Out-of-bounds Write in Bootloader
Affects the Unisoc Bootloader on listed SC and T series chipsets during firmware update sessions. CVSS rates it 8.4 (high). No fix is listed.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- No fix listed
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Affected Unisoc chipsets: SC9863A, SC9832E, SC7731E, T310, T610, T618, T7200, T7225, T7250, T7255, T7280, T8100, T9100, T8200, T7300, T8300. The bug occurs during firmware update sessions, where a global offset variable is not reset.
- Exploitation0/40No signal
- Exposure5/25Specific setups only
- Reach?/20Reach: unknown (data gap). No tracked technology or package matched
- Severity9.4/10CVSS 8.4, total technical impact per CISA
- No patch5/5No patch listed yet
What would change the score
- Would score about 69 if added to CISA KEV
- Would score about 64 if CISA's SSVC rates exploitation active
- Would score about 29 if CISA's SSVC rates it automatable
CVE-2026-80335 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.4 (high) and affects Bootloader; no fixed version is listed yet.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.27% · 18th percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 19/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
The out-of-bounds write in the device's bootloader download module can corrupt memory, crash the system, or allow arbitrary code execution. An attacker with physical access can trigger it without logging in or needing any extra privileges.
Read the original description
In the bootloader download module, there is a possible out-of-bounds write. This could lead to heap memory corruption, system crash, or arbitrary code execution.
What to do
Check whether your setup matches what the bug needs.
Affected Unisoc chipsets: SC9863A, SC9832E, SC7731E, T310, T610, T618, T7200, T7225, T7250, T7255, T7280, T8100, T9100, T8200, T7300, T8300. The bug occurs during firmware update sessions, where a global offset variable is not reset.Workaround: No workaround is listed in the facts. The source offers no documented mitigation until a fix is published.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
1 day - Record last updated
Affected versions
- Unisoc (Shanghai) Technologies Co., Ltd. Bootloader
SC9863A, SC9832E, SC7731E, T310, T610, T618, T7200, T7225, T7250, T7255, T7280, T8100, T9100, T8200, T7300, T8300
Evidence 2
- Link
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-80335
Is CVE-2026-80335 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
A global offset variable is not reset during firmware update sessions, which leads to an out-of-bounds write. The advisory says this could cause heap memory corruption, a system crash, or potential arbitrary code execution without extra privileges.Source: unisoc.com
Which versions are affected by CVE-2026-80335?
Bootloader: versions SC9863A, SC9832E, SC7731E, T310, T610 and 11 more.Source: cve.now feed data
Am I affected, and how do I check?
The advisory lists these Unisoc chipsets: SC9863A, SC9832E, SC7731E, T310, T610, T618, T7200, T7225, T7250, T7255, T7280, T8100, T9100, T8200, T7300 and T8300. The bug occurs during firmware update sessions, so a reader can check their chipset model against this list.Source: unisoc.com
How do I fix CVE-2026-80335?
The facts name no fixed version or patch, so no upgrade target can be given. Check the device maker or Unisoc for an updated bootloader.Source: unisoc.com
What if there's no patch?
No workaround is listed in the facts. The source offers no documented mitigation until a fix is published.Source: unisoc.com