CVE-2026-31419: net: bonding: fix use-after-free in bond_xmit_broadcast()
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: 0.12% (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 00752893f96b344f258c9c6de18b33171ac4872c, 060d83bb6147c36fc21134d5b332d266b8c176bc, 2884bf72fb8f03409e423397319205de48adca16.
Low priority for now. Upgrade to Linux Linux 00752893f96b344f258c9c6de18b33171ac4872c, 060d83bb6147c36fc21134d5b332d266b8c176bc, 2884bf72fb8f03409e423397319205de48adca16 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: net: bonding: fix use-after-free in bond_xmit_broadcast() bond_xmit_broadcast() reuses the original skb for the last slave (determined by bond_is_last_slave()) and clones it for others. Concurrent slave enslave/release can mutate the slave list during RCU-protected iteration, changing which slave is "last" mid-loop. This causes the original skb to be double-consumed (double-freed). Replace the racy bond_is_last_slave() check with a simple index comparison (i + 1 == slaves_count) against the pre-snapshot slave count taken via READ_ONCE() before the loop. This preserves the zero-copy optimization for the last slave while making the "last" determination stable against concurrent list mutations. The UAF can trigger the following crash: ================================================================== BUG: KASAN: slab-use-after-free in skb_clone Read of size 8 at addr ffff888100ef8d40 by task exploit/147 CPU: 1 UID: 0 PID: 147 Comm: exploit Not tainted 7.0.0-rc3+ #4 PREEMPTLAZY Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:123) print_report (mm/kasan/report.c:379 mm/kasan/report.c:482) kasan_report (mm/kasan/report.c:597) skb_clone (include/linux/skbuff.h:1724 include/linux/skbuff.h:1792 include/linux/skbuff.h:3396 net/core/skbuff.c:2108) bond_xmit_broadcast (drivers/net/bonding/bond_main.c:5334) bond_start_xmit (drivers/net/bonding/bond_main.c:5567 drivers/net/bonding/bond_main.c:5593) dev_hard_start_xmit (include/linux/netdevice.h:5325 include/linux/netdevice.h:5334 net/core/dev.c:3871 net/core/dev.c:3887) __dev_queue_xmit (include/linux/netdevice.h:3601 net/core/dev.c:4838) ip6_finish_output2 (include/net/neighbour.h:540 include/net/neighbour.h:554 net/ipv6/ip6_output.c:136) ip6_finish_output (net/ipv6/ip6_output.c:208 net/ipv6/ip6_output.c:219) ip6_output (net/ipv6/ip6_output.c:250) ip6_send_skb (net/ipv6/ip6_output.c:1985) udp_v6_send_skb (net/ipv6/udp.c:1442) udpv6_sendmsg (net/ipv6/udp.c:1733) __sys_sendto (net/socket.c:730 net/socket.c:742 net/socket.c:2206) __x64_sys_sendto (net/socket.c:2209) do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) </TASK> Allocated by task 147: Freed by task 147: The buggy address belongs to the object at ffff888100ef8c80 which belongs to the cache skbuff_head_cache of size 224 The buggy address is located 192 bytes inside of freed 224-byte region [ffff888100ef8c80, ffff888100ef8d60) Memory state around the buggy address: ffff888100ef8c00: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff888100ef8c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888100ef8d00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888100ef8d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff888100ef8e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
- BDU:2026-09718
- ALSA-2026:13566
- ALSA-2026:25191
- ALSA-2026:25217
- ALSA-2026:27353
- ALSA-2026:27354
- RHSA-2026:13566
- RHSA-2026:19521
- RHSA-2026:21209
- RHSA-2026:22334
- RHSA-2026:22900
- RHSA-2026:22940
- RHSA-2026:23224
- RHSA-2026:25191
- RHSA-2026:25217
- RHSA-2026:27353
- RHSA-2026:27354
- RHSA-2026:35870
- RHSA-2026:36172
- RHSA-2026:36530
- Published
- Apr 13, 2026
- Updated
- Oct 30, 2026
- EPSS
- 0.1% · 2th percentile
- CWE
- CWE-416
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 · 0.1%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
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.
