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CVE-2022-48921— sched/fair: Fix fault in reweight_entity

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，该漏洞源于在reweight_entity函数中存在竞争条件问题，导致在新线程调用setpriority函数时发生空指针取消引用。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux c85c6fadbef0a3eab41540ea628fa8fe8928c820< 8f317cd888059c59e2fa924bf4b0957cfa53f78e affected
3869eecf050416a1d19bac60926f6b5d64b0aa58< e0bcd6b5779352aed88f2e538a82a39f1a7715bb affected
4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a< 589a954daab5e18399860b6c8ffaeaf79844eb20 affected
4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a< 13765de8148f71fa795e0a6607de37c49ea5915a affected
25d40b828fb855ee62e1039c65a666c9afd60786 affected
5.10.80< 5.10.137 affected
5.15.3< 5.15.27 affected
5.14.19< 5.15 affected
… +6 more rows
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I. Basic Information for CVE-2022-48921

Vulnerability Information
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Vulnerability Title
sched/fair: Fix fault in reweight_entity
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sched/fair: Fix fault in reweight_entity Syzbot found a GPF in reweight_entity. This has been bisected to commit 4ef0c5c6b5ba ("kernel/sched: Fix sched_fork() access an invalid sched_task_group") There is a race between sched_post_fork() and setpriority(PRIO_PGRP) within a thread group that causes a null-ptr-deref in reweight_entity() in CFS. The scenario is that the main process spawns number of new threads, which then call setpriority(PRIO_PGRP, 0, -20), wait, and exit. For each of the new threads the copy_process() gets invoked, which adds the new task_struct and calls sched_post_fork() for it. In the above scenario there is a possibility that setpriority(PRIO_PGRP) and set_one_prio() will be called for a thread in the group that is just being created by copy_process(), and for which the sched_post_fork() has not been executed yet. This will trigger a null pointer dereference in reweight_entity(), as it will try to access the run queue pointer, which hasn't been set. Before the mentioned change the cfs_rq pointer for the task has been set in sched_fork(), which is called much earlier in copy_process(), before the new task is added to the thread_group. Now it is done in the sched_post_fork(), which is called after that. To fix the issue the remove the update_load param from the update_load param() function and call reweight_task() only if the task flag doesn't have the TASK_NEW flag set.
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
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，该漏洞源于在reweight_entity函数中存在竞争条件问题，导致在新线程调用setpriority函数时发生空指针取消引用。
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 c85c6fadbef0a3eab41540ea628fa8fe8928c820 ~ 8f317cd888059c59e2fa924bf4b0957cfa53f78e -
Linux Linux 5.16 -

II. Public POCs for CVE-2022-48921

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III. Intelligence Information for CVE-2022-48921

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Other References for CVE-2022-48921 (4)

Same Patch Batch · Linux · 2024-08-22 · 42 CVEs total

CVE-2022-48941 8.8 HIGH ice: fix concurrent reset and removal of VFs
CVE-2022-48919 8.8 HIGH cifs: fix double free race when mount fails in cifs_get_root()
CVE-2022-48925 7.8 HIGH RDMA/cma: Do not change route.addr.src_addr outside state checks
CVE-2022-48923 7.8 HIGH btrfs: prevent copying too big compressed lzo segment
CVE-2022-48927 7.8 HIGH iio: adc: tsc2046: fix memory corruption by preventing array overflow
CVE-2022-48913 7.8 HIGH blktrace: fix use after free for struct blk_trace
CVE-2022-48912 7.8 HIGH netfilter: fix use-after-free in __nf_register_net_hook()
CVE-2022-48911 7.8 HIGH netfilter: nf_queue: fix possible use-after-free
CVE-2022-48932 7.8 HIGH net/mlx5: DR, Fix slab-out-of-bounds in mlx5_cmd_dr_create_fte
CVE-2022-48935 7.8 HIGH netfilter: nf_tables: unregister flowtable hooks on netns exit
CVE-2022-48940 7.8 HIGH bpf: Fix crash due to incorrect copy_map_value
CVE-2022-48943 7.1 HIGH KVM: x86/mmu: make apf token non-zero to fix bug
CVE-2022-48933 netfilter: nf_tables: fix memory leak during stateful obj update
CVE-2022-48931 configfs: fix a race in configfs_{,un}register_subsystem()
CVE-2022-48934 nfp: flower: Fix a potential leak in nfp_tunnel_add_shared_mac()
CVE-2022-48937 io_uring: add a schedule point in io_add_buffers()
CVE-2022-48930 RDMA/ib_srp: Fix a deadlock
CVE-2022-48929 bpf: Fix crash due to out of bounds access into reg2btf_ids.
CVE-2022-48928 iio: adc: men_z188_adc: Fix a resource leak in an error handling path
CVE-2022-48938 CDC-NCM: avoid overflow in sanity checking

Showing top 20 of 42 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-48921

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