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CVE-2026-46289— lib/scatterlist: fix length calculations in extract_kvec_to_sg

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.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于extract_kvec_to_sg函数中长度计算错误，可能导致缓冲区溢出。

CVSS 9.8 · Critical EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 0185846975339a5c348373aa450a977f5242366b< 3f17500e86d730c76db638bb3ae52f9b5e496c76 affected
0185846975339a5c348373aa450a977f5242366b< e5e22fc9963469e678c4f4bb38d26adcec107f1e affected
0185846975339a5c348373aa450a977f5242366b< 8fbba6829057979149d1b37d65690c037f3ddf4d affected
0185846975339a5c348373aa450a977f5242366b< 9d38756d0a93b66163554219fa9c3365f40c4035 affected
0185846975339a5c348373aa450a977f5242366b< 07b7d66e65d9cfe6b9c2c34aa22cfcaac37a5c45 affected
6.3 affected
< 6.3 unaffected
6.6.140≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-46289

Vulnerability Information
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Vulnerability Title
lib/scatterlist: fix length calculations in extract_kvec_to_sg
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: lib/scatterlist: fix length calculations in extract_kvec_to_sg Patch series "Fix bugs in extract_iter_to_sg()", v3. Fix bugs in the kvec and user variants of extract_iter_to_sg. This series is growing due to useful remarks made by sashiko.dev. The main bugs are: - The length for an sglist entry when extracting from a kvec can exceed the number of bytes in the page. This is obviously not intended. - When extracting a user buffer the sglist is temporarily used as a scratch buffer for extracted page pointers. If the sglist already contains some elements this scratch buffer could overlap with existing entries in the sglist. The series adds test cases to the kunit_iov_iter test that demonstrate all of these bugs. Additionally, there is a memory leak fix for the test itself. The bugs were orignally introduced into kernel v6.3 where the function lived in fs/netfs/iterator.c. It was later moved to lib/scatterlist.c in v6.5. Thus the actual fix is only marked for backports to v6.5+. This patch (of 5): When extracting from a kvec to a scatterlist, do not cross page boundaries. The required length was already calculated but not used as intended. Adjust the copied length if the loop runs out of sglist entries without extracting everything. While there, return immediately from extract_iter_to_sg if there are no sglist entries at all. A subsequent commit will add kunit test cases that demonstrate that the patch is necessary.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于extract_kvec_to_sg函数中长度计算错误，可能导致缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0185846975339a5c348373aa450a977f5242366b ~ 3f17500e86d730c76db638bb3ae52f9b5e496c76 -
Linux Linux 6.3 -

II. Public POCs for CVE-2026-46289

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III. Intelligence Information for CVE-2026-46289

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Patches & Fixes for CVE-2026-46289 (5)

Same Patch Batch · Linux · 2026-06-08 · 41 CVEs total

CVE-2026-46288 8.4 HIGH of: unittest: fix use-after-free in of_unittest_changeset()
CVE-2026-46307 8.3 HIGH wifi: ath5k: do not access array OOB
CVE-2026-46303 8.2 HIGH isofs: validate Rock Ridge CE continuation extent against volume size
CVE-2026-46274 7.8 HIGH io-wq: check that the predecessor is hashed in io_wq_remove_pending()
CVE-2026-46275 7.8 HIGH Bluetooth: hci_uart: fix UAFs and race conditions in close and init paths
CVE-2026-46277 7.8 HIGH mm/zone_device: do not touch device folio after calling ->folio_free()
CVE-2026-46280 7.8 HIGH lib: test_hmm: evict device pages on file close to avoid use-after-free
CVE-2026-46311 7.8 HIGH drm/amdgpu/userq: fix access to stale wptr mapping
CVE-2026-46306 7.5 HIGH flow_dissector: do not dissect PPPoE PFC frames
CVE-2026-46304 7.5 HIGH nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free
CVE-2026-46299 7.0 HIGH hfsplus: fix held lock freed on hfsplus_fill_super()
CVE-2026-46296 spi: s3c64xx: fix NULL-deref on driver unbind
CVE-2026-46314 drm/v3d: Reject empty multisync extension to prevent infinite loop
CVE-2026-46298 pseries/papr-hvpipe: Fix race with interrupt handler
CVE-2026-46301 spi: topcliff-pch: fix use-after-free on unbind
CVE-2026-46302 selinux: allow multiple opens of /sys/fs/selinux/policy
CVE-2026-46305 staging: rtl8723bs: os_dep: avoid NULL pointer dereference in rtw_cbuf_alloc
CVE-2026-46308 pmdomain: mediatek: fix use-after-free in scpsys_get_bus_protection_legacy()
CVE-2026-46309 drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise
CVE-2026-46310 media: renesas: vsp1: Fix NULL pointer deref on module unload

Showing top 20 of 41 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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