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.
We use this product, ask for helpAffected 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 kernel5.10.94 and later · before 5.11
- linux linux kernel5.15.17 and later · before 5.16
- linux linux kernel5.16.3 and later · before 5.17
- linux linux kernel5.17 and later · before 6.12.86
- linux linux kernel6.13 and later · before 6.18.22
- linux linux kernel6.19 and later · before 6.19.12
- linux linux kernel7.0
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
- c1f1691ef84fa6d38fa5e5148eca073145e97ffa, 5.17affected
- 20949c3816463e97c6f8fe84c0280c7e5ae83a8d and later · before 060d83bb6147c36fc21134d5b332d266b8c176bcaffected · git
- f1d206181f19b00b275b258fea1418718a2f4173 and later · before df690112b2172e8eb0f4dd8ec1019b65ee979203affected · git
- 4e5bd03ae34652cd932ab4c91c71c511793df75c and later · before 00752893f96b344f258c9c6de18b33171ac4872caffected · git
- 4e5bd03ae34652cd932ab4c91c71c511793df75c and later · before 2de5c8eea0a9db99dae7c36f4b541b74b41d3a04affected · git
- 4e5bd03ae34652cd932ab4c91c71c511793df75c and later · before a0f661918edc79d7a75e468128af8d41e2a1a83aaffected · git
- 4e5bd03ae34652cd932ab4c91c71c511793df75c and later · before d4cc7e4c80b1634c7b1497574a2fdb18df6c026caffected · git
- 4e5bd03ae34652cd932ab4c91c71c511793df75c and later · before f5b94654a4a19891a8108d66ef166de6c028c6cdaffected · git
- 4e5bd03ae34652cd932ab4c91c71c511793df75c and later · before 2884bf72fb8f03409e423397319205de48adca16affected · git
- 5.10.94 and later · before 5.10.273affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | kernel | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k-core | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-core | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-devel | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-devel-matched | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-modules | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-modules-core | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-modules-extra | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k-devel | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k-devel-matched | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k-modules | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k-modules-core | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-64k-modules-extra | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-abi-stablelists | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-abi-stablelists | before 6.12.0-124.55.1.el10_1 | 6.12.0-124.55.1.el10_1 |
| AlmaLinux:10 | kernel-core | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-cross-headers | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-debug | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-debug-core | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-debug-devel | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-debug-devel-matched | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
| AlmaLinux:10 | kernel-debug-modules | before 6.12.0-211.22.1.el10_2 | 6.12.0-211.22.1.el10_2 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- 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 KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2026-31417Apr 13, 2026 · net/x25: Fix overflow when accumulating packets30Monitor
- ← EarlierCVE-2026-31418Apr 13, 2026 · netfilter: ipset: drop logically empty buckets in mtype_del22Monitor
- Later →CVE-2026-31421Apr 13, 2026 · net/sched: cls_fw: fix NULL pointer dereference on shared blocks22Monitor
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 | 00752893f96b344f258c9c6de18b33171ac4872c | Vendor (CNA) |
| Linux Linux | 060d83bb6147c36fc21134d5b332d266b8c176bc | Vendor (CNA) |
| Linux Linux | 2884bf72fb8f03409e423397319205de48adca16 | Vendor (CNA) |
