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CVE-2026-99203— pipe: preserve existing fasync readers on writer setup failure

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，以下漏洞已被修复： pipe：在写入端设置失败时保留现有的异步读取者 和 决定了在 获取 之前是否调用 。因此，对同一个 命名管道的两次异步启用操作，可能都会进入该回调函数。 会在检查是否已存在条目之前进行内存分配。如果第一次启用操作同时安装了读取端和写入端两个条目，那么第二次启用操作可能会更新读取端条目，随后在分配写入端条目时失败。错误处理路径会移除预先存在的读取端条目，从而清除 标志，而写入端条目仍保持注册状态。随后， 会跳过 调用，导致后续的管道通知在 中解引用已被释放的文件对象或其

AI Predicted 8.8 Difficulty: Moderate

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 76398425bb06b07cc3a3b1ce169c67dc9d6874ed< 4c42ce499ce4b1c787e61082e3b13df4f30c4eaa affected
76398425bb06b07cc3a3b1ce169c67dc9d6874ed< 2259809e5b7043c4ba20af7b14ba3e471cf55521 affected
76398425bb06b07cc3a3b1ce169c67dc9d6874ed< 40bb03d3ea6f6a915218508819ecc4d7a7fa260d affected
2.6.30 affected
< 2.6.30 unaffected
6.18.59≤ 6.18.* unaffected
7.2.13≤ 7.2.* unaffected
7.3≤ * unaffected
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I. Basic Information for CVE-2026-99203

Vulnerability Information
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Vulnerability Title
pipe: preserve existing fasync readers on writer setup failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: pipe: preserve existing fasync readers on writer setup failure F_SETFL and FIOASYNC decide whether to invoke ->fasync() before pipe_fasync() takes pipe->mutex. Two enables of one O_RDWR FIFO can therefore both enter the callback. fasync_helper() allocates before checking for an existing entry. If the first enable installs both entries, a second enable can update the reader entry and then fail the allocation for the writer entry. The error path removes the pre-existing reader entry, clearing FASYNC while the writer entry remains registered. __fput() then skips ->fasync(), so a later pipe notification can dereference the freed file or its f_owner. An unprivileged memory-pressure reproducer triggers a KASAN slab-use-after-free in send_sigio() through this path. Keep the reader helper's result and undo the registration only if this call added it. The pipe mutex serializes changes to both lists, so a failed new registration still removes its reader, while a failed duplicate preserves the existing registrations and FASYNC. Successful duplicate enables continue to update fa_fd as before.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 76398425bb06b07cc3a3b1ce169c67dc9d6874ed ~ 4c42ce499ce4b1c787e61082e3b13df4f30c4eaa -
Linux Linux 2.6.30 -

II. Public POCs for CVE-2026-99203

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III. Intelligence Information for CVE-2026-99203

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Patches & Fixes for CVE-2026-99203 (3)

Same Patch Batch · Linux · 2026-10-28 · 117 CVEs total

CVE-2026-99143 tracing: Keep the predicate limit separate from program capacity
CVE-2026-99129 selinux: fix BPF token permission checks
CVE-2026-99130 io_uring/cancel: don't spin on local work the task can't run
CVE-2026-99131 xfs: fix capability check in xfs
CVE-2026-99133 net/iucv: fix the recvmsg window update
CVE-2026-99132 xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf
CVE-2026-99134 mac802154: fix data race and NULL deref on local->assoc_dev
CVE-2026-99135 dm-integrity: fix infinite loop on discard with large tag size
CVE-2026-99137 cifs: don't update i_size in cifs_do_truncate without a cached handle
CVE-2026-99136 dm-crypt: fix a tiny race condition in crypt_dec_pending
CVE-2026-99138 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)
CVE-2026-99140 tracing: Fix hist trigger timestamps for buffered events
CVE-2026-99139 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CONGESTION)
CVE-2026-99141 tracing: Fix crash in print_graph_function_event()
CVE-2026-99142 tracing: Check operator stack capacity before pushing
CVE-2026-99154 scsi: libiscsi: Reject a negative task index from parse_pdu_itt
CVE-2026-99151 drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions
CVE-2026-99153 scsi: libiscsi: Validate the ITT reflected in a Reject PDU
CVE-2026-99152 scsi: libiscsi: Validate the task named by a management response
CVE-2026-99150 drm/amdgpu: don't drop the runtime PM reference twice in amdgpu_gpr

Showing top 20 of 117 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux