CVE-2026-99056 is a vulnerability in Linux Kernel
Published on October 23, 2026
strparser: make sure __strp_recv isn't running before tearing down the parser
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].
Products Associated with CVE-2026-99056
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Affected Versions
Linux:- Version e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and below a18dd388045dc7263d99a07db9de4e0f149ca8f1 is affected.
- Version e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and below 9f3e9fe1b155e9b4572054d8d140586bc3512ecf is affected.
- Version e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and below d2b5f637b9b67a79a50d42614d10653c13b4e449 is affected.
- Version e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and below eaa3a29004c063d7e9d5ea55636f693f67e6db0f is affected.
- Version e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and below 0984ebc631792acf8fff105112ee74a6b8f1efcc is affected.
- Version 5.6 is affected.
- Before 5.6 is unaffected.
- Version 6.6.160, <= 6.6.* is unaffected.
- Version 6.12.113, <= 6.12.* is unaffected.
- Version 6.18.57, <= 6.18.* is unaffected.
- Version 7.2.11, <= 7.2.* is unaffected.
- Version 7.3, <= * is unaffected.