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🛡️ CVE-2023-53365 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

ip6mr: Fix skb_under_panic in ip6mr_cache_report()

In the Linux kernel, the following vulnerability has been resolved:

ip6mr: Fix skb_under_panic in ip6mr_cache_report()

skbuff: skb_under_panic: text:ffffffff88771f69 len:56 put:-4

head:ffff88805f86a800 data:ffff887f5f86a850 tail:0x88 end:0x2c0 dev:pim6reg

------------[ cut here ]------------

kernel BUG at net/core/skbuff.c:192!

invalid opcode: 0000 [#1] PREEMPT SMP KASAN

CPU: 2 PID: 22968 Comm: kworker/2:11 Not tainted 6.5.0-rc3-00044-g0a8db05b571a #236

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014

Workqueue: ipv6_addrconf addrconf_dad_work

RIP: 0010:skb_panic+0x152/0x1d0

Call Trace:

<TASK>

skb_push+0xc4/0xe0

ip6mr_cache_report+0xd69/0x19b0

reg_vif_xmit+0x406/0x690

dev_hard_start_xmit+0x17e/0x6e0

__dev_queue_xmit+0x2d6a/0x3d20

vlan_dev_hard_start_xmit+0x3ab/0x5c0

dev_hard_start_xmit+0x17e/0x6e0

__dev_queue_xmit+0x2d6a/0x3d20

neigh_connected_output+0x3ed/0x570

ip6_finish_output2+0x5b5/0x1950

ip6_finish_output+0x693/0x11c0

ip6_output+0x24b/0x880

NF_HOOK.constprop.0+0xfd/0x530

ndisc_send_skb+0x9db/0x1400

ndisc_send_rs+0x12a/0x6c0

addrconf_dad_completed+0x3c9/0xea0

addrconf_dad_work+0x849/0x1420

process_one_work+0xa22/0x16e0

worker_thread+0x679/0x10c0

ret_from_fork+0x28/0x60

ret_from_fork_asm+0x11/0x20

When setup a vlan device on dev pim6reg, DAD ns packet may sent on reg_vif_xmit().

reg_vif_xmit()

ip6mr_cache_report()

skb_push(skb, -skb_network_offset(pkt));//skb_network_offset(pkt) is 4

And skb_push declared as:

void *skb_push(struct sk_buff *skb, unsigned int len);

skb->data -= len;

//0xffff88805f86a84c - 0xfffffffc = 0xffff887f5f86a850

skb->data is set to 0xffff887f5f86a850, which is invalid mem addr, lead to skb_push() fails.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2023-53365 is recorded against 2 packages.

  • kernel (from 6.2.0 up to 6.4.10)
  • linux-kernel

Timeline and source

Published on 17 September 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2023-53365 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-09-17
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.2.0 6.4.10
linux-kernel — —

References

Similar Threats

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