NVD / CVE Program· CNA Linux

CVE-2023-53560: tracing/histograms: Add histograms to hist_vars if they have referenced variables

Noroxi assessment

Priority: Monitor (action score 31/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.15% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 1576f0df7b4d1f82db588d6654b89d796fa06929, 4815359056083c555f97a5ee3af86519be5166de, 4a540f63618e525e433b37d2b5522cda08e321d7.

Low priority for now. Upgrade to Linux Linux 1576f0df7b4d1f82db588d6654b89d796fa06929, 4815359056083c555f97a5ee3af86519be5166de, 4a540f63618e525e433b37d2b5522cda08e321d7 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: tracing/histograms: Add histograms to hist_vars if they have referenced variables Hist triggers can have referenced variables without having direct variables fields. This can be the case if referenced variables are added for trigger actions. In this case the newly added references will not have field variables. Not taking such referenced variables into consideration can result in a bug where it would be possible to remove hist trigger with variables being refenced. This will result in a bug that is easily reproducable like so $ cd /sys/kernel/tracing $ echo 'synthetic_sys_enter char[] comm; long id' >> synthetic_events $ echo 'hist:keys=common_pid.execname,id.syscall:vals=hitcount:comm=common_pid.execname' >> events/raw_syscalls/sys_enter/trigger $ echo 'hist:keys=common_pid.execname,id.syscall:onmatch(raw_syscalls.sys_enter).synthetic_sys_enter($comm, id)' >> events/raw_syscalls/sys_enter/trigger $ echo '!hist:keys=common_pid.execname,id.syscall:vals=hitcount:comm=common_pid.execname' >> events/raw_syscalls/sys_enter/trigger [ 100.263533] ================================================================== [ 100.264634] BUG: KASAN: slab-use-after-free in resolve_var_refs+0xc7/0x180 [ 100.265520] Read of size 8 at addr ffff88810375d0f0 by task bash/439 [ 100.266320] [ 100.266533] CPU: 2 PID: 439 Comm: bash Not tainted 6.5.0-rc1 #4 [ 100.267277] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-20220807_005459-localhost 04/01/2014 [ 100.268561] Call Trace: [ 100.268902] <TASK> [ 100.269189] dump_stack_lvl+0x4c/0x70 [ 100.269680] print_report+0xc5/0x600 [ 100.270165] ? resolve_var_refs+0xc7/0x180 [ 100.270697] ? kasan_complete_mode_report_info+0x80/0x1f0 [ 100.271389] ? resolve_var_refs+0xc7/0x180 [ 100.271913] kasan_report+0xbd/0x100 [ 100.272380] ? resolve_var_refs+0xc7/0x180 [ 100.272920] __asan_load8+0x71/0xa0 [ 100.273377] resolve_var_refs+0xc7/0x180 [ 100.273888] event_hist_trigger+0x749/0x860 [ 100.274505] ? kasan_save_stack+0x2a/0x50 [ 100.275024] ? kasan_set_track+0x29/0x40 [ 100.275536] ? __pfx_event_hist_trigger+0x10/0x10 [ 100.276138] ? ksys_write+0xd1/0x170 [ 100.276607] ? do_syscall_64+0x3c/0x90 [ 100.277099] ? entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 100.277771] ? destroy_hist_data+0x446/0x470 [ 100.278324] ? event_hist_trigger_parse+0xa6c/0x3860 [ 100.278962] ? __pfx_event_hist_trigger_parse+0x10/0x10 [ 100.279627] ? __kasan_check_write+0x18/0x20 [ 100.280177] ? mutex_unlock+0x85/0xd0 [ 100.280660] ? __pfx_mutex_unlock+0x10/0x10 [ 100.281200] ? kfree+0x7b/0x120 [ 100.281619] ? ____kasan_slab_free+0x15d/0x1d0 [ 100.282197] ? event_trigger_write+0xac/0x100 [ 100.282764] ? __kasan_slab_free+0x16/0x20 [ 100.283293] ? __kmem_cache_free+0x153/0x2f0 [ 100.283844] ? sched_mm_cid_remote_clear+0xb1/0x250 [ 100.284550] ? __pfx_sched_mm_cid_remote_clear+0x10/0x10 [ 100.285221] ? event_trigger_write+0xbc/0x100 [ 100.285781] ? __kasan_check_read+0x15/0x20 [ 100.286321] ? __bitmap_weight+0x66/0xa0 [ 100.286833] ? _find_next_bit+0x46/0xe0 [ 100.287334] ? task_mm_cid_work+0x37f/0x450 [ 100.287872] event_triggers_call+0x84/0x150 [ 100.288408] trace_event_buffer_commit+0x339/0x430 [ 100.289073] ? ring_buffer_event_data+0x3f/0x60 [ 100.292189] trace_event_raw_event_sys_enter+0x8b/0xe0 [ 100.295434] syscall_trace_enter.constprop.0+0x18f/0x1b0 [ 100.298653] syscall_enter_from_user_mode+0x32/0x40 [ 100.301808] do_syscall_64+0x1a/0x90 [ 100.304748] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 100.307775] RIP: 0033:0x7f686c75c1cb [ 100.310617] Code: 73 01 c3 48 8b 0d 65 3c 10 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 21 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 35 3c 10 00 f7 d8 64 89 01 48 [ 100.317847] RSP: 002b:00007ffc60137a38 EFLAGS: 00000246 ORIG_RAX: 0000000000000021 [ 100.321200] RA ---truncated---

