net: bonding: fix use-after-free in bond_xmit_broadcast()
Summary
| CVE | CVE-2026-31419 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-13 14:16:11 UTC |
| Updated | 2026-07-08 13:16:34 UTC |
| Description | 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 ================================================================== |
Risk And Classification
Primary CVSS: v3.1 7 HIGH from ADP
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.000130000 probability, percentile 0.023990000 (date 2026-05-12)
Problem Types: CWE-416 | CWE-416 Use After Free
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | CVSS | 7 | HIGH | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7 | HIGH | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
HighPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 4e5bd03ae34652cd932ab4c91c71c511793df75c 2de5c8eea0a9db99dae7c36f4b541b74b41d3a04 git | Not specified |
| CNA | Linux | Linux | affected 4e5bd03ae34652cd932ab4c91c71c511793df75c a0f661918edc79d7a75e468128af8d41e2a1a83a git | Not specified |
| CNA | Linux | Linux | affected 4e5bd03ae34652cd932ab4c91c71c511793df75c d4cc7e4c80b1634c7b1497574a2fdb18df6c026c git | Not specified |
| CNA | Linux | Linux | affected 4e5bd03ae34652cd932ab4c91c71c511793df75c f5b94654a4a19891a8108d66ef166de6c028c6cd git | Not specified |
| CNA | Linux | Linux | affected 4e5bd03ae34652cd932ab4c91c71c511793df75c 2884bf72fb8f03409e423397319205de48adca16 git | Not specified |
| CNA | Linux | Linux | affected 20949c3816463e97c6f8fe84c0280c7e5ae83a8d git | Not specified |
| CNA | Linux | Linux | affected f1d206181f19b00b275b258fea1418718a2f4173 git | Not specified |
| CNA | Linux | Linux | affected c1f1691ef84fa6d38fa5e5148eca073145e97ffa git | Not specified |
| CNA | Linux | Linux | affected 5.10.94 5.11 semver | Not specified |
| CNA | Linux | Linux | affected 5.15.17 5.16 semver | Not specified |
| CNA | Linux | Linux | affected 5.16.3 5.17 semver | Not specified |
| CNA | Linux | Linux | affected 5.17 | Not specified |
| CNA | Linux | Linux | unaffected 5.17 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.143 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.95 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.22 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.12 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AppStream EUS V. 10.0 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AppStream V. 10 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AppStream E4S V.9.2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AppStream EUS V.9.4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AppStream EUS V.9.6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AppStream V. 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS EUS V. 10.0 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS V. 10 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS V. 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS E4S V.8.8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS TUS V.8.8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS E4S V.9.2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS E4S V.9.4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS EUS V.9.4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS EUS V.9.6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux BaseOS V. 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux CodeReady Linux Builder EUS V. 10.0 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux CodeReady Linux Builder V. 10 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux CRB V. 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat CodeReady Linux Builder EUS V.9.4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat CodeReady Linux Builder EUS V.9.6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux CodeReady Linux Builder V. 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time For NFV EUS V. 10.0 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time For NFV V. 10 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux NFV V. 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time For NFV E4S V.9.2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time For NFV EUS V.9.4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time For NFV EUS V.9.6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time For NFV V. 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time EUS V. 10.0 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time V. 10 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux RT V. 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time E4S V.9.2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time EUS V.9.4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time EUS V.9.6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux Real Time V. 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 7 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:21209 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| git.kernel.org/stable/c/2884bf72fb8f03409e423397319205de48adca16 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| access.redhat.com/errata/RHSA-2026:25217 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36530 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:25191 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| git.kernel.org/stable/c/f5b94654a4a19891a8108d66ef166de6c028c6cd | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| access.redhat.com/errata/RHSA-2026:22334 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36532 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| git.kernel.org/stable/c/d4cc7e4c80b1634c7b1497574a2fdb18df6c026c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| access.redhat.com/errata/RHSA-2026:23224 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:22900 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:19521 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:22940 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:35870 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36533 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31419.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:27354 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:27353 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-31419 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| git.kernel.org/stable/c/2de5c8eea0a9db99dae7c36f4b541b74b41d3a04 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a0f661918edc79d7a75e468128af8d41e2a1a83a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| access.redhat.com/errata/RHSA-2026:36172 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36534 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36531 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:13566 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| git.kernel.org/stable/c/3453882f36c40d2339267093676585a89808a73d | MITRE | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-04-13T00:00:00.000Z | Reported to Red Hat. |
| ADP | 2026-04-13T00:00:00.000Z | Made public. |
Solutions
ADP: RHSA-2026:22334: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)
ADP: RHSA-2026:13566: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10)
ADP: RHSA-2026:25191: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10)
ADP: RHSA-2026:22940: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2)
ADP: RHSA-2026:21209: Red Hat CodeReady Linux Builder EUS (v.9.4), Red Hat Enterprise Linux AppStream EUS (v.9.4), Red Hat Enterprise Linux BaseOS EUS (v.9.4), Red Hat Enterprise Linux Real Time EUS (v.9.4), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)
ADP: RHSA-2026:23224: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat Enterprise Linux Real Time EUS (v.9.6), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)
ADP: RHSA-2026:25217: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9)
ADP: RHSA-2026:35870: Red Hat Enterprise Linux BaseOS (v. 10)
ADP: RHSA-2026:27353: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8)
ADP: RHSA-2026:36530: Red Hat Enterprise Linux BaseOS (v. 8)
ADP: RHSA-2026:19521: Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8)
ADP: RHSA-2026:36531: Red Hat Enterprise Linux BaseOS E4S (v.8.8)
ADP: RHSA-2026:36532: Red Hat Enterprise Linux BaseOS E4S (v.9.2)
ADP: RHSA-2026:36533: Red Hat Enterprise Linux BaseOS E4S (v.9.4)
ADP: RHSA-2026:36534: Red Hat Enterprise Linux BaseOS EUS (v.9.6)
ADP: RHSA-2026:36172: Red Hat Enterprise Linux BaseOS (v. 9)
ADP: RHSA-2026:27354: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8)
ADP: RHSA-2026:22900: Red Hat Enterprise Linux Real Time E4S (v.9.2), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)
There are currently no legacy QID mappings associated with this CVE.