ieee802154: ca8210: fix pointer truncation in kfifo on 64-bit
Summary
| CVE | CVE-2026-72047 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-15 06:21:13 UTC |
| Updated | 2026-08-15 06:21:13 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: ieee802154: ca8210: fix pointer truncation in kfifo on 64-bit ca8210_test_int_driver_write() and ca8210_test_int_user_read() exchange a kmalloc'd buffer pointer through a struct kfifo, but pass a literal '4' as the byte count to kfifo_in()/kfifo_out(). This is correct on 32-bit (pointer = 4 bytes), but on 64-bit only the low 4 bytes of the 8-byte pointer are written into the FIFO. The reader then reads back 4 bytes into an 8-byte local pointer variable, leaving the upper 4 bytes uninitialized stack data. The first dereference of the reconstructed pointer (fifo_buffer[1]) accesses an arbitrary kernel address and generally results in an oops. Use sizeof(fifo_buffer) so the byte count matches pointer width on every architecture. The driver has no architecture restriction in Kconfig, so any 64-bit build with CONFIG_IEEE802154_CA8210_DEBUGFS=y is exposed. Issue has been latent since the driver was added in 2017 because it is most commonly deployed on 32-bit MCUs. Found via a custom Coccinelle semantic patch hunting for short-byte kfifo I/O on byte-mode kfifos used to shuttle pointers. |
Risk And Classification
EPSS: 0.002100000 probability, percentile 0.115350000 (date 2026-08-15)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected ded845a781a578dfb0b5b2c138e5a067aa3b1242 2c1664ccfae653979b38788211240b5a1ee317ed git | Not specified |
| CNA | Linux | Linux | affected ded845a781a578dfb0b5b2c138e5a067aa3b1242 093aacb0c56d5c693e3169a0224062e77c3fd0c0 git | Not specified |
| CNA | Linux | Linux | affected ded845a781a578dfb0b5b2c138e5a067aa3b1242 87dab14a4f68895d6f4d798e6ee3556cd64e8c72 git | Not specified |
| CNA | Linux | Linux | affected ded845a781a578dfb0b5b2c138e5a067aa3b1242 1fe2643d0b24ca3cdd61a31a45c2d3233dc6cbfe git | Not specified |
| CNA | Linux | Linux | affected ded845a781a578dfb0b5b2c138e5a067aa3b1242 65dc342274a01616f5c17105f7360a3b4bfd7a3d git | Not specified |
| CNA | Linux | Linux | affected ded845a781a578dfb0b5b2c138e5a067aa3b1242 2059c28bd725beded01277cdf1f67be33e714323 git | Not specified |
| CNA | Linux | Linux | affected ded845a781a578dfb0b5b2c138e5a067aa3b1242 d8ce67fa6a5e6929f5414e933ff9665176c2bce6 git | Not specified |
| CNA | Linux | Linux | affected ded845a781a578dfb0b5b2c138e5a067aa3b1242 6d7f7bcf225b2d566176bf6229dbd1252940cb3c git | Not specified |
| CNA | Linux | Linux | affected 4.12 | Not specified |
| CNA | Linux | Linux | unaffected 4.12 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.261 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.212 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.178 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.145 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.97 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.40 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.5 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2-rc1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/093aacb0c56d5c693e3169a0224062e77c3fd0c0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/2c1664ccfae653979b38788211240b5a1ee317ed | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6d7f7bcf225b2d566176bf6229dbd1252940cb3c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d8ce67fa6a5e6929f5414e933ff9665176c2bce6 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1fe2643d0b24ca3cdd61a31a45c2d3233dc6cbfe | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/65dc342274a01616f5c17105f7360a3b4bfd7a3d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/87dab14a4f68895d6f4d798e6ee3556cd64e8c72 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/2059c28bd725beded01277cdf1f67be33e714323 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.