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CVE-2026-99136— dm-crypt: fix a tiny race condition in crypt_dec_pending

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： dm-crypt：修复 crypt_dec_pending 中一个微小的竞态条件 crypt_dec_pending 在调用 atomic_dec_and_test 之前读取了 io->error。此时，另一个执行上下文（例如由中断调用的 crypt_endio）可能在读取与递减操作之间设置 io->error 并释放其引用。随后，crypt_dec_pending 会释放最后一个引用，并以过期的状态完成 bio 请求——导致原本失败且从未被解密的读取操作，或失败的写入

AI Predicted 5.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1069.006

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux b35f8caa0890169000fec22902290d9a15274cbd< ac5d887ab93592fc5e3605fe30c1d8d232d609b3 affected
b35f8caa0890169000fec22902290d9a15274cbd< 4f16bb982b27b9f5a15301f622c318001fe521f8 affected
b35f8caa0890169000fec22902290d9a15274cbd< 148845aa1921d95ef5dc851c76e6a284f6657df6 affected
9c8f3fcd3ffd3283cc0971c8919058356f20a963 affected
2.6.28.9< 2.6.29 affected
2.6.29 affected
< 2.6.29 unaffected
6.18.59≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-99136

Vulnerability Information
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Vulnerability Title
dm-crypt: fix a tiny race condition in crypt_dec_pending
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm-crypt: fix a tiny race condition in crypt_dec_pending crypt_dec_pending reads io->error before calling atomic_dec_and_test. Another context, for example crypt_endio called from an interrupt, may set io->error and drop its reference between the read and the decrement. crypt_dec_pending then drops the last reference and completes the bio with the stale status - so a read that failed and was never decrypted, or a write that failed, is reported as successful. The read was placed before the decrement by commit b35f8caa0890 ("dm crypt: wait for endio to complete before destruction"), because that commit freed dm_crypt_io before calling bio_endio. This is no longer the case, dm_crypt_io lives in the per-bio data now. Read io->error after atomic_dec_and_test instead. atomic_dec_and_test is fully ordered, so no additional barrier is needed.
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 b35f8caa0890169000fec22902290d9a15274cbd ~ ac5d887ab93592fc5e3605fe30c1d8d232d609b3 -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2026-99136

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III. Intelligence Information for CVE-2026-99136

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Patches & Fixes for CVE-2026-99136 (3)

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

CVE-2026-99144 sched_ext: Fix use-after-free of a destroyed user DSQ by a deferred reenqueue
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-2026-99138 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-2026-99143 tracing: Keep the predicate limit separate from program capacity
CVE-2026-99156 scsi: st: Fix use-after-free race between st_remove() and st_open()
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-2026-99154 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

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux