Answer in brief
CVE-2026-64574 records a Unknown severity vulnerability in wifi: mac80211: tear down new links on vif update error path. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <329589417214d3b7221432e5b266ed2bba7ff674 || >=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <c57d97f381306bbfba174e8f708419e007824e0c || >=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <0f7eaeb950adb77f71beb546e5ab30f90b41fe6f || >=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <901a73523e093beff123b54b1ceaf3113f18acc9 || >=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <952c02b33f56207a160421bcd61e7ac53c9c59ae | 329589417214d3b7221432e5b266ed2bba7ff674, c57d97f381306bbfba174e8f708419e007824e0c, 0f7eaeb950adb77f71beb546e5ab30f90b41fe6f, 901a73523e093beff123b54b1ceaf3113f18acc9, 952c02b33f56207a160421bcd61e7ac53c9c59ae |
| Linux/Linuxgeneric | 6.4 | Not reported |
Published upstream
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: tear down new links on vif update error path When ieee80211_vif_update_links() adds new links it allocates a link container for each and calls ieee80211_link_init() (which registers the per-link debugfs files with file->private_data pointing into the container) and ieee80211_link_setup(). If the subsequent drv_change_vif_links() fails, the error path restores the old pointers and jumps to 'free', which frees the new containers but never removes their debugfs entries or stops the links. The debugfs files survive with file->private_data dangling at the freed container, so a later open()+read() (e.g. link-1/txpower) dereferences freed memory in ieee80211_if_read_link(), a use-after-free. The removal path already dismantles links correctly via ieee80211_tear_down_links(), which removes each link's keys and debugfs entries and calls ieee80211_link_stop(); the add path on the error branch does not. Commit be1ba9ed221f ("wifi: mac80211: avoid weird state in error path") hardened this same error path for the link-removal case (new_links == 0) but left the newly-added links' teardown unaddressed. drv_change_vif_links() can fail at runtime on MLO drivers (internal allocation / queue / firmware command failures). Remove the new links' debugfs entries and stop them before freeing. BUG: KASAN: slab-use-after-free in ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127) Read of size 8 at addr ffff888011290000 by task exploit/145 Call Trace: ... ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127) short_proxy_read (fs/debugfs/file.c:373) vfs_read (fs/read_write.c:572) ksys_read (fs/read_write.c:716) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) ... Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a RIP: 0010:ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127) Kernel panic - not syncing: Fatal exception
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64574 records a Unknown severity vulnerability in wifi: mac80211: tear down new links on vif update error path. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <329589417214d3b7221432e5b266ed2bba7ff674 || >=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <c57d97f381306bbfba174e8f708419e007824e0c || >=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <0f7eaeb950adb77f71beb546e5ab30f90b41fe6f || >=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <901a73523e093beff123b54b1ceaf3113f18acc9 || >=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <952c02b33f56207a160421bcd61e7ac53c9c59ae | 329589417214d3b7221432e5b266ed2bba7ff674, c57d97f381306bbfba174e8f708419e007824e0c, 0f7eaeb950adb77f71beb546e5ab30f90b41fe6f, 901a73523e093beff123b54b1ceaf3113f18acc9, 952c02b33f56207a160421bcd61e7ac53c9c59ae |
| Linux/Linuxgeneric | 6.4 | Not reported |
Published upstream
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: tear down new links on vif update error path When ieee80211_vif_update_links() adds new links it allocates a link container for each and calls ieee80211_link_init() (which registers the per-link debugfs files with file->private_data pointing into the container) and ieee80211_link_setup(). If the subsequent drv_change_vif_links() fails, the error path restores the old pointers and jumps to 'free', which frees the new containers but never removes their debugfs entries or stops the links. The debugfs files survive with file->private_data dangling at the freed container, so a later open()+read() (e.g. link-1/txpower) dereferences freed memory in ieee80211_if_read_link(), a use-after-free. The removal path already dismantles links correctly via ieee80211_tear_down_links(), which removes each link's keys and debugfs entries and calls ieee80211_link_stop(); the add path on the error branch does not. Commit be1ba9ed221f ("wifi: mac80211: avoid weird state in error path") hardened this same error path for the link-removal case (new_links == 0) but left the newly-added links' teardown unaddressed. drv_change_vif_links() can fail at runtime on MLO drivers (internal allocation / queue / firmware command failures). Remove the new links' debugfs entries and stop them before freeing. BUG: KASAN: slab-use-after-free in ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127) Read of size 8 at addr ffff888011290000 by task exploit/145 Call Trace: ... ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127) short_proxy_read (fs/debugfs/file.c:373) vfs_read (fs/read_write.c:572) ksys_read (fs/read_write.c:716) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) ... Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a RIP: 0010:ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127) Kernel panic - not syncing: Fatal exception
Quoted source text, attributed separately from HOL analysis.