NVD / CVE Program· CNA Linux

CVE-2022-48956: ipv6: avoid use-after-free in ip6_fragment()

Noroxi assessment

Priority: Monitor (action score 31/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.26% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 6b6d3be3661bff2746cab26147bd629aa034e094, 7390c70bd431cbfa6951477e2c80a301643e284b, 7e0dcd5f3ade221a6126278aca60c8ab4cc3bce9.

Low priority for now. Upgrade to Linux Linux 6b6d3be3661bff2746cab26147bd629aa034e094, 7390c70bd431cbfa6951477e2c80a301643e284b, 7e0dcd5f3ade221a6126278aca60c8ab4cc3bce9 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ipv6: avoid use-after-free in ip6_fragment() Blamed commit claimed rcu_read_lock() was held by ip6_fragment() callers. It seems to not be always true, at least for UDP stack. syzbot reported: BUG: KASAN: use-after-free in ip6_dst_idev include/net/ip6_fib.h:245 [inline] BUG: KASAN: use-after-free in ip6_fragment+0x2724/0x2770 net/ipv6/ip6_output.c:951 Read of size 8 at addr ffff88801d403e80 by task syz-executor.3/7618 CPU: 1 PID: 7618 Comm: syz-executor.3 Not tainted 6.1.0-rc6-syzkaller-00012-g4312098baf37 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 ip6_dst_idev include/net/ip6_fib.h:245 [inline] ip6_fragment+0x2724/0x2770 net/ipv6/ip6_output.c:951 __ip6_finish_output net/ipv6/ip6_output.c:193 [inline] ip6_finish_output+0x9a3/0x1170 net/ipv6/ip6_output.c:206 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227 dst_output include/net/dst.h:445 [inline] ip6_local_out+0xb3/0x1a0 net/ipv6/output_core.c:161 ip6_send_skb+0xbb/0x340 net/ipv6/ip6_output.c:1966 udp_v6_send_skb+0x82a/0x18a0 net/ipv6/udp.c:1286 udp_v6_push_pending_frames+0x140/0x200 net/ipv6/udp.c:1313 udpv6_sendmsg+0x18da/0x2c80 net/ipv6/udp.c:1606 inet6_sendmsg+0x9d/0xe0 net/ipv6/af_inet6.c:665 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 sock_write_iter+0x295/0x3d0 net/socket.c:1108 call_write_iter include/linux/fs.h:2191 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x9ed/0xdd0 fs/read_write.c:584 ksys_write+0x1ec/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fde3588c0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fde365b6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fde359ac050 RCX: 00007fde3588c0d9 RDX: 000000000000ffdc RSI: 00000000200000c0 RDI: 000000000000000a RBP: 00007fde358e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fde35acfb1f R14: 00007fde365b6300 R15: 0000000000022000 </TASK> Allocated by task 7618: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x82/0x90 mm/kasan/common.c:325 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x2b4/0x3d0 mm/slub.c:3422 dst_alloc+0x14a/0x1f0 net/core/dst.c:92 ip6_dst_alloc+0x32/0xa0 net/ipv6/route.c:344 ip6_rt_pcpu_alloc net/ipv6/route.c:1369 [inline] rt6_make_pcpu_route net/ipv6/route.c:1417 [inline] ip6_pol_route+0x901/0x1190 net/ipv6/route.c:2254 pol_lookup_func include/net/ip6_fib.h:582 [inline] fib6_rule_lookup+0x52e/0x6f0 net/ipv6/fib6_rules.c:121 ip6_route_output_flags_noref+0x2e6/0x380 net/ipv6/route.c:2625 ip6_route_output_flags+0x76/0x320 net/ipv6/route.c:2638 ip6_route_output include/net/ip6_route.h:98 [inline] ip6_dst_lookup_tail+0x5ab/0x1620 net/ipv6/ip6_output.c:1092 ip6_dst_lookup_flow+0x90/0x1d0 net/ipv6/ip6_output.c:1222 ip6_sk_dst_lookup_flow+0x553/0x980 net/ipv6/ip6_output.c:1260 udpv6_sendmsg+0x151d/0x2c80 net/ipv6/udp.c:1554 inet6_sendmsg+0x9d/0xe0 net/ipv6/af_inet6.c:665 sock_sendmsg_nosec n ---truncated---