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: Oct 4, 2025
Updated: Oct 15, 2026
EPSS: 0.1% · 4th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 7.8
CNA · Linux: 7.8; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel4.17 and later · before 4.19.291
linux linux kernel4.20 and later · before 5.4.251
linux linux kernel5.5 and later · before 5.10.188
linux linux kernel5.11 and later · before 5.15.121
linux linux kernel5.16 and later · before 6.1.40
linux linux kernel6.2 and later · before 6.4.5
linux linux kernel6.5

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 4.17affected
- 067fe038e70f6e64960d26a79c4df5f1413d0f13 and later · before 4ffad1528e81c91769d9da1f8436080861c8ec67affected · git
- 067fe038e70f6e64960d26a79c4df5f1413d0f13 and later · before 4815359056083c555f97a5ee3af86519be5166deaffected · git
- 067fe038e70f6e64960d26a79c4df5f1413d0f13 and later · before 1576f0df7b4d1f82db588d6654b89d796fa06929affected · git
- 067fe038e70f6e64960d26a79c4df5f1413d0f13 and later · before 97f54b330c797ed27fba8791baeaa38ace886cbdaffected · git
- 067fe038e70f6e64960d26a79c4df5f1413d0f13 and later · before 5fd32eb6fa0ac795aa5a64bc004ab68d7b44196aaffected · git
- 067fe038e70f6e64960d26a79c4df5f1413d0f13 and later · before 4a540f63618e525e433b37d2b5522cda08e321d7affected · git
- 067fe038e70f6e64960d26a79c4df5f1413d0f13 and later · before 6018b585e8c6fa7d85d4b38d9ce49a5b67be7078affected · git
- before 4.17not affected · semver
- 4.19.291 and later · up to and including 4.19.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.52-1	6.1.52-1
Debian:13	linux	before 6.4.11-1	6.4.11-1
openSUSE:Leap 15.6	dtb-aarch64	before 6.4.0-150600.23.78.1	6.4.0-150600.23.78.1
openSUSE:Leap 15.6	kernel-64kb	before 6.4.0-150600.23.78.1	6.4.0-150600.23.78.1
openSUSE:Leap 15.6	kernel-azure	before 6.4.0-150600.8.55.1	6.4.0-150600.8.55.1
openSUSE:Leap 15.6	kernel-debug	before 6.4.0-150600.23.78.1	6.4.0-150600.23.78.1
openSUSE:Leap 15.6	kernel-default	before 6.4.0-150600.23.78.1	6.4.0-150600.23.78.1
openSUSE:Leap 15.6	kernel-default-base	before 6.4.0-150600.23.78.1.150600.12.34.2	6.4.0-150600.23.78.1.150600.12.34.2
openSUSE:Leap 15.6	kernel-docs	before 6.4.0-150600.23.78.1	6.4.0-150600.23.78.1
openSUSE:Leap 15.6	kernel-kvmsmall	before 6.4.0-150600.23.78.1	6.4.0-150600.23.78.1
openSUSE:Leap 15.6	kernel-obs-build	before 6.4.0-150600.23.78.1	6.4.0-150600.23.78.1
openSUSE:Leap 15.6	kernel-obs-qa	before 6.4.0-150600.23.78.1	6.4.0-150600.23.78.1
openSUSE:Leap 15.6	kernel-rt	before 6.4.0-150600.10.58.1	6.4.0-150600.10.58.1
openSUSE:Leap 15.6	kernel-rt_debug	before 6.4.0-150600.10.58.1	6.4.0-150600.10.58.1
openSUSE:Leap 15.6	kernel-source	before 6.4.0-150600.23.78.1	6.4.0-150600.23.78.1
openSUSE:Leap 15.6	kernel-source-azure	before 6.4.0-150600.8.55.1	6.4.0-150600.8.55.1
openSUSE:Leap 15.6	kernel-source-rt	before 6.4.0-150600.10.58.1	6.4.0-150600.10.58.1
openSUSE:Leap 15.6	kernel-syms	before 6.4.0-150600.23.78.1	6.4.0-150600.23.78.1
openSUSE:Leap 15.6	kernel-syms-azure	before 6.4.0-150600.8.55.1	6.4.0-150600.8.55.1
openSUSE:Leap 15.6	kernel-syms-rt	before 6.4.0-150600.10.58.1	6.4.0-150600.10.58.1
openSUSE:Leap 15.6	kernel-zfcpdump	before 6.4.0-150600.23.78.1	6.4.0-150600.23.78.1
SUSE:Linux Enterprise Live Patching 15 SP6	kernel-livepatch-SLE15-SP6_Update_17	before 1-150600.13.5.1	1-150600.13.5.1
SUSE:Linux Enterprise Live Patching 15 SP6	kernel-livepatch-SLE15-SP6-RT_Update_17	before 1-150600.1.3.1	1-150600.1.3.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6	kernel-64kb	before 6.4.0-150600.23.78.1	6.4.0-150600.23.78.1

