mrp: introduce active flags to prevent UAF when applicant uninit
In the Linux kernel, the following vulnerability has been resolved: mrp: introduce active flags to prevent UAF when applicant uninit The caller of del_timer_sync must prevent restarting of the timer, If we have no this synchronization, there is a small probability that the cancellation will not be successful. And syzbot report the fellowing crash: ================================================================== BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:929 [inline] BUG: KASAN: use-after-free in enqueue_timer+0x18/0xa4 kernel/time/timer.c:605 Write at addr f9ff000024df6058 by task syz-fuzzer/2256 Pointer tag: [f9], memory tag: [fe] CPU: 1 PID: 2256 Comm: syz-fuzzer Not tainted 6.1.0-rc5-syzkaller-00008- ge01d50cbd6ee #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace.part.0+0xe0/0xf0 arch/arm64/kernel/stacktrace.c:156 dump_backtrace arch/arm64/kernel/stacktrace.c:162 [inline] show_stack+0x18/0x40 arch/arm64/kernel/stacktrace.c:163 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x68/0x84 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x1a8/0x4a0 mm/kasan/report.c:395 kasan_report+0x94/0xb4 mm/kasan/report.c:495 __do_kernel_fault+0x164/0x1e0 arch/arm64/mm/fault.c:320 do_bad_area arch/arm64/mm/fault.c:473 [inline] do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:749 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:825 el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:367 el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:427 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576 hlist_add_head include/linux/list.h:929 [inline] enqueue_timer+0x18/0xa4 kernel/time/timer.c:605 mod_timer+0x14/0x20 kernel/time/timer.c:1161 mrp_periodic_timer_arm net/802/mrp.c:614 [inline] mrp_periodic_timer+0xa0/0xc0 net/802/mrp.c:627 call_timer_fn.constprop.0+0x24/0x80 kernel/time/timer.c:1474 expire_timers+0x98/0xc4 kernel/time/timer.c:1519 To fix it, we can introduce a new active flags to make sure the timer will not restart.
- BDU:2026-05121
- SUSE-SU-2026:0473-1
- SUSE-SU-2026:0474-1
- SUSE-SU-2026:0475-1
- SUSE-SU-2026:0495-1
- SUSE-SU-2026:0496-1
- SUSE-SU-2026:0953-1
- SUSE-SU-2026:0954-1
- SUSE-SU-2026:0958-1
- SUSE-SU-2026:0964-1
- SUSE-SU-2026:0967-1
- SUSE-SU-2026:0970-1
- SUSE-SU-2026:0983-1
- SUSE-SU-2026:0992-1
- SUSE-SU-2026:0997-1
- SUSE-SU-2026:1000-1
- SUSE-SU-2026:1002-1
- SUSE-SU-2026:1039-1
- SUSE-SU-2026:1044-1
- SUSE-SU-2026:1046-1
- Published
- Dec 24, 2025
- Updated
- Aug 5, 2026
- EPSS
- 0.2% · 4th percentile
- CWE
- —
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.8
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
—
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
- 3.9affected
- febf018d22347b5df94066bca05d0c11a84e839d and later · before 98f53e591940e4c3818be358c5dc684d5b30cb56affected · git
- febf018d22347b5df94066bca05d0c11a84e839d and later · before aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9affected · git
- febf018d22347b5df94066bca05d0c11a84e839d and later · before 78d48bc41f7726113c9f114268d3ab11212814daaffected · git
- febf018d22347b5df94066bca05d0c11a84e839d and later · before aadb1507a77b060c529edfeaf67f803e31461f24affected · git
- febf018d22347b5df94066bca05d0c11a84e839d and later · before 755eb0879224ffc2a43de724554aeaf0e51e5a64affected · git
- febf018d22347b5df94066bca05d0c11a84e839d and later · before 5d5a481a7fd0234f617535dc464ea010804a1129affected · git
- febf018d22347b5df94066bca05d0c11a84e839d and later · before 1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6affected · git
- febf018d22347b5df94066bca05d0c11a84e839d and later · before 563e45fd5046045cc194af3ba17f5423e1c98170affected · git
- febf018d22347b5df94066bca05d0c11a84e839d and later · before ab0377803dafc58f1e22296708c1c28e309414d6affected · git
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 6.1.4-1 | 6.1.4-1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-64kb | before 5.14.21-150500.55.136.1 | 5.14.21-150500.55.136.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-docs | before 5.14.21-150500.55.136.1 | 5.14.21-150500.55.136.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-obs-build | before 5.14.21-150500.55.136.1 | 5.14.21-150500.55.136.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-syms | before 5.14.21-150500.55.136.1 | 5.14.21-150500.55.136.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kernel-default | before 4.12.14-122.293.1 | 4.12.14-122.293.