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NVD / CVE Program· CNA Linux

CVE-2023-53558: rcu-tasks: Avoid pr_info() with spin lock in cblist_init_generic()

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.14% (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 5fc8cbe4cf0fd34ded8045c385790c3bf04f6785, 9027d69221ff96e1356f070f7feb2ff989ae7388, ea9b81c7d9104040b46a84d2303045de267f5557.

Low priority for now. Upgrade to Linux Linux 5fc8cbe4cf0fd34ded8045c385790c3bf04f6785, 9027d69221ff96e1356f070f7feb2ff989ae7388, ea9b81c7d9104040b46a84d2303045de267f5557 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: rcu-tasks: Avoid pr_info() with spin lock in cblist_init_generic() pr_info() is called with rtp->cbs_gbl_lock spin lock locked. Because pr_info() calls printk() that might sleep, this will result in BUG like below: [ 0.206455] cblist_init_generic: Setting adjustable number of callback queues. [ 0.206463] [ 0.206464] ============================= [ 0.206464] [ BUG: Invalid wait context ] [ 0.206465] 5.19.0-00428-g9de1f9c8ca51 #5 Not tainted [ 0.206466] ----------------------------- [ 0.206466] swapper/0/1 is trying to lock: [ 0.206467] ffffffffa0167a58 (&port_lock_key){....}-{3:3}, at: serial8250_console_write+0x327/0x4a0 [ 0.206473] other info that might help us debug this: [ 0.206473] context-{5:5} [ 0.206474] 3 locks held by swapper/0/1: [ 0.206474] #0: ffffffff9eb597e0 (rcu_tasks.cbs_gbl_lock){....}-{2:2}, at: cblist_init_generic.constprop.0+0x14/0x1f0 [ 0.206478] #1: ffffffff9eb579c0 (console_lock){+.+.}-{0:0}, at: _printk+0x63/0x7e [ 0.206482] #2: ffffffff9ea77780 (console_owner){....}-{0:0}, at: console_emit_next_record.constprop.0+0x111/0x330 [ 0.206485] stack backtrace: [ 0.206486] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.19.0-00428-g9de1f9c8ca51 #5 [ 0.206488] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-1.fc36 04/01/2014 [ 0.206489] Call Trace: [ 0.206490] <TASK> [ 0.206491] dump_stack_lvl+0x6a/0x9f [ 0.206493] __lock_acquire.cold+0x2d7/0x2fe [ 0.206496] ? stack_trace_save+0x46/0x70 [ 0.206497] lock_acquire+0xd1/0x2f0 [ 0.206499] ? serial8250_console_write+0x327/0x4a0 [ 0.206500] ? __lock_acquire+0x5c7/0x2720 [ 0.206502] _raw_spin_lock_irqsave+0x3d/0x90 [ 0.206504] ? serial8250_console_write+0x327/0x4a0 [ 0.206506] serial8250_console_write+0x327/0x4a0 [ 0.206508] console_emit_next_record.constprop.0+0x180/0x330 [ 0.206511] console_unlock+0xf7/0x1f0 [ 0.206512] vprintk_emit+0xf7/0x330 [ 0.206514] _printk+0x63/0x7e [ 0.206516] cblist_init_generic.constprop.0.cold+0x24/0x32 [ 0.206518] rcu_init_tasks_generic+0x5/0xd9 [ 0.206522] kernel_init_freeable+0x15b/0x2a2 [ 0.206523] ? rest_init+0x160/0x160 [ 0.206526] kernel_init+0x11/0x120 [ 0.206527] ret_from_fork+0x1f/0x30 [ 0.206530] </TASK> [ 0.207018] cblist_init_generic: Setting shift to 1 and lim to 1. This patch moves pr_info() so that it is called without rtp->cbs_gbl_lock locked.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Oct 4, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 3th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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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.

VendorProduct
linuxlinux kernel

Affected versions

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

  • linux linux kernel5.17 and later · before 6.1.42
  • linux linux kernel6.2 and later · before 6.4.7

