tracing: Save the event file instead of the compatible histogram

Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Save the event file instead of the compatible histogram create_field_var_hist() creates a histogram on the matched event to supply a field variable, and records it on the target so it can be torn down later: hist_data = find_compatible_hist(target_hist_data, file); ... /* Save the compatible histogram information */ var_hist->hist_data = hist_data; hist_data is not the histogram it creates. It is one that was already there, whose keys the new one copies. The saved pointer has a single user, unregister_field_var_hists(), which runs when the target is removed: file = hist_data->field_var_hists[i]->hist_data->event_file; find_compatible_hist() matches on keys alone, so it can pick one with no variables of its own. check_var_refs() then returns false and the user can remove it while the target still points at it: BUG: KASAN: slab-use-after-free in event_hist_trigger_free+0x2b2/0x320 Read of size 8 at addr ffff8880093b90e0 by task init/1 Freed by task 1: kfree+0x154/0x420 event_hist_trigger_free+0x1d5/0x320 event_hist_trigger_parse+0x35f3/0x69e0 trigger_process_regex+0x1a6/0x250 Save the event file instead. It is all the dereference ever wanted, and it does not go away when the user removes a trigger.

Scores

EPSS (exploitation in 30 days)

Not scored

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Affected products

• Linux · Linux

  • affected 02205a6752f223779a1b0e9e8ffacbea6e717851 – < a6165126b1a1b26342b55be6eb6ee23af8756aba
  • affected 02205a6752f223779a1b0e9e8ffacbea6e717851 – < 173914501b97236d7ea7dc2af7f30feddd4e1436
  • affected 02205a6752f223779a1b0e9e8ffacbea6e717851 – < ac815a379644b2ad5008a009a3516ada31b5dd82
  • affected 02205a6752f223779a1b0e9e8ffacbea6e717851 – < 8b307d64a60548e4a74cb746f74d7ed4bd49965e
  • affected 02205a6752f223779a1b0e9e8ffacbea6e717851 – < 7a111ba0d1b74c99bc8f096565dc71945f694254
  • affected 02205a6752f223779a1b0e9e8ffacbea6e717851 – < 3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea
  • affected 02205a6752f223779a1b0e9e8ffacbea6e717851 – < 9631dbccd3c649b567a5aafffea6b00634183997
  • affected 02205a6752f223779a1b0e9e8ffacbea6e717851 – < 7cafc82e6153f05a221be678cd649d02e06ba909

• Linux · Linux

  • affected 4.17
  • unaffected < 4.17
  • unaffected 5.10.273 – ≤ 5.10.*
  • unaffected 5.15.224 – ≤ 5.15.*
  • unaffected 6.1.191 – ≤ 6.1.*
  • unaffected 6.6.161 – ≤ 6.6.*
  • unaffected 6.12.115 – ≤ 6.12.*
  • unaffected 6.18.60 – ≤ 6.18.*
  • unaffected 7.2.14 – ≤ 7.2.*
  • unaffected 7.3.1 – ≤ 7.3.*

References (8)

• https://git.kernel.org/stable/c/a6165126b1a1b26342b55be6eb6ee23af8756aba (opens in a new tab)
• https://git.kernel.org/stable/c/173914501b97236d7ea7dc2af7f30feddd4e1436 (opens in a new tab)
• https://git.kernel.org/stable/c/ac815a379644b2ad5008a009a3516ada31b5dd82 (opens in a new tab)
• https://git.kernel.org/stable/c/8b307d64a60548e4a74cb746f74d7ed4bd49965e (opens in a new tab)
• https://git.kernel.org/stable/c/7a111ba0d1b74c99bc8f096565dc71945f694254 (opens in a new tab)
• https://git.kernel.org/stable/c/3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea (opens in a new tab)
• https://git.kernel.org/stable/c/9631dbccd3c649b567a5aafffea6b00634183997 (opens in a new tab)
• https://git.kernel.org/stable/c/7cafc82e6153f05a221be678cd649d02e06ba909 (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Record last updated 2 Nov 2026, 16:06 UTC.