fbdev: vfb: defer cleanup until the last reference
In the Linux kernel, the following vulnerability has been resolved: fbdev: vfb: defer cleanup until the last reference FBIOGETCMAP takes a shallow snapshot of info->cmap and performs the usercopy after dropping info->lock. vfb_remove() frees the colormap immediately after unregistering the framebuffer, even when an open file still holds a reference to fb_info. A concurrent driver unbind can therefore free the colormap while the ioctl copies it to userspace. KASAN reports: BUG: KASAN: slab-use-after-free in _copy_to_user Read of size 512 by task poc/125 _copy_to_user (./include/linux/instrumented.h:129 ./include/linux/uaccess.h:201 lib/usercopy.c:24) fb_cmap_to_user (./include/linux/uaccess.h:230 drivers/video/fbdev/core/fbcmap.c:211) do_fb_ioctl (drivers/video/fbdev/core/fb_chrdev.c:114) Allocated by task 1: fb_alloc_cmap_gfp (./include/linux/slab.h:973 ./include/linux/slab.h:1290 drivers/video/fbdev/core/fbcmap.c:108) vfb_probe (drivers/video/fbdev/vfb.c:459) Freed by task 124: fb_dealloc_cmap (drivers/video/fbdev/core/fbcmap.c:151) vfb_remove (drivers/video/fbdev/vfb.c:489) unregister_framebuffer() drops the registration reference, and fbdev calls fb_destroy after the last put_fb_info(). Move the registered framebuffer's cleanup into an fb_destroy callback so its colormap and screen buffer stay alive until all file references have been released.
CVE-2026-97604
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-97604
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
"lessThan": "bf49eac7ed11aabd0b9b790c062742a8e4be97c6",
"versionType": "git"
},
{
"status": "affected",
"version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
"lessThan": "040ce3950f64a11e9ee5646c8aaa91fd2e29e245",
"versionType": "git"
},
{
"status": "affected",
"version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
"lessThan": "ab664e279eb2a68e55895dd115a9488807280f07",
"versionType": "git"
},
{
"status": "affected",
"version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
"lessThan": "de5a0eda59fe4b3eacd1a67c992e54766bb6683f",
"versionType": "git"
},
{
"status": "affected",
"version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
"lessThan": "86356f13598f59f5acb1754895747dcdaf65a254",
"versionType": "git"
},
{
"status": "affected",
"version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
"lessThan": "5ff1effb047e465cde193d7df95988aa1520035e",
"versionType": "git"
},
{
"status": "affected",
"version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
"lessThan": "3c91e51a53cf805e551e5dc8149cd0539a6dbb9d",
"versionType": "git"
},
{
"status": "affected",
"version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
"lessThan": "a0a34a40ed299c9c7cff6af163a5b883ee9d6d73",
"versionType": "git"
}
],
"programFiles": [
"drivers/video/fbdev/vfb.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.30"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.30",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/video/fbdev/vfb.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97604
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38046 · Revision 1
- Added to Heist Feed
- Publisher date