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: Oct 21, 2024
Updated: Aug 5, 2026
EPSS: 0.2% · 18th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 7.8
CNA · Linux: 7.8; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel4.13 and later · before 4.14.302
linux linux kernel4.15 and later · before 4.19.269
linux linux kernel4.20 and later · before 5.4.227
linux linux kernel5.5 and later · before 5.10.159
linux linux kernel5.11 and later · before 5.15.83
linux linux kernel5.16 and later · before 6.0.13
linux linux kernel6.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 4.13affected
- 1758fd4688eb92c796e75bdb1d256dc558ef9581 and later · before b3d7ff8c04a83279fb7641fc4d5aa82a602df7c0affected · git
- 1758fd4688eb92c796e75bdb1d256dc558ef9581 and later · before 7e0dcd5f3ade221a6126278aca60c8ab4cc3bce9affected · git
- 1758fd4688eb92c796e75bdb1d256dc558ef9581 and later · before 6b6d3be3661bff2746cab26147bd629aa034e094affected · git
- 1758fd4688eb92c796e75bdb1d256dc558ef9581 and later · before 8208d7e56b1e579320b9ff3712739ad2e63e1f86affected · git
- 1758fd4688eb92c796e75bdb1d256dc558ef9581 and later · before 7390c70bd431cbfa6951477e2c80a301643e284baffected · git
- 1758fd4688eb92c796e75bdb1d256dc558ef9581 and later · before 9b1a468a455d8319041528778d0e684a4c062792affected · git
- 1758fd4688eb92c796e75bdb1d256dc558ef9581 and later · before 803e84867de59a1e5d126666d25eb4860cfd2ebeaffected · git
- before 4.13not affected · semver
- 4.14.302 and later · up to and including 4.14.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.4-1	6.1.4-1
openSUSE:Leap 15.5	kernel-azure	before 5.14.21-150500.33.72.1	5.14.21-150500.33.72.1
openSUSE:Leap 15.5	kernel-rt_debug	before 5.14.21-150500.13.76.1	5.14.21-150500.13.76.1
openSUSE:Leap 15.5	kernel-source-azure	before 5.14.21-150500.33.72.1	5.14.21-150500.33.72.1
openSUSE:Leap 15.5	kernel-source-rt	before 5.14.21-150500.13.76.1	5.14.21-150500.13.76.1
openSUSE:Leap 15.5	kernel-syms-azure	before 5.14.21-150500.33.72.1	5.14.21-150500.33.72.1
openSUSE:Leap 15.5	kernel-syms-rt	before 5.14.21-150500.13.76.1	5.14.21-150500.13.76.1
openSUSE:Leap Micro 5.5	kernel-rt	before 5.14.21-150500.13.76.1	5.14.21-150500.13.76.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS	kernel-default-base	before 5.3.18-150200.24.209.1.150200.9.109.1	5.3.18-150200.24.209.1.150200.9.109.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS	kernel-docs	before 5.3.18-150200.24.209.2	5.3.18-150200.24.209.2
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS	kernel-obs-build	before 5.3.18-150200.24.209.1	5.3.18-150200.24.209.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS	kernel-preempt	before 5.3.18-150200.24.209.1	5.3.18-150200.24.209.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS	kernel-source	before 5.3.18-150200.24.209.1	5.3.18-150200.24.209.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS	kernel-syms	before 5.3.18-150200.24.209.1	5.3.18-150200.24.209.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-64kb	before 5.3.18-150300.59.182.1	5.3.18-150300.59.182.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-default-base	before 5.3.18-150300.59.182.1.150300.18.107.1	5.3.18-150300.59.182.1.150300.18.107.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-docs	before 5.3.18-150300.59.182.2	5.3.18-150300.59.182.2
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-obs-build	before 5.3.18-150300.59.182.1	5.3.18-150300.59.182.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-preempt	before 5.3.18-150300.59.182.1	5.3.18-150300.59.182.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-source	before 5.3.18-150300.59.182.1	5.3.18-150300.59.182.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-syms	before 5.3.18-150300.59.182.1	5.3.18-150300.59.182.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-64kb	before 5.14.21-150400.24.141.1	5.14.21-150400.24.141.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-docs	before 5.14.21-150400.24.141.1	5.14.21-150400.24.141.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-obs-build	before 5.14.21-150400.24.141.1	5.14.21-150400.24.141.1