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_65 | before 15-2.1 | 15-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_67 | before 14-2.1 | 14-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_68 | before 12-2.1 | 12-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_70 | before 11-2.1 | 11-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_72 | before 7-2.1 | 7-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_73 | before 5-2.1 | 5-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_75 | before 3-2.1 | 3-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_76 | before 3-2.1 | 3-2.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_77 | before 1-8.3.1 | 1-8.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_36 | before 16-150400.2.2 | 16-150400.2.2 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_37 | before 16-150400.2.2 | 16-150400.2.2 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_44 | before 9-150400.2.1 | 9-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_45 | before 7-150400.2.1 | 7-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_47 | before 3-150400.2.1 | 3-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_24 | before 16-150500.2.2 | 16-150500.2.2 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_25 | before 15-150500.2.2 | 15-150500.2.2 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_27 | before 14-150500.2.1 | 14-150500.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_29 | before 11-150500.2.1 | 11-150500.2.1 |
+15
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
- CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler40Plan
- CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index40Plan
- CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index40Plan
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 | 1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6 | Vendor (CNA) |
| Linux Linux | 563e45fd5046045cc194af3ba17f5423e1c98170 | Vendor (CNA) |
| Linux Linux | 5d5a481a7fd0234f617535dc464ea010804a1129 | Vendor (CNA) |
| Linux Linux | 755eb0879224ffc2a43de724554aeaf0e51e5a64 | Vendor (CNA) |
| Linux Linux | 78d48bc41f7726113c9f114268d3ab11212814da | Vendor (CNA) |
| Linux Linux | 98f53e591940e4c3818be358c5dc684d5b30cb56 | Vendor (CNA) |
| Linux Linux | aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9 | Vendor (CNA) |
| Linux Linux | aadb1507a77b060c529edfeaf67f803e31461f24 | Vendor (CNA) |
| Linux Linux | ab0377803dafc58f1e22296708c1c28e309414d6 | Vendor (CNA) |
| debian:linux | 6.1.4-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-64kb | 5.14.21-150500.55.136.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | Package registry (OSV) |
| suse:kernel-default | 4.12.14-122.293.1 · SUSE:Linux Enterprise Live Patching 12 SP5 | Package registry (OSV) |
| suse:kernel-default-base | 5.14.21-150500.55.136.1.150500.6.67.1 · SUSE:Linux Enterprise Micro 5.5 | Package registry (OSV) |
| suse:kernel-docs | 5.14.21-150500.55.136.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP5_Update_35 | 1-150500.11.3.1 · SUSE:Linux Enterprise Live Patching 15 SP5 | Package registry (OSV) |
| suse:kernel-obs-build | 5.14.21-150500.55.136.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | Package registry (OSV) |
| suse:kernel-rt | 5.3.18-150300.235.1 · SUSE:Linux Enterprise Micro 5.2 | Package registry (OSV) |
| suse:kernel-source | 4.12.14-122.293.1 · SUSE:Linux Enterprise Server 12 SP5-LTSS | Package registry (OSV) |
| suse:kernel-source-rt | 5.3.18-150300.235.1 · SUSE:Linux Enterprise Micro 5.2 | Package registry (OSV) |
| suse:kernel-syms | 4.12.14-122.293.1 · SUSE:Linux Enterprise Server 12 SP5-LTSS | Package registry (OSV) |
| suse:kernel-zfcpdump | 5.14.21-150500.55.136.1 · SUSE:Linux Enterprise Server 15 SP5-LTSS | Package registry (OSV) |
| suse:kgraft-patch-SLE12-SP5_Update_77 | 1-8.3.1 · SUSE:Linux Enterprise Live Patching 12 SP5 | 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.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
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 researchersFinders, 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)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6
- git.kernel.org/stable/c/563e45fd5046045cc194af3ba17f5423e1c98170
- git.kernel.org/stable/c/5d5a481a7fd0234f617535dc464ea010804a1129
- git.kernel.org/stable/c/755eb0879224ffc2a43de724554aeaf0e51e5a64
- git.kernel.org/stable/c/78d48bc41f7726113c9f114268d3ab11212814da
- git.kernel.org/stable/c/98f53e591940e4c3818be358c5dc684d5b30cb56
- git.kernel.org/stable/c/aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9
- git.kernel.org/stable/c/aadb1507a77b060c529edfeaf67f803e31461f24
- git.kernel.org/stable/c/ab0377803dafc58f1e22296708c1c28e309414d6
Vendor advisories and official records. Exploit/PoC links are deliberately left out.