+20

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2023-53549Oct 4, 2025 · netfilter: ipset: Rework long task execution when adding/deleting entries
22Monitor
← EarlierCVE-2023-53557Oct 4, 2025 · fprobe: Release rethook after the ftrace_ops is unregistered
22Monitor
Later →CVE-2023-53561Oct 4, 2025 · net: wwan: iosm: fix NULL pointer dereference when removing device
22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	1576f0df7b4d1f82db588d6654b89d796fa06929	Vendor (CNA)
Linux Linux	4815359056083c555f97a5ee3af86519be5166de	Vendor (CNA)
Linux Linux	4a540f63618e525e433b37d2b5522cda08e321d7	Vendor (CNA)
Linux Linux	4ffad1528e81c91769d9da1f8436080861c8ec67	Vendor (CNA)
Linux Linux	5fd32eb6fa0ac795aa5a64bc004ab68d7b44196a	Vendor (CNA)
Linux Linux	6018b585e8c6fa7d85d4b38d9ce49a5b67be7078	Vendor (CNA)
Linux Linux	97f54b330c797ed27fba8791baeaa38ace886cbd	Vendor (CNA)
debian:linux	6.1.52-1 · Debian:12	Package registry (OSV)
opensuse:dtb-aarch64	6.4.0-150600.23.78.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:kernel-64kb	6.4.0-150600.23.78.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:kernel-azure	6.4.0-150600.8.55.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:kernel-debug	6.4.0-150600.23.78.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:kernel-default	6.4.0-150600.23.78.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:kernel-default-base	6.4.0-150600.23.78.1.150600.12.34.2 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:kernel-docs	6.4.0-150600.23.78.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:kernel-kvmsmall	6.4.0-150600.23.78.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:kernel-obs-build	6.4.0-150600.23.78.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:kernel-obs-qa	6.4.0-150600.23.78.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:kernel-source-azure	6.4.0-150600.8.55.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:kernel-syms-azure	6.4.0-150600.8.55.1 · openSUSE:Leap 15.6	Package registry (OSV)
suse:kernel-64kb	6.4.0-150600.23.78.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6	Package registry (OSV)
suse:kernel-azure	6.4.0-150600.8.55.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6	Package registry (OSV)
suse:kernel-default	6.4.0-150600.23.78.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6	Package registry (OSV)
suse:kernel-default	6.4.0-36.1 · SUSE:Linux Micro 6.0	Package registry (OSV)
suse:kernel-default-base	6.4.0-150600.23.78.1.150600.12.34.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP6	Package registry (OSV)
suse:kernel-default-base	6.4.0-36.1.21.13 · SUSE:Linux Micro 6.0	Package registry (OSV)
suse:kernel-docs	6.4.0-150600.23.78.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6	Package registry (OSV)
suse:kernel-kvmsmall	6.4.0-36.1 · SUSE:Linux Micro 6.0	Package registry (OSV)
suse:kernel-rt	6.4.0-38.1 · SUSE:Linux Micro 6.0	Package registry (OSV)
suse:kernel-source	6.4.0-150600.23.78.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

SSVC exploitation— → noneOct 15, 2026, 11:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:09 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/1576f0df7b4d1f82db588d6654b89d796fa06929

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records