CVE-2026-99233
tracing/histograms: Verify event_call identity when updating synth_event refcount
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: tracing/histograms: Verify event_call identity when updating synth_event refcount In event_hist_trigger_parse() and hist_unreg_all(), the histogram registration and unregistration paths look up find_synth_event() using trace_event_name(file->event_call) and adjust se->ref if a match is found. Because find_synth_event() only compares the event basename, registering or removing a histogram on a non-synthetic trace event whose basename matches a synthetic event erroneously modifies the synthetic event's reference count. If a histogram is registered on the non-synthetic event before the synthetic event is created and removed afterwards, se->ref is decremented without a matching increment, allowing the synthetic event to be freed while an active histogram action still holds a pointer to it. Introduce find_synth_event_call() to verify that &se->call matches file->event_call before adjusting se->ref.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- 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 4b147936fa509650beaf638b331573c23ba4d609 – < 381f543ed35c434d5b707369aa5dcd69ecf440af
- affected 4b147936fa509650beaf638b331573c23ba4d609 – < 4472579bd1c83708b6fe623c870cdf728e947205
- affected 4b147936fa509650beaf638b331573c23ba4d609 – < 23b4106e8b35823acc79e206c7745f55b9cfd78b
- affected 4b147936fa509650beaf638b331573c23ba4d609 – < 06e816bed499fe47f39f12044382cc5d064485fb
- affected 4b147936fa509650beaf638b331573c23ba4d609 – < 5597bb8db6855fcb97a67196d227fea359bcd81c
- affected 4b147936fa509650beaf638b331573c23ba4d609 – < cf4e31d5da80fae4c9cdbe7af55b7c3ad213f0e4
Linux · Linux
- affected 4.17
- unaffected < 4.17
- 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 (6)
- https://git.kernel.org/stable/c/381f543ed35c434d5b707369aa5dcd69ecf440af (opens in a new tab)
- https://git.kernel.org/stable/c/4472579bd1c83708b6fe623c870cdf728e947205 (opens in a new tab)
- https://git.kernel.org/stable/c/23b4106e8b35823acc79e206c7745f55b9cfd78b (opens in a new tab)
- https://git.kernel.org/stable/c/06e816bed499fe47f39f12044382cc5d064485fb (opens in a new tab)
- https://git.kernel.org/stable/c/5597bb8db6855fcb97a67196d227fea359bcd81c (opens in a new tab)
- https://git.kernel.org/stable/c/cf4e31d5da80fae4c9cdbe7af55b7c3ad213f0e4 (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 .