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CVE-2026-99056— strparser: make sure __strp_recv isn't running before tearing down the parser

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： strparser：在拆除解析器之前，确保 不再运行。 上方的注释声称：一旦 停止， 将不再被调用。然而，这一说法仅在当前调用者具备某种机制（例如加锁）来保证在调用 时，所有在 之前启动的 调用均已执行完毕的情况下才成立。 本补丁通过引入一个虚拟的 / 锁对，来确保任何正在执行的 （其运行依赖于 或 ，具体取决于它是从 还是 调用）都已完成。 虽然只有 可能受到此竞态条件的影响，但该补丁确保了未来任何使用 的代码都不会出现此漏洞。 该漏洞可能导致在 上发生崩溃（即 的“

CVSS 7.8 · High EPSS 0.21% · P10

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< a18dd388045dc7263d99a07db9de4e0f149ca8f1 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 9f3e9fe1b155e9b4572054d8d140586bc3512ecf affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< d2b5f637b9b67a79a50d42614d10653c13b4e449 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< eaa3a29004c063d7e9d5ea55636f693f67e6db0f affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 0984ebc631792acf8fff105112ee74a6b8f1efcc affected
5.6 affected
< 5.6 unaffected
6.6.160≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-99056

Vulnerability Information
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Vulnerability Title
strparser: make sure __strp_recv isn't running before tearing down the parser
Source: CVE Program / CVE List V5
Vulnerability 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].
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 ~ a18dd388045dc7263d99a07db9de4e0f149ca8f1 -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-99056

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III. Intelligence Information for CVE-2026-99056

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Patches & Fixes for CVE-2026-99056 (5)

Same Patch Batch · Linux · 2026-10-23 · 218 CVEs total

CVE-2026-98959 9.8 CRITICAL btrfs: fix xattr replace when multiple xattrs are packed in the same item
CVE-2026-99079 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on refill retry
CVE-2026-99078 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry
CVE-2026-98870 8.8 HIGH ksmbd: remove stale channels from all sessions on teardown
CVE-2026-98980 8.8 HIGH namei: don't reveal overmounted entries in refwalk
CVE-2026-99083 8.8 HIGH ksmbd: fix heap out-of-bounds write in krb5_authenticate()
CVE-2026-99082 8.8 HIGH KVM: x86: Use active memslots for the per-vCPU MMIO cache
CVE-2026-98981 8.8 HIGH namespace: unhash a dentry before detaching the mounts on it
CVE-2026-98988 8.8 HIGH namespace: keep covered mounts covered in OPEN_TREE_NAMESPACE
CVE-2026-98978 8.4 HIGH namespace: never expire a locked mount
CVE-2026-99042 8.4 HIGH io_uring/net: populate CONNECT filter fields for 24-byte sockaddr_in6
CVE-2026-99064 8.1 HIGH cipso: adjust cached option offsets when removing CIPSO
CVE-2026-98968 8.1 HIGH amt: send the relay's General Query directly from the receive path
CVE-2026-98975 7.8 HIGH xfs: stop exchanging reflink flags when exchanging mappings
CVE-2026-98889 7.8 HIGH wifi: iwlwifi: mvm: fix sched scan IE sizing
CVE-2026-99050 7.8 HIGH gpio: mpsse: fix race when arming the IRQ poll worker
CVE-2026-99054 7.8 HIGH tipc: destroy topsrv workqueues before closing connections
CVE-2026-98999 7.8 HIGH drm/xe: Fix stale pinned_link entry when fb-pin performs the final unpin
CVE-2026-98974 7.8 HIGH xfs: fix exchange-range-to-eof file size exchange
CVE-2026-98976 7.8 HIGH namespace: keep the lock on a mount that a propagated copy is moved beneath

Showing top 20 of 218 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux