5.5

CVE-2023-53365: ip6mr: Fix skb_under_panic in ip6mr_cache_report()

Modified
AliasesUBUNTU-CVE-2023-53365DEBIAN-CVE-2023-53365
Published 17-09-2025Last modified 11-05-2026

Vulnerability summary

CVE-2023-53365 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 9.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.19%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 30 · Related 18
RHSA-2024:2394RHSA-2024:3138RHSA-2025:22006RHSA-2025:22066RHSA-2025:22072RHSA-2025:22087

Timeline

  1. 17-09-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.19% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu123 products
  • linuxAll versions (No fix recorded) | < 5.4.0-169.187 | < 5.15.0-88.98
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1116.126 | < 5.15.0-1049.54
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 14fb64e1f449ef6666f1c3a3fa4e13aec669b98d, < a96d74d1076c82a4cef02c150d9996b21354c78d | ≥ 14fb64e1f449ef6666f1c3a3fa4e13aec669b98d, < 8382e7ed2d63e6c2daf6881fa091526dc6c879cd | ≥ 14fb64e1f449ef6666f1c3a3fa4e13aec669b98d, < 0438e60a00d4e335b3c36397dbf26c74b5d13ef0 | ≥ 14fb64e1f449ef6666f1c3a3fa4e13aec669b98d, < 1683124129a4263dd5bce2475bab110e95fa0346 | ≥ 14fb64e1f449ef6666f1c3a3fa4e13aec669b98d, < 1bb54a21f4d9b88442f8c3307c780e2db64417e4 | ≥ 14fb64e1f449ef6666f1c3a3fa4e13aec669b98d, < 691a09eecad97e745b9aa0e3918db46d020bdacb | ≥ 14fb64e1f449ef6666f1c3a3fa4e13aec669b98d, < 3326c711f18d18fe6e1f5d83d3a7eab07e5a1560 | ≥ 14fb64e1f449ef6666f1c3a3fa4e13aec669b98d, < 30e0191b16e8a58e4620fa3e2839ddc7b9d4281c | 2.6.26
  • linux_kernel≥ 2.6.26, < 4.14.322 | ≥ 4.15, < 4.19.291 | ≥ 4.20, < 5.4.253 | ≥ 5.5, < 5.10.190 | ≥ 5.11, < 5.15.126 | ≥ 5.16, < 6.1.45 | ≥ 6.2, < 6.4.10 | 6.5:rc1 | 6.5:rc2 | 6.5:rc3 | 6.5:rc4
Debian1 product
  • linux< 6.1.52-1 | < 6.4.11-1

3 vendors · 126 products

References

12 links
Show all 12 references