CVE-2026-74590— fsverity: Fix bpf_get_fsverity_digest() dynptr assumptions
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： fsverity：修复 对 dynptr 的假设错误 BPF 验证器和 dynptr 抽象机制确保 dynptr 所引用的内存空间保持有效，但并未保证这些内存内容在访问过程中保持稳定。kfuncs（内核函数）即使在发生并发修改的情况下，也应始终保持内存安全。 然而， 未遵循这一要求：如果 在运行过程中被并发修改，可能导致内核崩溃。 本次修复通过使用已知的安全值 替代原不可靠的值，解决了该问题。 此外，将 和 的类型从 扩展为 ，以匹配 的返回类型。尽管目前由于 排除了基于文
Possible ATT&CK Techniques 1 AI
T1055 · Process InjectionAffected Version Matrix 10
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 67814c00de3161181cddd06c77aeaf86ac4cc584< 1344b632cb5043e32939a84568125719111c5af3 |
affected |
67814c00de3161181cddd06c77aeaf86ac4cc584< 2a5cfcad1d56e26d645b7887b0ed24c371851525 |
affected | ||
67814c00de3161181cddd06c77aeaf86ac4cc584< 5bd63cad9df4328a184c409fbdad4f17944bcdb8 |
affected | ||
67814c00de3161181cddd06c77aeaf86ac4cc584< 3e8ec7c0387273329374f5c7bd61f5f38af71fe1 |
affected | ||
6.8 |
affected | ||
< 6.8 |
unaffected | ||
6.12.104≤ 6.12.* |
unaffected | ||
6.18.45≤ 6.18.* |
unaffected | ||
| … +2 more rows | |||
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-74590
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
fsverity: Fix bpf_get_fsverity_digest() dynptr assumptions
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
fsverity: Fix bpf_get_fsverity_digest() dynptr assumptions
The BPF verifier and the dynptr abstraction ensure that the memory space
referenced by a dynptr remains valid. They do not, however, provide any
guarantee that the contents of the memory are stable. kfuncs are
expected to remain memory-safe even if concurrent modifications occur.
bpf_get_fsverity_digest() didn't follow that: it could crash if
arg->digest_size was concurrently modified.
Fix that by using the known-good value hash_alg->digest_size instead.
Also widen 'dynptr_sz' and 'out_digest_sz' to u64 to match the return
type of __bpf_dynptr_size(). It doesn't appear that it can actually be
more than INT_MAX currently (since __bpf_dynptr_data_rw() excludes
file-based pointers), but the correct type might as well be used.
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
II. Public POCs for CVE-2026-74590
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-74590
请登录查看更多情报信息。
Patches & Fixes for CVE-2026-74590 (4)
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-2026-74617 | 9.8 CRITICAL | dibs: initialise dibs->lock in dibs_dev_alloc() |
| CVE-2026-74591 | 9.8 CRITICAL | mm/filemap: __filemap_add_folio() restore index before retrying |
| CVE-2026-74662 | 9.8 CRITICAL | inet: frags: publish queues before arming timer |
| CVE-2026-74628 | 9.8 CRITICAL | net/x25: fix use-after-free of the socket by its timers |
| CVE-2026-74669 | 9.8 CRITICAL | ipvs: clear IPv4 options after rebasing tunnel ICMP errors |
| 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-2026-74597 | 9.8 CRITICAL | ip6_tunnel: clear skb2->cb[] in ip6ip6_err() |
| CVE-2026-74588 | 9.8 CRITICAL | sctp: keep chunk->transport in step with the list it is queued on |
| 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-2026-74730 | 9.8 CRITICAL | NFS: Pin the 'struct nfs_server' during a FREE_STATEID call |
| CVE-2026-74727 | 9.8 CRITICAL | ovpn: skip rehash for peers already removed from by_id |
| CVE-2026-74586 | 9.8 CRITICAL | sctp: clear new_transport when removing a peer |
| 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-2026-74712 | 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 → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-74733
gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock -
CVE-2026-74732
drm/amd/display: Check for tg ops in dce110_set_avmute -
CVE-2026-74731
sched_ext: Skip sub-disable teardown for never-linked sub-sc -
CVE-2026-74730
NFS: Pin the 'struct nfs_server' during a FREE_STATEID call -
CVE-2026-74729
soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_
Same vendor: Linux
-
CVE-2026-74733
gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock -
CVE-2026-74732
drm/amd/display: Check for tg ops in dce110_set_avmute -
CVE-2026-74731
sched_ext: Skip sub-disable teardown for never-linked sub-sc -
CVE-2026-74730
NFS: Pin the 'struct nfs_server' during a FREE_STATEID call -
CVE-2026-74729
soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_
V. Comments for CVE-2026-74590
No comments yet