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CVE-2026-74671— ima: fix out-of-bounds read in xattr_verify()

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，已修复以下漏洞： ima: 修复 xattr_verify() 中的越界读取漏洞 函数中的摘要长度检查存在 与 类型混用的问题： 由于 返回 类型，在常规算术转换规则下，整个左侧表达式会在执行减法操作之前被提升为无符号 64 位整数。对于截断的 xattr 属性，这会导致下溢（underflow），而非得到负值：例如，一个长度为 1 字节的 类型 xattr（ ， ）会使表达式 变成 ，该值显然不小于 。因此，该长度检查通过，随后执行的 会从缓冲区末尾之后开始读取 个字节，而该缓冲区是由 分

AI Predicted 7.8 Difficulty: Moderate EPSS 0.18% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 3ea7a56067e663278470c04fd655adf809e72d4d< d823b5f4557083d1dd92096f796a78a2b1b06d10 affected
3ea7a56067e663278470c04fd655adf809e72d4d< caeb105c15ea2431fa8da7ecfa242d0c68272426 affected
3ea7a56067e663278470c04fd655adf809e72d4d< a784b4732ac7e51862b9b210c2d8b2ab9e83568c affected
3ea7a56067e663278470c04fd655adf809e72d4d< b6cb134707a2127d90a58d69dd818679cae8033c affected
3ea7a56067e663278470c04fd655adf809e72d4d< 7e515b6c9aab452a4f0734bd7208e4e780e164ca affected
3ea7a56067e663278470c04fd655adf809e72d4d< 27f3924061592d0ef6b04e16f48754b6cb6adf27 affected
3ea7a56067e663278470c04fd655adf809e72d4d< dd04114af0d451091f7b8cbd26d9e37d011e9131 affected
3ea7a56067e663278470c04fd655adf809e72d4d< 5ff232d31106f45ac87c3b64e1d35a0667777797 affected
… +10 more rows
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I. Basic Information for CVE-2026-74671

Vulnerability Information
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Vulnerability Title
ima: fix out-of-bounds read in xattr_verify()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ima: fix out-of-bounds read in xattr_verify() The digest-length check in xattr_verify() mixes int and size_t: if (xattr_len - sizeof(xattr_value->type) - hash_start >= iint->ima_hash->length) sizeof() yields size_t, so the usual arithmetic conversions promote the whole left-hand side to unsigned 64-bit before the subtraction runs. For a truncated xattr this underflows instead of going negative: a 1-byte IMA_XATTR_DIGEST_NG xattr (xattr_len == 1, hash_start == 1) turns "1 - 1 - 1" into SIZE_MAX, which is trivially >= ima_hash->length. The check then passes and the following memcmp() reads iint->ima_hash->length bytes starting past the end of the buffer vfs_getxattr_alloc() allocated for it. Nothing upstream clamps xattr_len back into a safe range first: ima_get_hash_algo() only special-cases xattr_len < 2 to pick a default algorithm, and evm_verifyxattr() returns INTEGRITY_UNKNOWN rather than failing when no HMAC key is loaded, so a truncated security.ima value reaches the length check as-is. Rewrite the comparison so every operand stays a signed int and no implicit conversion to size_t can occur.
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 3ea7a56067e663278470c04fd655adf809e72d4d ~ d823b5f4557083d1dd92096f796a78a2b1b06d10 -
Linux Linux 3.13 -

II. Public POCs for CVE-2026-74671

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III. Intelligence Information for CVE-2026-74671

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Patches & Fixes for CVE-2026-74671 (7)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74712 9.3 CRITICAL vdpa/mlx5: Fix buffer length in create_direct_keys()
CVE-2026-74665 9.1 CRITICAL net: fix skb length accounting after generic XDP frag adjustment

Showing top 20 of 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74671

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