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NVD / CVE Program· CNA Linux

CVE-2026-43416: powerpc, perf: Check that current->mm is alive before getting user callchain

MediumCVSS 5.5 · v3.1—No exploit Fix available

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: 0.12% (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 7e5f60b8cfc02a2b23a40a5f5fd2fa81d010e737, 98074e16742ae87fb82e234b419783c5ffc9baea, e9bbfb4bfa86c6b5515b868d6982ac60505d7e39.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 7e5f60b8cfc02a2b23a40a5f5fd2fa81d010e737, 98074e16742ae87fb82e234b419783c5ffc9baea, e9bbfb4bfa86c6b5515b868d6982ac60505d7e39 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: powerpc, perf: Check that current->mm is alive before getting user callchain It may happen that mm is already released, which leads to kernel panic. This adds the NULL check for current->mm, similarly to commit 20afc60f892d ("x86, perf: Check that current->mm is alive before getting user callchain"). I was getting this panic when running a profiling BPF program (profile.py from bcc-tools): [26215.051935] Kernel attempted to read user page (588) - exploit attempt? (uid: 0) [26215.051950] BUG: Kernel NULL pointer dereference on read at 0x00000588 [26215.051952] Faulting instruction address: 0xc00000000020fac0 [26215.051957] Oops: Kernel access of bad area, sig: 11 [#1] [...] [26215.052049] Call Trace: [26215.052050] [c000000061da6d30] [c00000000020fc10] perf_callchain_user_64+0x2d0/0x490 (unreliable) [26215.052054] [c000000061da6dc0] [c00000000020f92c] perf_callchain_user+0x1c/0x30 [26215.052057] [c000000061da6de0] [c0000000005ab2a0] get_perf_callchain+0x100/0x360 [26215.052063] [c000000061da6e70] [c000000000573bc8] bpf_get_stackid+0x88/0xf0 [26215.052067] [c000000061da6ea0] [c008000000042258] bpf_prog_16d4ab9ab662f669_do_perf_event+0xf8/0x274 [...] In addition, move storing the top-level stack entry to generic perf_callchain_user to make sure the top-evel entry is always captured, even if current->mm is NULL. [Maddy: fixed message to avoid checkpatch format style error]

Published
May 8, 2026
Updated
Nov 11, 2026
EPSS
0.1% · 1th percentile

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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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

If any of these changes, we'll tell you in the daily email digest.

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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

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

    • 2.6.32affected
    • 20002ded4d937ca87aca6253b874920a96a763c4 and later · before 98074e16742ae87fb82e234b419783c5ffc9baeaaffected · git
    • 20002ded4d937ca87aca6253b874920a96a763c4 and later · before 7e5f60b8cfc02a2b23a40a5f5fd2fa81d010e737affected · git
    • 20002ded4d937ca87aca6253b874920a96a763c4 and later · before e9bbfb4bfa86c6b5515b868d6982ac60505d7e39affected · git
    • before 2.6.32not affected · semver
    • 6.18.19 and later · up to and including 6.18.*not affected · semver
    • 6.19.9 and later · up to and including 6.19.*not affected · semver
    • 7.0 and laternot affected · original_commit_for_fix

Affected versions

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

  • linux linux kernel2.6.32 and later · before 6.18.19
  • linux linux kernel6.19 and later · before 6.19.9
  • linux linux kernel7.0

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:14linuxbefore 6.19.10-16.19.10-1
openSUSE:Leap 16.0dtb-aarch64before 6.12.0-160000.38.16.12.0-160000.38.1
openSUSE:Leap 16.0kernel-64kbbefore 6.12.0-160000.38.16.12.0-160000.38.1
openSUSE:Leap 16.0kernel-azurebefore 6.12.0-160000.38.16.12.0-160000.38.1
openSUSE:Leap 16.0kernel-defaultbefore 6.12.0-160000.38.16.12.0-160000.38.1
openSUSE:Leap 16.0kernel-default-basebefore 6.12.0-160000.38.1.160000.2.226.12.0-160000.38.1.160000.2.22
openSUSE:Leap 16.0kernel-docsbefore 6.12.0-160000.38.16.12.0-160000.38.1
openSUSE:Leap 16.0kernel-kvmsmallbefore 6.12.0-160000.38.16.12.0-160000.38.1
openSUSE:Leap 16.0kernel-obs-buildbefore 6.12.0-160000.38.16.12.0-160000.38.1
openSUSE:Leap 16.0kernel-obs-qabefore 6.12.0-160000.38.16.12.0-160000.38.1
openSUSE:Leap 16.0kernel-rtbefore 6.12.0-160000.38.16.12.0-160000.38.1
openSUSE:Leap 16.0kernel-sourcebefore 6.12.0-160000.38.16.12.0-160000.38.1
openSUSE:Leap 16.0kernel-symsbefore 6.12.0-160000.38.16.12.0-160000.38.1
openSUSE:Leap 16.0kernel-zfcpdumpbefore 6.12.0-160000.38.16.12.0-160000.38.1
SUSE:Linux Enterprise Live Patching 12 SP5kernel-defaultbefore 4.12.14-122.328.14.12.14-122.328.1
SUSE:Linux Enterprise Live Patching 12 SP5kgraft-patch-SLE12-SP5_Update_87before 1-8.5.11-8.5.1
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-sourcebefore 4.12.14-122.328.14.12.14-122.328.1
SUSE:Linux Enterprise Server 12 SP5-LTSSkernel-symsbefore 4.12.14-122.328.14.12.14-122.328.1
SUSE:Linux Enterprise Server 16.0kernel-azurebefore 6.12.0-160000.38.16.12.0-160000.38.1
SUSE:Linux Enterprise Server 16.0kernel-docsbefore 6.12.0-160000.38.16.12.0-160000.38.1
SUSE:Linux Enterprise Server 16.0kernel-kvmsmallbefore 6.12.0-160000.38.16.12.0-160000.38.1
SUSE:Linux Enterprise Server 16.0kernel-obs-qabefore 6.12.0-160000.38.16.12.0-160000.38.1
SUSE:Linux Enterprise Server 16.0kernel-zfcpdumpbefore 6.12.0-160000.38.16.12.0-160000.38.1

+7

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-2026-43414May 8, 2026 · scsi: qla2xxx: Completely fix fcport double free
    39Monitor
  • ← EarlierCVE-2026-43415May 8, 2026 · scsi: ufs: core: Fix SError in ufshcd_rtc_work() during UFS suspend
    18Monitor
  • Later →CVE-2026-43417May 8, 2026 · sched/mmcid: Handle vfork()/CLONE_VM correctly
    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 / packageFixed versionSource
Linux Linux7e5f60b8cfc02a2b23a40a5f5fd2fa81d010e737Vendor (CNA)
Linux Linux98074e16742ae87fb82e234b419783c5ffc9baeaVendor (CNA)
Linux Linuxe9bbfb4bfa86c6b5515b868d6982ac60505d7e39Vendor (CNA)
debian:linux6.19.10-1 · Debian:14Package registry (OSV)
opensuse:dtb-aarch646.12.0-160000.38.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-64kb6.12.0-160000.38.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-azure6.12.0-160000.38.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default6.12.0-160000.38.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default-base6.12.0-160000.38.1.160000.2.22 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-docs6.12.0-160000.38.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-kvmsmall6.12.0-160000.38.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-build6.12.0-160000.38.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-qa6.12.0-160000.38.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-rt6.12.0-160000.38.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-source6.12.0-160000.38.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-syms6.12.0-160000.38.1 · openSUSE:Leap 16.0Package registry (OSV)
suse:kernel-64kb6.12.0-160000.38.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-azure6.12.0-160000.38.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-default4.12.14-122.328.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)
suse:kernel-default6.12.0-160000.38.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-default-base6.12.0-160000.38.1.160000.2.23 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-docs6.12.0-160000.38.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-kvmsmall6.12.0-160000.38.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-obs-build6.12.0-160000.38.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-obs-qa6.12.0-160000.38.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-rt6.12.0-160000.38.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-source4.12.14-122.328.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-source6.12.0-160000.38.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-syms4.12.14-122.328.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-syms6.12.0-160000.38.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)

+2

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.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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)

CWE-476 · NULL Pointer Dereference

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.

References

Show all references (2 more)

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

All records