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CVE-2026-99037— dm-crypt: reject the lmk IV mode with AEAD ciphers

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：拒绝在 AEAD 加密算法中使用 lmk IV 模式 当配置表中的"capi:"行将 AEAD 加密算法与 lmk IV 模式配对时（例如使用 选项的 ），加载该配置会导致系统发生 oops（内核崩溃）。原因是 lmk 模式将 设置为 64，但 函数仅为 AEAD 分配了一个变换（transform）结构。因此， 函数在访问 数组时会越界读取，并尝试对读取到的非法值调用 。 lmk 模式的存在是为了兼容使用 CBC 加密的 Loop-AES。为了避免为

AI Predicted 4.4 Difficulty: Hard EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 33d2f09fcb357fd1861c4959d1d3505492bf91f8< 9a0dab8a9d9975dec14a118b55cae2517aea5ca9 affected
33d2f09fcb357fd1861c4959d1d3505492bf91f8< 962ce265fbf5d87afeb78cf19c12e083ab0ffeb8 affected
33d2f09fcb357fd1861c4959d1d3505492bf91f8< a1a875614dae43b43d311bb9e7a7a70eed78efe6 affected
33d2f09fcb357fd1861c4959d1d3505492bf91f8< 40ea7dfa8cd5f9aed72a55c9ca3008aee5880e6f affected
33d2f09fcb357fd1861c4959d1d3505492bf91f8< 3195e0daf590683992edb4eed32269e569e04924 affected
4.12 affected
< 4.12 unaffected
6.6.160≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-99037

Vulnerability Information
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Vulnerability Title
dm-crypt: reject the lmk IV mode with AEAD ciphers
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm-crypt: reject the lmk IV mode with AEAD ciphers A "capi:" table line that pairs an AEAD cipher with the lmk IV mode, for example "capi:gcm(aes)-lmk" with the integrity:28:aead option, causes an oops when it is loaded. lmk sets tfms_count to 64, but crypt_alloc_tfms_aead only allocates one transform, so crypt_setkey reads past the end of the tfms_aead array and calls crypto_aead_setkey on the values it finds there. lmk exists for compatibility with Loop-AES, which uses CBC, so refuse it with an AEAD cipher rather than allocate 64 AEAD transforms. The check cannot go in crypt_iv_lmk_ctr with the other lmk checks, because the IV constructor runs after crypt_set_key. Note that this is not a security bug because the memory corruption can only be triggered by root.
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 33d2f09fcb357fd1861c4959d1d3505492bf91f8 ~ 9a0dab8a9d9975dec14a118b55cae2517aea5ca9 -
Linux Linux 4.12 -

II. Public POCs for CVE-2026-99037

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III. Intelligence Information for CVE-2026-99037

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Patches & Fixes for CVE-2026-99037 (4)

Same Patch Batch · Linux · 2026-10-23 · 217 CVEs total

CVE-2026-98959 9.8 CRITICAL btrfs: fix xattr replace when multiple xattrs are packed in the same item
CVE-2026-99078 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry
CVE-2026-99079 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on refill retry
CVE-2026-98988 8.8 HIGH namespace: keep covered mounts covered in OPEN_TREE_NAMESPACE
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-2026-98980 8.8 HIGH namei: don't reveal overmounted entries in refwalk
CVE-2026-98870 8.8 HIGH ksmbd: remove stale channels from all sessions on teardown
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-2026-98968 8.1 HIGH amt: send the relay's General Query directly from the receive path
CVE-2026-99064 8.1 HIGH cipso: adjust cached option offsets when removing CIPSO
CVE-2026-99014 7.8 HIGH Bluetooth: hci_sync: Fix command skb lifetime during scan setup
CVE-2026-98999 7.8 HIGH drm/xe: Fix stale pinned_link entry when fb-pin performs the final unpin
CVE-2026-99016 7.8 HIGH riscv: futex: untag the user pointer before the atomic access
CVE-2026-99018 7.8 HIGH riscv: entry: gate shadow call stack reload on sstatus.SPP, not tp
CVE-2026-99051 7.8 HIGH fsverity: RCU-delay the freeing of struct fsverity_info
CVE-2026-99054 7.8 HIGH tipc: destroy topsrv workqueues before closing connections
CVE-2026-99053 7.8 HIGH tipc: hold a reference to nodes found by link name

Showing top 20 of 217 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux