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Linux KernelOperating system · Linux

CVE-2024-36886

HIGH · 7.8 CVSS v3.1 Published 2024-05-30
Fix available
A fix is available. Upgrade to 4.19.314 / 5.4.276 or later.
See remediation →
80/100
Remediation priority · High
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In the Linux kernel, the following vulnerability has been resolved: tipc: fix UAF in error path Sam Page (sam4k) working with Trend Micro Zero Day Initiative reported a UAF in the tipc_buf_append() error path: BUG: KASAN: slab-use-after-free in kfree_skb_list_reason+0x47e/0x4c0 linux/net/core/skbuff.c:1183 Read of size 8 at addr ffff88804d2a7c80 by task poc/8034 CPU: 1 PID: 8034 Comm: poc Not tainted 6.8.2 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-5 04/01/2014 Call Trace: <IRQ> __dump_stack linux/lib/dump_stack.c:88 dump_stack_lvl+0xd9/0x1b0 linux/lib/dump_stack.c:106 print_address_description linux/mm/kasan/report.c:377 print_report+0xc4/0x620 linux/mm/kasan/report.c:488 kasan_report+0xda/0x110 linux/mm/kasan/report.c:601 kfree_skb_list_reason+0x47e/0x4c0 linux/net/core/skbuff.c:1183 skb_release_data+0x5af/0x880 linux/net/core/skbuff.c:1026 skb_release_all linux/net/core/skbuff.c:1094 __kfree_skb linux/net/core/skbuff.c:1108 kfree_skb_reason+0x12d/0x210 linux/net/core/skbuff.c:1144 kfree_skb linux/./include/linux/skbuff.h:1244 tipc_buf_append+0x425/0xb50 linux/net/tipc/msg.c:186 tipc_link_input+0x224/0x7c0 linux/net/tipc/link.c:1324 tipc_link_rcv+0x76e/0x2d70 linux/net/tipc/link.c:1824 tipc_rcv+0x45f/0x10f0 linux/net/tipc/node.c:2159 tipc_udp_recv+0x73b/0x8f0 linux/net/tipc/udp_media.c:390 udp_queue_rcv_one_skb+0xad2/0x1850 linux/net/ipv4/udp.c:2108 udp_queue_rcv_skb+0x131/0xb00 linux/net/ipv4/udp.c:2186 udp_unicast_rcv_skb+0x165/0x3b0 linux/net/ipv4/udp.c:2346 __udp4_lib_rcv+0x2594/0x3400 linux/net/ipv4/udp.c:2422 ip_protocol_deliver_rcu+0x30c/0x4e0 linux/net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2e4/0x520 linux/net/ipv4/ip_input.c:233 NF_HOOK linux/./include/linux/netfilter.h:314 NF_HOOK linux/./include/linux/netfilter.h:308 ip_local_deliver+0x18e/0x1f0 linux/net/ipv4/ip_input.c:254 dst_input linux/./include/net/dst.h:461 ip_rcv_finish linux/net/ipv4/ip_input.c:449 NF_HOOK linux/./include/linux/netfilter.h:314 NF_HOOK linux/./include/linux/netfilter.h:308 ip_rcv+0x2c5/0x5d0 linux/net/ipv4/ip_input.c:569 __netif_receive_skb_one_core+0x199/0x1e0 linux/net/core/dev.c:5534 __netif_receive_skb+0x1f/0x1c0 linux/net/core/dev.c:5648 process_backlog+0x101/0x6b0 linux/net/core/dev.c:5976 __napi_poll.constprop.0+0xba/0x550 linux/net/core/dev.c:6576 napi_poll linux/net/core/dev.c:6645 net_rx_action+0x95a/0xe90 linux/net/core/dev.c:6781 __do_softirq+0x21f/0x8e7 linux/kernel/softirq.c:553 do_softirq linux/kernel/softirq.c:454 do_softirq+0xb2/0xf0 linux/kernel/softirq.c:441 </IRQ> <TASK> __local_bh_enable_ip+0x100/0x120 linux/kernel/softirq.c:381 local_bh_enable linux/./include/linux/bottom_half.h:33 rcu_read_unlock_bh linux/./include/linux/rcupdate.h:851 __dev_queue_xmit+0x871/0x3ee0 linux/net/core/dev.c:4378 dev_queue_xmit linux/./include/linux/netdevice.h:3169 neigh_hh_output linux/./include/net/neighbour.h:526 neigh_output linux/./include/net/neighbour.h:540 ip_finish_output2+0x169f/0x2550 linux/net/ipv4/ip_output.c:235 __ip_finish_output linux/net/ipv4/ip_output.c:313 __ip_finish_output+0x49e/0x950 linux/net/ipv4/ip_output.c:295 ip_finish_output+0x31/0x310 linux/net/ipv4/ip_output.c:323 NF_HOOK_COND linux/./include/linux/netfilter.h:303 ip_output+0x13b/0x2a0 linux/net/ipv4/ip_output.c:433 dst_output linux/./include/net/dst.h:451 ip_local_out linux/net/ipv4/ip_output.c:129 ip_send_skb+0x3e5/0x560 linux/net/ipv4/ip_output.c:1492 udp_send_skb+0x73f/0x1530 linux/net/ipv4/udp.c:963 udp_sendmsg+0x1a36/0x2b40 linux/net/ipv4/udp.c:1250 inet_sendmsg+0x105/0x140 linux/net/ipv4/af_inet.c:850 sock_sendmsg_nosec linux/net/socket.c:730 __sock_sendmsg linux/net/socket.c:745 __sys_sendto+0x42c/0x4e0 linux/net/socket.c:2191 __do_sys_sendto linux/net/socket.c:2203 __se_sys_sendto linux/net/socket.c:2199 __x64_sys_sendto+0xe0/0x1c0 linux/net/socket.c:2199 do_syscall_x64 linux/arch/x86/entry/common.c:52 do_syscall_ ---truncated---

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-416

Memory is used after it has been freed, so its contents — now potentially attacker-controlled — drive the program's behaviour. With careful heap grooming this becomes code execution. The fix requires disciplined ownership of memory and often a targeted rework of the object lifecycle.

General guidance for the use after free class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 4.1, < 4.19.314>= 4.20, < 5.4.276>= 5.5, < 5.10.217>= 5.11, < 5.15.159>= 5.16, < 6.1.91>= 6.2, < 6.6.31>= 6.7, < 6.8.10= 6.9
Debian LinuxOperating system
Affected:= 10.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 4.19.314 / 5.4.276 / 5.10.217 or later
Fixed in 4.19.3145.4.2765.10.217
Vendor patch git.kernel.org →
Recommended fix High confidence

Upgrade to Linux kernel 4.19.314+, 5.4.276+, 5.10.217+, or 5.15.159+ (or Debian kernel update via standard apt-get upgrade)

  1. 1. Identify the currently running kernel version using `uname -r`
  2. 2. Check if the system is using a vulnerable kernel version from the affected ranges: >= 4.1 and < 4.19.314, >= 4.20 and < 5.4.276, >= 5.5 and < 5.10.217, or >= 5.11 and < 5.15.159
  3. 3. For Debian 10 (Buster) systems, check for available kernel updates using `apt-get update && apt-cache policy linux-image-*`
  4. 4. Upgrade the kernel to a fixed version: for 4.19.x upgrade to >= 4.19.314, for 5.4.x upgrade to >= 5.4.276, for 5.10.x upgrade to >= 5.10.217, or for 5.15.x upgrade to >= 5.15.159
  5. 5. After kernel upgrade, reboot the system to load the fixed kernel
  6. 6. Verify the fix is applied by checking the kernel version after reboot with `uname -r`
Caveat Kernel upgrades may require system reboot and could have compatibility implications with custom kernel modules or specific hardware drivers; test in staging environment first

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $3,200. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-36886 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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