CVE-2026-31419
- Source
- https://cve.org/CVERecord?id=CVE-2026-31419
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31419.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2026-31419
- Downstream
- Related
- Published
- 2026-04-13T13:40:23.279Z
- Modified
- 2026-06-22T12:14:14.698089900Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- net: bonding: fix use-after-free in bond_xmit_broadcast()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
net: bonding: fix use-after-free in bondxmitbroadcast()
bondxmitbroadcast() reuses the original skb for the last slave (determined by bondislast_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 bondislastslave() check with a simple index comparison (i + 1 == slavescount) 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> dumpstacklvl (lib/dumpstack.c:123) printreport (mm/kasan/report.c:379 mm/kasan/report.c:482) kasanreport (mm/kasan/report.c:597) skbclone (include/linux/skbuff.h:1724 include/linux/skbuff.h:1792 include/linux/skbuff.h:3396 net/core/skbuff.c:2108) bondxmitbroadcast (drivers/net/bonding/bondmain.c:5334) bondstartxmit (drivers/net/bonding/bondmain.c:5567 drivers/net/bonding/bondmain.c:5593) devhardstartxmit (include/linux/netdevice.h:5325 include/linux/netdevice.h:5334 net/core/dev.c:3871 net/core/dev.c:3887) __devqueuexmit (include/linux/netdevice.h:3601 net/core/dev.c:4838) ip6finishoutput2 (include/net/neighbour.h:540 include/net/neighbour.h:554 net/ipv6/ip6output.c:136) ip6finishoutput (net/ipv6/ip6output.c:208 net/ipv6/ip6output.c:219) ip6output (net/ipv6/ip6output.c:250) ip6sendskb (net/ipv6/ip6output.c:1985) udpv6sendskb (net/ipv6/udp.c:1442) udpv6sendmsg (net/ipv6/udp.c:1733) __sys_sendto (net/socket.c:730 net/socket.c:742 net/socket.c:2206) _x64syssendto (net/socket.c:2209) dosyscall64 (arch/x86/entry/syscall64.c:63 arch/x86/entry/syscall64.c:94) entrySYSCALL64afterhwframe (arch/x86/entry/entry64.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 skbuffheadcache 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
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31419.json" }- References
-
- https://git.kernel.org/stable/c/2884bf72fb8f03409e423397319205de48adca16
- https://git.kernel.org/stable/c/3453882f36c40d2339267093676585a89808a73d
- https://git.kernel.org/stable/c/d4cc7e4c80b1634c7b1497574a2fdb18df6c026c
- https://git.kernel.org/stable/c/f5b94654a4a19891a8108d66ef166de6c028c6cd
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31419.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-31419
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced4e5bd03ae34652cd932ab4c91c71c511793df75cFixed3453882f36c40d2339267093676585a89808a73dFixedd4cc7e4c80b1634c7b1497574a2fdb18df6c026cFixedf5b94654a4a19891a8108d66ef166de6c028c6cdFixed2884bf72fb8f03409e423397319205de48adca16
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedLast affected20949c3816463e97c6f8fe84c0280c7e5ae83a8dLast affectedf1d206181f19b00b275b258fea1418718a2f4173Last affectedc1f1691ef84fa6d38fa5e5148eca073145e97ffa