liveupdate: Remember FLB retrieve() status

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-92483
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:50 UTC
Updated2026-09-17 17:17:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: liveupdate: Remember FLB retrieve() status LUO keeps track of successful retrieve attempts on an FLB. It does so to avoid multiple retrievals of the same FLB. Multiple retrievals cause problems because once the FLB is retrieved, the serialized data structures are likely freed and the FLB is likely in a very different state from what the code expects. All this works well when retrieve succeeds. When it fails, luo_flb_retrieve_one() returns the error immediately, without ever storing anywhere that a retrieve was attempted or what its error code was. If the user attempts to retrieve another file registered with the same FLB, LUO will attempt to call the FLB's retrieve() callback again. The retry is problematic for much of the same reasons listed above. The FLB is likely in a very different state than what the retrieve logic normally expects (e.g. some KHO pages may have already been restored and freed). There is no sane way of attempting the retrieve again. Remember the error retrieve returned and directly return it on a retry. This is done by changing the retrieved bool to a retrieve_status integer. A value of 0 means retrieve was never attempted, a positive value means it succeeded, and a negative value means it failed and the error code is the value. This is similar to commit f85b1c6af5bc ("liveupdate: luo_file: remember retrieve() status") which did the same for LUO files.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cab056f2aae7250af50e503b81a80dfc567a1acd 908f3ea3f050b865c5c2d8c1da566185a4a3efc0 git Not specified
CNA Linux Linux affected cab056f2aae7250af50e503b81a80dfc567a1acd 5c4a03afcb21783987ffc64562b76ddd5a21b12b git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5c4a03afcb21783987ffc64562b76ddd5a21b12b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/908f3ea3f050b865c5c2d8c1da566185a4a3efc0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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