CVE-2026-99056
Received
Received - Intake
Race Condition in Linux Kernel STRParser
Vulnerability report for CVE-2026-99056, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-23
Last updated on: 2026-10-23
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
strparser: make sure __strp_recv isn't running before tearing down the parser
The comment above strp_done() claims that if strp is stopped,
strp_recv will no longer be called. That's only true if the caller has
a mechanism (eg locking) to guarantee that strp_recv() calls that
started before strp_stop() have completed by the time we call
strp_done().
This adds a dummy lock_sock/release_sock pair to guarantee that any
in-flight strp_recv() (which runs under either bh_lock_sock or
lock_sock, depending if it's called from ->sk_data_ready or strp_work)
has completed.
Only espintcp can be affected by this race condition, but this patch
makes sure no future user of strp can have the bug.
This could crash on strp->sk ("general mode" of strp), but this mode
has been here for 9 years and has never been used. It'll be gone soon,
no point worrying about it.
Switch the stopped/paused/etc bits to u8's to avoid races between
strp_stop() and strp_pause/unpause().
A reproducer has been published and turns the possible UAF into an
exploit [1].
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 |
| Linux | Linux | e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 |
| Linux | Linux | e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 |
| Linux | Linux | e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 |
| Linux | Linux | e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 |
| Linux | Linux | 5.6 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
