netrom: check buffer length before accessing it
In the Linux kernel, the following vulnerability has been resolved: netrom: check buffer length before accessing it Syzkaller reports an uninit value read from ax25cmp when sending raw message through ieee802154 implementation. ===================================================== BUG: KMSAN: uninit-value in ax25cmp+0x3a5/0x460 net/ax25/ax25_addr.c:119 ax25cmp+0x3a5/0x460 net/ax25/ax25_addr.c:119 nr_dev_get+0x20e/0x450 net/netrom/nr_route.c:601 nr_route_frame+0x1a2/0xfc0 net/netrom/nr_route.c:774 nr_xmit+0x5a/0x1c0 net/netrom/nr_dev.c:144 __netdev_start_xmit include/linux/netdevice.h:4940 [inline] netdev_start_xmit include/linux/netdevice.h:4954 [inline] xmit_one net/core/dev.c:3548 [inline] dev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3564 __dev_queue_xmit+0x33b8/0x5130 net/core/dev.c:4349 dev_queue_xmit include/linux/netdevice.h:3134 [inline] raw_sendmsg+0x654/0xc10 net/ieee802154/socket.c:299 ieee802154_sock_sendmsg+0x91/0xc0 net/ieee802154/socket.c:96 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638 __sys_sendmsg net/socket.c:2667 [inline] __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __x64_sys_sendmsg+0x307/0x490 net/socket.c:2674 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was created at: slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768 slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x5e9/0xb10 mm/slub.c:3523 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560 __alloc_skb+0x318/0x740 net/core/skbuff.c:651 alloc_skb include/linux/skbuff.h:1286 [inline] alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6334 sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2780 sock_alloc_send_skb include/net/sock.h:1884 [inline] raw_sendmsg+0x36d/0xc10 net/ieee802154/socket.c:282 ieee802154_sock_sendmsg+0x91/0xc0 net/ieee802154/socket.c:96 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638 __sys_sendmsg net/socket.c:2667 [inline] __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __x64_sys_sendmsg+0x307/0x490 net/socket.c:2674 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b CPU: 0 PID: 5037 Comm: syz-executor166 Not tainted 6.7.0-rc7-syzkaller-00003-gfbafc3e621c3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 ===================================================== This issue occurs because the skb buffer is too small, and it's actual allocation is aligned. This hides an actual issue, which is that nr_route_frame does not validate the buffer size before using it. Fix this issue by checking skb->len before accessing any fields in skb->data. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Noroxi analysis
No Noroxi analysis for this record yet
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We use this product, ask for help- Published
- Jan 15, 2025
- Updated
- Aug 5, 2026
- EPSS
- 0.6% · 47th percentile
- CWE
- CWE-908
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Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 5.5
- CNA · Linux
- 9.4
- 3.9 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| 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 kernel2.6.12 and later · before 5.4.289
- linux linux kernel5.5 and later · before 5.10.233
- linux linux kernel5.11 and later · before 5.15.176
- linux linux kernel5.16 and later · before 6.1.124
- linux linux kernel6.2 and later · before 6.6.70
- linux linux kernel6.7 and later · before 6.12.9
- linux linux kernel6.13
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
- 2.6.12affected
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 64e9f54a14f2887be8634fb85cd2f13bec18a184affected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before cf6befa7c569787f53440274bbed1405fc07738daffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 769e36c2119a51070faf58819c58274f57a088dbaffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 78a110332ae268d0b005247c3b9a7d703b875c49affected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before f647d72245aadce30618f4c8fd3803904418dbecaffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 3ba7f80d98d4965349cfcd258dd78418496c1625affected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before a4fd163aed2edd967a244499754dec991d8b4c7daffected · git
- before 2.6.12not affected · semver
- 5.4.289 and later · up to and including 5.4.*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 6.1.124-1 | 6.1.124-1 |
| Debian:13 | linux | before 6.12.9-1 | 6.12.9-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- 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 KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
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 | 3ba7f80d98d4965349cfcd258dd78418496c1625 | Vendor (CNA) |
| Linux Linux | 64e9f54a14f2887be8634fb85cd2f13bec18a184 | Vendor (CNA) |
| Linux Linux | 769e36c2119a51070faf58819c58274f57a088db | Vendor (CNA) |
| Linux Linux | 78a110332ae268d0b005247c3b9a7d703b875c49 | Vendor (CNA) |
| Linux Linux | a4fd163aed2edd967a244499754dec991d8b4c7d | Vendor (CNA) |
| Linux Linux | cf6befa7c569787f53440274bbed1405fc07738d | Vendor (CNA) |
| Linux Linux | f647d72245aadce30618f4c8fd3803904418dbec | Vendor (CNA) |
| debian:linux | 6.1.124-1 · Debian:12 | 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.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
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 researchersFinders, 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.
- CVE-2024-5030258 days apartHID: core: zero-initialize the report bufferKEV52Plan
- CVE-2026-52989525 days apartnvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers39Monitor
- CVE-2024-4768586 days apartnetfilter: nf_reject_ipv6: fix nf_reject_ip6_tcphdr_put()36Monitor
- CVE-2026-53225526 days apartsctp: fix uninit-value in __sctp_rcv_asconf_lookup()36Monitor
- CVE-2026-53170526 days apartaccel/ethosu: reject DMA commands with uninitialized length35Monitor
- CVE-2026-43139476 days apartxfrm6: fix uninitialized saddr in xfrm6_get_saddr()34Monitor
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
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-908 · Use of Uninitialized ResourceCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
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✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/3ba7f80d98d4965349cfcd258dd78418496c1625
- git.kernel.org/stable/c/64e9f54a14f2887be8634fb85cd2f13bec18a184
- git.kernel.org/stable/c/769e36c2119a51070faf58819c58274f57a088db
- git.kernel.org/stable/c/78a110332ae268d0b005247c3b9a7d703b875c49
- git.kernel.org/stable/c/a4fd163aed2edd967a244499754dec991d8b4c7d
- git.kernel.org/stable/c/cf6befa7c569787f53440274bbed1405fc07738d
- git.kernel.org/stable/c/f647d72245aadce30618f4c8fd3803904418dbec
- lists.debian.org/debian-lts-announce/2025/03/msg00001.html
- lists.debian.org/debian-lts-announce/2025/03/msg00002.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.