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NVD / CVE Program· CNA Linux

CVE-2026-64573: Bluetooth: qca: fix NVM tag length underflow in TLV parser

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.16% (FIRST EPSS).
  • Fixed version: Linux Linux 4fcfb5b2c736785464ff9745f94c6726c5ee2d85, 5.15.216, 59fd2f075bca94f030c7c78e94878ea0803d7690; azl3 kernel 6.6.145.2-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 4fcfb5b2c736785464ff9745f94c6726c5ee2d85, 5.15.216, 59fd2f075bca94f030c7c78e94878ea0803d7690; azl3 kernel 6.6.145.2-1 on Azure Linux 3.0 6.6.150.1-1 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: Bluetooth: qca: fix NVM tag length underflow in TLV parser In the TLV_TYPE_NVM branch of qca_tlv_check_data() the tag loop bound is "while (idx < length - sizeof(struct tlv_type_nvm))". "length" is a signed int from the firmware TLV header and sizeof(struct tlv_type_nvm) is a size_t (12), so "length" is converted to size_t and any firmware-supplied "length" < 12 makes the subtraction wrap to a huge value. The loop body then reads a 12-byte struct tlv_type_nvm past the end of the short vmalloc'd firmware buffer (and the EDL_TAG_ID_* handlers can write past it). Rewrite the bound as "idx + sizeof(struct tlv_type_nvm) <= length"; both operands are non-negative, so it no longer underflows and a "length" too small for one record correctly skips the loop. BUG: KASAN: vmalloc-out-of-bounds in qca_download_firmware.isra.0 (drivers/bluetooth/btqca.c:421) Read of size 2 at addr ffffc900000e5004 by task kworker/u9:0/52 Workqueue: hci0 hci_power_on Call Trace: ... kasan_report (mm/kasan/report.c:595) qca_download_firmware.isra.0 (drivers/bluetooth/btqca.c:421 drivers/bluetooth/btqca.c:617) qca_uart_setup (drivers/bluetooth/btqca.c:948) qca_setup (drivers/bluetooth/hci_qca.c:2029) hci_uart_setup (drivers/bluetooth/hci_ldisc.c:438) hci_dev_open_sync (net/bluetooth/hci_sync.c:5227) hci_power_on (net/bluetooth/hci_core.c:920) process_one_work (kernel/workqueue.c:3322) worker_thread (kernel/workqueue.c:3486) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245)

—No exploit Fix available
Published
Aug 5, 2026
Updated
Aug 19, 2026
EPSS
0.1% · 5th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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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.

—

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

    • 02f05ed44b71152d5e11d29be28aed91c0489b4e, 6.9affected
    • ed53949cc92e28aaa3463d246942bda1fbb7f307 and later · before a7ee11441d71ab036a705d110a415421f5a4a898affected · git
    • 1caceadfb50432dbf6d808796cb6c34ebb6d662c and later · before 5d34e537755d2f9eba2d4e54d70126f987ef20b4affected · git
    • 427281f9498ed614f9aabc80e46ec077c487da6d and later · before 70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24affected · git
    • 2e4edfa1e2bd821a317e7d006517dcf2f3fac68d and later · before 59fd2f075bca94f030c7c78e94878ea0803d7690affected · git
    • 2e4edfa1e2bd821a317e7d006517dcf2f3fac68d and later · before a087ed960fce54e9302796229e9d545bbc9bcd4aaffected · git
    • 2e4edfa1e2bd821a317e7d006517dcf2f3fac68d and later · before 4fcfb5b2c736785464ff9745f94c6726c5ee2d85affected · git
    • 2e4edfa1e2bd821a317e7d006517dcf2f3fac68d and later · before c90164ca0f7036942ba088eb7ea8d3f6c2352020affected · git
    • 5.15.159 and later · before 5.15.216affected · semver
    • 6.1.91 and later · before 6.1.183affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.101-1~deb12u16.12.101-1~deb12u1
Debian:13linuxbefore 6.12.101-16.12.101-1
Debian:14linuxbefore 7.1.6-17.1.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-64571Aug 5, 2026 · wifi: p54: validate RX frame length in p54_rx_eeprom_readback()
    0Monitor
  • ← EarlierCVE-2026-64572Aug 5, 2026 · ipv4: fib: free fib_alias with kfree_rcu() on insert error path
    0Monitor
  • Later →CVE-2026-64577Aug 5, 2026 · gtp: check skb_pull_data() return in gtp1u_send_echo_resp()
    30Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
Linux Linux4fcfb5b2c736785464ff9745f94c6726c5ee2d85Vendor (CNA)
Linux Linux5.15.216Vendor (CNA)
Linux Linux59fd2f075bca94f030c7c78e94878ea0803d7690Vendor (CNA)
Linux Linux5d34e537755d2f9eba2d4e54d70126f987ef20b4Vendor (CNA)
Linux Linux6.1.183Vendor (CNA)
Linux Linux6.6.148Vendor (CNA)
Linux Linux6.9Vendor (CNA)
Linux Linux70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24Vendor (CNA)
Linux Linuxa087ed960fce54e9302796229e9d545bbc9bcd4aVendor (CNA)
Linux Linuxa7ee11441d71ab036a705d110a415421f5a4a898Vendor (CNA)
Linux Linuxc90164ca0f7036942ba088eb7ea8d3f6c2352020Vendor (CNA)
azl3 kernel 6.6.145.2-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package 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.

EPSS, last 120 days

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 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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

  1. Fix✗ → ✓

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References

Show all references (6 more)

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

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