wifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev()
In the Linux kernel, the following vulnerability has been resolved: wifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev() There is a potential NULL pointer dereference in zd_mac_tx_to_dev(). For example, the following is possible: T0 T1 zd_mac_tx_to_dev() /* len == skb_queue_len(q) */ while (len > ZD_MAC_MAX_ACK_WAITERS) { filter_ack() spin_lock_irqsave(&q->lock, flags); /* position == skb_queue_len(q) */ for (i=1; i<position; i++) skb = __skb_dequeue(q) if (mac->type == NL80211_IFTYPE_AP) skb = __skb_dequeue(q); spin_unlock_irqrestore(&q->lock, flags); skb_dequeue() -> NULL Since there is a small gap between checking skb queue length and skb being unconditionally dequeued in zd_mac_tx_to_dev(), skb_dequeue() can return NULL. Then the pointer is passed to zd_mac_tx_status() where it is dereferenced. In order to avoid potential NULL pointer dereference due to situations like above, check if skb is not NULL before passing it to zd_mac_tx_status(). Found by Linux Verification Center (linuxtesting.org) with SVACE.
- Published
- Aug 16, 2025
- Updated
- Jun 17, 2026
- EPSS
- 0.2% · 5th percentile
- CWE
- CWE-476
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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 · 0.2%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux11.0
- linux linux kernel5.5 and later · before 5.10.240
- linux linux kernel5.11 and later · before 5.15.189
- linux linux kernel5.16 and later · before 6.1.146
- linux linux kernel2.6.25 and later · before 5.4.296
- linux linux kernel6.7 and later · before 6.12.39
- linux linux kernel6.13 and later · before 6.15.7
- linux linux kernel6.2 and later · before 6.6.99
- linux linux kernel6.16
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
- 2.6.25affected
- 459c51ad6e1fc19e91a53798358433d3c08cd09d and later · before c1958270de947604cc6de05fc96dbba256b49cf0affected · git
- 459c51ad6e1fc19e91a53798358433d3c08cd09d and later · before 014c34dc132015c4f918ada4982e952947ac1047affected · git
- 459c51ad6e1fc19e91a53798358433d3c08cd09d and later · before b24f65c184540dfb967479320ecf7e8c2e9220dcaffected · git
- 459c51ad6e1fc19e91a53798358433d3c08cd09d and later · before adf08c96b963c7cd7ec1ee1c0c556228d9bedaaeaffected · git
- 459c51ad6e1fc19e91a53798358433d3c08cd09d and later · before 5420de65efbeb6503bcf1d43451c9df67ad60298affected · git
- 459c51ad6e1fc19e91a53798358433d3c08cd09d and later · before fcd9c923b58e86501450b9b442ccc7ce4a8d0fdaaffected · git
- 459c51ad6e1fc19e91a53798358433d3c08cd09d and later · before 602b4eb2f25668de15de69860ec99caf65b3684daffected · git
- 459c51ad6e1fc19e91a53798358433d3c08cd09d and later · before 74b1ec9f5d627d2bdd5e5b6f3f81c23317657023affected · git
- before 2.6.25not 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 6.1.147-1 | 6.1.147-1 |
| Debian:13 | linux | before 6.12.41-1 | 6.12.41-1 |
| Debian:14 | linux | before 6.16.3-1 | 6.16.3-1 |
| openSUSE:Leap 16.0 | dtb-aarch64 | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-64kb | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-azure | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-default | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-default-base | before 6.12.0-160000.26.1.160000.2.7 | 6.12.0-160000.26.1.160000.2.7 |
| openSUSE:Leap 16.0 | kernel-docs | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-kvmsmall | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-obs-build | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-obs-qa | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-rt | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-source | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-syms | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-zfcpdump | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-azure | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-docs | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-kvmsmall | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-obs-qa | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-zfcpdump | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| SUSE:Linux Micro 6.2 | kernel-64kb | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| SUSE:Linux Micro 6.2 | kernel-default | before 6.12.0-160000.26.1 | 6.12.0-160000.26.1 |
| SUSE:Linux Micro 6.2 | kernel-default-base | before 6.12.0-160000.26.1.160000.2.7 | 6.12.0-160000.26.1.160000.2.7 |
+4
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 | 014c34dc132015c4f918ada4982e952947ac1047 | Vendor (CNA) |
| Linux Linux | 5420de65efbeb6503bcf1d43451c9df67ad60298 | Vendor (CNA) |
| Linux Linux | 602b4eb2f25668de15de69860ec99caf65b3684d | Vendor (CNA) |
| Linux Linux | 74b1ec9f5d627d2bdd5e5b6f3f81c23317657023 | Vendor (CNA) |
| Linux Linux | adf08c96b963c7cd7ec1ee1c0c556228d9bedaae | Vendor (CNA) |
| Linux Linux | b24f65c184540dfb967479320ecf7e8c2e9220dc | Vendor (CNA) |
| Linux Linux | c1958270de947604cc6de05fc96dbba256b49cf0 | Vendor (CNA) |
| Linux Linux | fcd9c923b58e86501450b9b442ccc7ce4a8d0fda | Vendor (CNA) |
| debian:linux | 6.1.147-1 · Debian:12 | Package registry (OSV) |
| opensuse:dtb-aarch64 | 6.12.0-160000.26.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-64kb | 6.12.0-160000.26.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-azure | 6.12.0-160000.26.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-default | 6.12.0-160000.26.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-default-base | 6.12.0-160000.26.1.160000.2.7 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-docs | 6.12.0-160000.26.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 6.12.0-160000.26.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-obs-build | 6.12.0-160000.26.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 6.12.0-160000.26.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-rt | 6.12.0-160000.26.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-source | 6.12.0-160000.26.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-syms | 6.12.0-160000.26.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| suse:kernel-64kb | 6.12.0-160000.26.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-azure | 6.12.0-160000.26.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-default | 6.12.0-160000.26.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-default-base | 6.12.0-160000.26.1.160000.2.7 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-docs | 6.12.0-160000.26.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-kvmsmall | 6.12.0-160000.26.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-obs-build | 6.12.0-160000.26.1 · SUSE:Linux Micro Extras 6.2 | Package registry (OSV) |
| suse:kernel-obs-qa | 6.12.0-160000.26.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-rt | 6.12.0-160000.26.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
+3
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.
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
- 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-476 · NULL Pointer DereferenceCVSS 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.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/014c34dc132015c4f918ada4982e952947ac1047
- git.kernel.org/stable/c/5420de65efbeb6503bcf1d43451c9df67ad60298
- git.kernel.org/stable/c/602b4eb2f25668de15de69860ec99caf65b3684d
- git.kernel.org/stable/c/74b1ec9f5d627d2bdd5e5b6f3f81c23317657023
- git.kernel.org/stable/c/adf08c96b963c7cd7ec1ee1c0c556228d9bedaae
- git.kernel.org/stable/c/b24f65c184540dfb967479320ecf7e8c2e9220dc
- git.kernel.org/stable/c/c1958270de947604cc6de05fc96dbba256b49cf0
- git.kernel.org/stable/c/fcd9c923b58e86501450b9b442ccc7ce4a8d0fda
- lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.