| Linux Linux | 2de5c8eea0a9db99dae7c36f4b541b74b41d3a04 | Vendor (CNA) |
| Linux Linux | 5.10.273 | Vendor (CNA) |
| Linux Linux | 5.15.224 | Vendor (CNA) |
| Linux Linux | 5.17 | Vendor (CNA) |
| Linux Linux | a0f661918edc79d7a75e468128af8d41e2a1a83a | Vendor (CNA) |
| Linux Linux | d4cc7e4c80b1634c7b1497574a2fdb18df6c026c | Vendor (CNA) |
| Linux Linux | df690112b2172e8eb0f4dd8ec1019b65ee979203 | Vendor (CNA) |
| Linux Linux | f5b94654a4a19891a8108d66ef166de6c028c6cd | Vendor (CNA) |
| almalinux:kernel | 6.12.0-211.22.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k | 6.12.0-211.22.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-core | 6.12.0-211.22.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug | 6.12.0-211.22.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug-core | 6.12.0-211.22.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel | 6.12.0-211.22.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel-matched | 6.12.0-211.22.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules | 6.12.0-211.22.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-core | 6.12.0-211.22.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-extra | 6.12.0-211.22.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-abi-stablelists | 6.12.0-124.55.1.el10_1 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-doc | 6.12.0-124.55.1.el10_1 · AlmaLinux:10 | Package registry (OSV) |
| debian:linux | 6.1.187-1 · Debian:12 | Package registry (OSV) |
| red hat:kernel-64k-debug-debuginfo | 0:6.12.0-124.55.1.el10_1 · Red Hat:enterprise_linux:10.1 | Package registry (OSV) |
| red hat:kernel-64k-debug-devel | 0:6.12.0-124.55.1.el10_1 · Red Hat:enterprise_linux:10.1 | Package registry (OSV) |
| red hat:kernel-64k-debug-devel-matched | 0:6.12.0-124.55.1.el10_1 · Red Hat:enterprise_linux:10.1 | Package registry (OSV) |
| red hat:kernel-64k-debuginfo | 0:6.12.0-124.55.1.el10_1 · Red Hat:enterprise_linux:10.1 | Package registry (OSV) |
| red hat:kernel-64k-devel | 0:6.12.0-124.55.1.el10_1 · Red Hat:enterprise_linux:10.1 | Package registry (OSV) |
| red hat:kernel-64k-devel-matched | 0:6.12.0-124.55.1.el10_1 · Red Hat:enterprise_linux:10.1 | Package registry (OSV) |
+8
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 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)
CWE-416 · Use After FreeCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
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 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
free(dev->buf);
/* ... another thread is still running ... */
process(dev->buf);Fixed
lock(&dev->lock);
free(dev->buf);
dev->buf = NULL;
unlock(&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— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- git.kernel.org/stable/c/060d83bb6147c36fc21134d5b332d266b8c176bc
- git.kernel.org/stable/c/2884bf72fb8f03409e423397319205de48adca16
- git.kernel.org/stable/c/2de5c8eea0a9db99dae7c36f4b541b74b41d3a04
- git.kernel.org/stable/c/a0f661918edc79d7a75e468128af8d41e2a1a83a
- git.kernel.org/stable/c/d4cc7e4c80b1634c7b1497574a2fdb18df6c026c
- git.kernel.org/stable/c/df690112b2172e8eb0f4dd8ec1019b65ee979203
- git.kernel.org/stable/c/f5b94654a4a19891a8108d66ef166de6c028c6cd
- access.redhat.com/errata/RHSA-2026:13566
- access.redhat.com/errata/RHSA-2026:19521
- access.redhat.com/errata/RHSA-2026:21209
- access.redhat.com/errata/RHSA-2026:22334
- access.redhat.com/errata/RHSA-2026:22900
- access.redhat.com/errata/RHSA-2026:22940
- access.redhat.com/errata/RHSA-2026:23224
- access.redhat.com/errata/RHSA-2026:25191
- access.redhat.com/errata/RHSA-2026:25217
- access.redhat.com/errata/RHSA-2026:27353
- access.redhat.com/errata/RHSA-2026:27354
- access.redhat.com/errata/RHSA-2026:35870
Vendor advisories and official records. Exploit/PoC links are deliberately left out.