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CVE-2026-80928— smack: fix cred UAF in smack_file_send_sigiotask()

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基金会开源的一个操作系统内核。 Linux kernel 6.12.109之前版本、6.18.50之前版本和7.2.4之前版本存在安全漏洞，该漏洞源于smack_file_send_sigiotask()函数访问非当前任务的->cred凭证导致释放后重用，可能引发竞争条件。

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1574 · Hijack Execution Flow

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 3b11a1decef07c19443d24ae926982bc8ec9f4c0< a512366d84e134a9eefc2cc40eeb6e80e2ec162c affected
3b11a1decef07c19443d24ae926982bc8ec9f4c0< 7c7fe043f3099d0d35002b248967f75e55345b93 affected
3b11a1decef07c19443d24ae926982bc8ec9f4c0< f9c7b1f2b9d8f4176d2632743f51400855978ace affected
3b11a1decef07c19443d24ae926982bc8ec9f4c0< b5bcf3adfa27279da4401ab8f1e1a706601a92be affected
3b11a1decef07c19443d24ae926982bc8ec9f4c0< ed64aa505875a3b4defd504ee8e59e1949246a62 affected
3b11a1decef07c19443d24ae926982bc8ec9f4c0< b791401bf389a1546a830d2b381ca60fe94c7870 affected
3b11a1decef07c19443d24ae926982bc8ec9f4c0< fedc88e38ce979a720cd2de042578cb5df3dc8de affected
2.6.29 affected
… +8 more rows
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I. Basic Information for CVE-2026-80928

Vulnerability Information
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Vulnerability Title
smack: fix cred UAF in smack_file_send_sigiotask()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smack: fix cred UAF in smack_file_send_sigiotask() When inspecting the credentials of another task, objective credentials (->real_cred, accessed with __task_cred()) must always be used. Accessing ->cred on a non-current task is forbidden unless that task is being created or destroyed; a task is allowed to change its own ->cred pointer with no synchronization, and changing ->cred should only affect the current syscall. smack_file_send_sigiotask() was accessing both sets of credentials: First tsk->cred, then __task_cred(tsk). Fix it, always access the objective credentials here. I have tested that this bug can lead to a KASAN-reported UAF of struct cred in smack_file_send_sigiotask(), and that this fix prevents the race.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 6.12.109之前版本、6.18.50之前版本和7.2.4之前版本存在安全漏洞，该漏洞源于smack_file_send_sigiotask()函数访问非当前任务的->cred凭证导致释放后重用，可能引发竞争条件。
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 3b11a1decef07c19443d24ae926982bc8ec9f4c0 ~ a512366d84e134a9eefc2cc40eeb6e80e2ec162c -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2026-80928

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III. Intelligence Information for CVE-2026-80928

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Patches & Fixes for CVE-2026-80928 (7)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89688 9.8 CRITICAL nfsd: drop the stateid, not the stateowner, on seqid_op replay retry
CVE-2026-89656 9.8 CRITICAL libceph: reject buckets with mismatched CRUSH ids
CVE-2026-89655 9.8 CRITICAL ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock
CVE-2026-89658 9.8 CRITICAL NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup
CVE-2026-89660 9.8 CRITICAL NFSD: Prevent client use-after-free during admin state revocation
CVE-2026-89659 9.8 CRITICAL NFSD: Prevent client use-after-free during delegation revoke
CVE-2026-89662 9.8 CRITICAL NFSD: Prevent lock owner use-after-free during client teardown
CVE-2026-89669 9.8 CRITICAL nfsd: initialize copy-notify stateid before publishing it
CVE-2026-89674 9.8 CRITICAL nfsd: fix XDR length calculation in nfsd4_ff_encode_layoutget
CVE-2026-89675 9.8 CRITICAL nfsd: fix UAF in async copy cancel and shutdown
CVE-2026-89676 9.8 CRITICAL nfsd: fix stale s2s_cp_stateids IDR entry for async COPY
CVE-2026-89677 9.8 CRITICAL nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file()
CVE-2026-89681 9.8 CRITICAL nfsd: fix layout fence worker double-reference race
CVE-2026-89686 9.8 CRITICAL nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke
CVE-2026-89478 9.8 CRITICAL sctp: drop a chunk if its transport was removed
CVE-2026-89479 9.8 CRITICAL sctp: stop processing a packet once its association is deleted
CVE-2026-89702 9.8 CRITICAL nfsd: size fh_verify server sockaddr slot by xpt_locallen
CVE-2026-89703 9.8 CRITICAL nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations
CVE-2026-89482 9.8 CRITICAL nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89708 9.8 CRITICAL nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80928

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