Input: touchwin - reset the packet index on every complete packet
Published Jul 25, 2026
7.8
HIGHCVSS 3.1
EPSS 0.17%
Description
tw_interrupt() accumulates each non-zero serial byte into a fixed three-byte buffer with a running index that is only reset once a full packet has been received *and* the device's two Y bytes agree:
tw->data[tw->idx++] = data; if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) { ... tw->idx = 0; }
The reset is gated on tw->data[1] == tw->data[2], a value the device controls. A malicious, malfunctioning or counterfeit Touchwindow peripheral can stream non-zero bytes whose 2nd and 3rd bytes differ: the index reaches TW_LENGTH without the equality holding, is never reset, and keeps growing, so tw->data[tw->idx++] walks off the end of the three-byte array and the rest of the heap-allocated struct tw, one attacker-chosen byte at a time -- an unbounded, device-driven heap out-of-bounds write.
Reset the index on every completed packet and report an event only when the two Y bytes match, like the other serio touchscreen drivers do.
Affected products
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- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version
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- Version 2.6.19StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<2.6.19
- Version 5.10.261StatusunaffectedConstraints<=5.10.*
- Version 5.15.212StatusunaffectedConstraints<=5.15.*
- Version 6.1.178StatusunaffectedConstraints<=6.1.*
- Version 6.12.96StatusunaffectedConstraints<=6.12.*
- Version 6.18.39StatusunaffectedConstraints<=6.18.*
- Version 6.6.145StatusunaffectedConstraints<=6.6.*
- Version 7.1.4StatusunaffectedConstraints<=7.1.*
- Version 7.2StatusunaffectedConstraints<=*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
| |||||||||||||||||||||||||||||||||
| Linux | Linux | affected |
|
- ≥ 2.6.19 · < 5.10.261
- ≥ 5.11 · < 5.15.212
- ≥ 5.16 · < 6.1.178
- ≥ 6.2 · < 6.6.145
- ≥ 6.7 · < 6.12.96
- ≥ 6.13 · < 6.18.39
- ≥ 6.19 · < 7.1.4
No data.
Red Hat Enterprise Linux 10
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise Linux 9
kernel
Not affected
Red Hat Enterprise Linux 9
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
References (14)
- https://access.redhat.com/security/cve/CVE-2026-64271 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2507225 Issue Tracking
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-48983 Advisory
- https://git.kernel.org/stable/c/044167cba2384bcd783547ad5e30ecd292b30919 Patch
- https://git.kernel.org/stable/c/3e6f007b43e2fc6546e21fa74ee62c38984a6672 Patch
- https://git.kernel.org/stable/c/431ad239f2924dff337c3fccb9246597c1b63185 Patch
- https://git.kernel.org/stable/c/478cdd736f2ce3114f90e775d7358136d3977b94 Patch
- https://git.kernel.org/stable/c/6c9f29f128dd4057404838259af4c645318487e1 Patch
- https://git.kernel.org/stable/c/70e4248793762df9832fd4fc2fc6ac7924572c36 Patch
- https://git.kernel.org/stable/c/a8d87184576c889759e3aab899799a482f1e1a5b Patch
- https://git.kernel.org/stable/c/ed9b66905407eb3d02df1aaeed82eb7a7f0eb508 Patch
- https://lore.kernel.org/linux-cve-announce/2026072559-CVE-2026-64271-b6b4@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2026-64271
- https://www.cve.org/CVERecord?id=CVE-2026-64271
Change history (0)
No recorded changes yet.