph_caller+0xa0/0xa0 ? trace_clock_global+0x91/0xa0 ? __rb_reserve_next+0x237/0x460 ? ring_buffer_lock_reserve+0x12a/0x3f0 ? trace_event_buffer_loc
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2024-05-16·CVSS 5.5
CVE-2021-46939 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could possibly
use this to cause a denial of service (system crash). (CVE-2023-47233)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Ext4 file system;
- JFS file system;
- NILFS2 file system;
- Core kernel;
- Bluetooth subsystem;
- Networking core;
- IPv4 networking;
- Logical Link layer;
- MAC80211 subsystem;
- Netlink;
- NFC subsystem;
- Tomoyo securi
Red Hat
kernel: tracing: Restructure trace_clock_global() to never block
vendor_redhat·2024-02-27·CVSS 5.5
CVE-2021-46939 [MEDIUM] CWE-833 kernel: tracing: Restructure trace_clock_global() to never block
kernel: tracing: Restructure trace_clock_global() to never block
In the Linux kernel, the following vulnerability has been resolved:
tracing: Restructure trace_clock_global() to never block
It was reported that a fix to the ring buffer recursion detection would
cause a hung machine when performing suspend / resume testing. The
following backtrace was extracted from debugging that case:
Call Trace:
trace_clock_global+0x91/0xa0
__rb_reserve_next+0x237/0x460
ring_buffer_lock_reserve+0x12a/0x3f0
trace_buffer_lock_reserve+0x10/0x50
__trace_graph_return+0x1f/0x80
trace_graph_return+0xb7/0xf0
? trace_clock_global+0x91/0xa0
ftrace_return_to_handler+0x8b/0xf0
? pv_hash+0xa0/0xa0
return_to_handler+0x15/0x30
? ftrace_graph_caller+0xa0/0xa0
? trace_clock_global+0x91/0xa0
? __rb_reserve_next+0x237/0x4
Debian
CVE-2021-46939: linux - In the Linux kernel, the following vulnerability has been resolved: tracing: Re...
vendor_debian·2021·CVSS 5.5
CVE-2021-46939 [MEDIUM] CVE-2021-46939: linux - In the Linux kernel, the following vulnerability has been resolved: tracing: Re...
In the Linux kernel, the following vulnerability has been resolved: tracing: Restructure trace_clock_global() to never block It was reported that a fix to the ring buffer recursion detection would cause a hung machine when performing suspend / resume testing. The following backtrace was extracted from debugging that case: Call Trace: trace_clock_global+0x91/0xa0 __rb_reserve_next+0x237/0x460 ring_buffer_lock_reserve+0x12a/0x3f0 trace_buffer_lock_reserve+0x10/0x50 __trace_graph_return+0x1f/0x80 trace_graph_return+0xb7/0xf0 ? trace_clock_global+0x91/0xa0 ftrace_return_to_handler+0x8b/0xf0 ? pv_hash+0xa0/0xa0 return_to_handler+0x15/0x30 ? ftrace_graph_caller+0xa0/0xa0 ? trace_clock_global+0x91/0xa0 ? __rb_reserve_next+0x237/0x460 ? ring_buffer_lock_reserve+0x12a/0x3f0 ? trace_event_buffer_loc
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/1fca00920327be96f3318224f502e4d5460f9545https://git.kernel.org/stable/c/2a1bd74b8186d7938bf004f5603f25b84785f63ehttps://git.kernel.org/stable/c/6e2418576228eeb12e7ba82edb8f9500623942ffhttps://git.kernel.org/stable/c/859b47a43f5a0e5b9a92b621dc6ceaad39fb5c8bhttps://git.kernel.org/stable/c/91ca6f6a91f679c8645d7f3307e03ce86ad518c4https://git.kernel.org/stable/c/a33614d52e97fc8077eb0b292189ca7d964cc534https://git.kernel.org/stable/c/aafe104aa9096827a429bc1358f8260ee565b7cchttps://git.kernel.org/stable/c/c64da3294a7d59a4bf6874c664c13be892f15f44https://git.kernel.org/stable/c/d43d56dbf452ccecc1ec735cd4b6840118005d7chttps://git.kernel.org/stable/c/1fca00920327be96f3318224f502e4d5460f9545https://git.kernel.org/stable/c/2a1bd74b8186d7938bf004f5603f25b84785f63ehttps://git.kernel.org/stable/c/6e2418576228eeb12e7ba82edb8f9500623942ffhttps://git.kernel.org/stable/c/859b47a43f5a0e5b9a92b621dc6ceaad39fb5c8bhttps://git.kernel.org/stable/c/91ca6f6a91f679c8645d7f3307e03ce86ad518c4https://git.kernel.org/stable/c/a33614d52e97fc8077eb0b292189ca7d964cc534https://git.kernel.org/stable/c/aafe104aa9096827a429bc1358f8260ee565b7cchttps://git.kernel.org/stable/c/c64da3294a7d59a4bf6874c664c13be892f15f44https://git.kernel.org/stable/c/d43d56dbf452ccecc1ec735cd4b6840118005d7c
2024-02-27
Published