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

    • 5.17affected
    • ab97152f88a4d580b89f0b7cc3028ffac438216f and later · before 9027d69221ff96e1356f070f7feb2ff989ae7388affected · git
    • ab97152f88a4d580b89f0b7cc3028ffac438216f and later · before ea9b81c7d9104040b46a84d2303045de267f5557affected · git
    • ab97152f88a4d580b89f0b7cc3028ffac438216f and later · before 5fc8cbe4cf0fd34ded8045c385790c3bf04f6785affected · git
    • before 5.17not affected · semver
    • 6.1.42 and later · up to and including 6.1.*not affected · semver
    • 6.4.7 and later · up to and including 6.4.*not affected · semver
    • 6.5 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.52-16.1.52-1
Debian:13linuxbefore 6.4.11-16.4.11-1
openSUSE:Leap 15.6dtb-aarch64before 6.4.0-150600.23.78.16.4.0-150600.23.78.1
openSUSE:Leap 15.6kernel-64kbbefore 6.4.0-150600.23.78.16.4.0-150600.23.78.1
openSUSE:Leap 15.6kernel-azurebefore 6.4.0-150600.8.55.16.4.0-150600.8.55.1
openSUSE:Leap 15.6kernel-debugbefore 6.4.0-150600.23.78.16.4.0-150600.23.78.1
openSUSE:Leap 15.6kernel-defaultbefore 6.4.0-150600.23.78.16.4.0-150600.23.78.1
openSUSE:Leap 15.6kernel-default-basebefore 6.4.0-150600.23.78.1.150600.12.34.26.4.0-150600.23.78.1.150600.12.34.2
openSUSE:Leap 15.6kernel-docsbefore 6.4.0-150600.23.78.16.4.0-150600.23.78.1
openSUSE:Leap 15.6kernel-kvmsmallbefore 6.4.0-150600.23.78.16.4.0-150600.23.78.1
openSUSE:Leap 15.6kernel-obs-buildbefore 6.4.0-150600.23.78.16.4.0-150600.23.78.1
openSUSE:Leap 15.6kernel-obs-qabefore 6.4.0-150600.23.78.16.4.0-150600.23.78.1
openSUSE:Leap 15.6kernel-rtbefore 6.4.0-150600.10.58.16.4.0-150600.10.58.1
openSUSE:Leap 15.6kernel-rt_debugbefore 6.4.0-150600.10.58.16.4.0-150600.10.58.1
openSUSE:Leap 15.6kernel-sourcebefore 6.4.0-150600.23.78.16.4.0-150600.23.78.1
openSUSE:Leap 15.6kernel-source-azurebefore 6.4.0-150600.8.55.16.4.0-150600.8.55.1
openSUSE:Leap 15.6kernel-source-rtbefore 6.4.0-150600.10.58.16.4.0-150600.10.58.1
openSUSE:Leap 15.6kernel-symsbefore 6.4.0-150600.23.78.16.4.0-150600.23.78.1
openSUSE:Leap 15.6kernel-syms-azurebefore 6.4.0-150600.8.55.16.4.0-150600.8.55.1
openSUSE:Leap 15.6kernel-syms-rtbefore 6.4.0-150600.10.58.16.4.0-150600.10.58.1
openSUSE:Leap 15.6kernel-zfcpdumpbefore 6.4.0-150600.23.78.16.4.0-150600.23.78.1
Red Hat:rhel_eus:9.4::appstreambpftool-debuginfobefore 0:7.3.0-427.79.1.el9_40:7.3.0-427.79.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-64k-debug-debuginfobefore 0:5.14.0-427.79.1.el9_40:5.14.0-427.79.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-64k-debug-develbefore 0:5.14.0-427.79.1.el9_40:5.14.0-427.79.1.el9_4

+96

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-2023-53555Oct 4, 2025 · mm/damon/core: initialize damo_filter->list from damos_new_filter()
    22Monitor
  • ← EarlierCVE-2023-53556Oct 4, 2025 · iavf: Fix use-after-free in free_netdev
    31Monitor
  • Later →CVE-2023-53559Oct 4, 2025 · ip_vti: fix potential slab-use-after-free in decode_session6
    31Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
Linux Linux5fc8cbe4cf0fd34ded8045c385790c3bf04f6785Vendor (CNA)
Linux Linux9027d69221ff96e1356f070f7feb2ff989ae7388Vendor (CNA)
Linux Linuxea9b81c7d9104040b46a84d2303045de267f5557Vendor (CNA)
debian:linux6.1.52-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-azure6.4.0-150600.8.55.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.78.1.150600.12.34.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-build6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-qa6.4.0-150600.23.78.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source-azure6.4.0-150600.8.55.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms-azure6.4.0-150600.8.55.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:bpftool-debuginfo0:7.3.0-427.79.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-427.79.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-427.79.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-427.79.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-427.79.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-427.79.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-427.79.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-427.79.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-427.79.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-427.79.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-427.79.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-427.79.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
suse:kernel-64kb6.4.0-150600.23.78.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-azure6.4.0-150600.8.55.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6Package registry (OSV)

+13

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
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

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

  1. Fix✗ → ✓

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

References

Show all references (2 more)

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

All records