+91

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
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CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2022-48954Oct 21, 2024 · s390/qeth: fix use-after-free in hsci
31Monitor
← EarlierCVE-2022-48955Oct 21, 2024 · net: thunderbolt: fix memory leak in tbnet_open()
22Monitor
Later →CVE-2022-48957Oct 21, 2024 · dpaa2-switch: Fix memory leak in dpaa2_switch_acl_entry_add() and dpaa2_switch_acl_entry_remove()
22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	6b6d3be3661bff2746cab26147bd629aa034e094	Vendor (CNA)
Linux Linux	7390c70bd431cbfa6951477e2c80a301643e284b	Vendor (CNA)
Linux Linux	7e0dcd5f3ade221a6126278aca60c8ab4cc3bce9	Vendor (CNA)
Linux Linux	803e84867de59a1e5d126666d25eb4860cfd2ebe	Vendor (CNA)
Linux Linux	8208d7e56b1e579320b9ff3712739ad2e63e1f86	Vendor (CNA)
Linux Linux	9b1a468a455d8319041528778d0e684a4c062792	Vendor (CNA)
Linux Linux	b3d7ff8c04a83279fb7641fc4d5aa82a602df7c0	Vendor (CNA)
debian:linux	6.1.4-1 · Debian:12	Package registry (OSV)
opensuse:kernel-azure	5.14.21-150500.33.72.1 · openSUSE:Leap 15.5	Package registry (OSV)
opensuse:kernel-rt	5.14.21-150500.13.76.1 · openSUSE:Leap Micro 5.5	Package registry (OSV)
opensuse:kernel-rt_debug	5.14.21-150500.13.76.1 · openSUSE:Leap 15.5	Package registry (OSV)
opensuse:kernel-source-azure	5.14.21-150500.33.72.1 · openSUSE:Leap 15.5	Package registry (OSV)
opensuse:kernel-source-rt	5.14.21-150500.13.76.1 · openSUSE:Leap 15.5	Package registry (OSV)
opensuse:kernel-syms-azure	5.14.21-150500.33.72.1 · openSUSE:Leap 15.5	Package registry (OSV)
opensuse:kernel-syms-rt	5.14.21-150500.13.76.1 · openSUSE:Leap 15.5	Package registry (OSV)
suse:kernel-azure	5.14.21-150500.33.72.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5	Package registry (OSV)
suse:kernel-default	4.12.14-122.234.1 · SUSE:Linux Enterprise Live Patching 12 SP5	Package registry (OSV)
suse:kernel-default-base	5.3.18-150200.24.209.1.150200.9.109.1 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS	Package registry (OSV)
suse:kernel-livepatch-SLE15-SP2_Update_54	1-150200.5.3.1 · SUSE:Linux Enterprise Live Patching 15 SP2	Package registry (OSV)
suse:kernel-livepatch-SLE15-SP5-RT_Update_22	1-150500.11.3.1 · SUSE:Linux Enterprise Live Patching 15 SP5	Package registry (OSV)
suse:kernel-rt	5.14.21-150500.13.76.1 · SUSE:Linux Enterprise Micro 5.5	Package registry (OSV)
suse:kernel-rt_debug	5.14.21-150500.13.76.1 · SUSE:Real Time Module 15 SP5	Package registry (OSV)
suse:kernel-source-azure	5.14.21-150500.33.72.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5	Package registry (OSV)
suse:kernel-source-rt	5.14.21-150500.13.76.1 · SUSE:Linux Enterprise Micro 5.5	Package registry (OSV)
suse:kernel-syms-azure	5.14.21-150500.33.72.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5	Package registry (OSV)
suse:kernel-syms-rt	5.14.21-150500.13.76.1 · SUSE:Real Time Module 15 SP5	Package registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_62	1-8.3.1 · SUSE:Linux Enterprise Live Patching 12 SP5	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/6b6d3be3661bff2746cab26147bd629aa034e094

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records