[LTS 9.4] CVE-2024-41049, CVE-2024-42301, CVE-2024-46858, CVE-2025-21727, CVE-2025-21887 #531
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jira VULN-8260 cve CVE-2024-41049 commit-author Jeff Layton <[email protected]> commit 1b3ec4f Light Hsieh reported a KASAN UAF warning in trace_posix_lock_inode(). The request pointer had been changed earlier to point to a lock entry that was added to the inode's list. However, before the tracepoint could fire, another task raced in and freed that lock. Fix this by moving the tracepoint inside the spinlock, which should ensure that this doesn't happen. Fixes: 74f6f59 ("locks: fix KASAN: use-after-free in trace_event_raw_event_filelock_lock") Link: https://lore.kernel.org/linux-fsdevel/[email protected]/ Reported-by: Light Hsieh (謝明燈) <[email protected]> Signed-off-by: Jeff Layton <[email protected]> Link: https://lore.kernel.org/r/[email protected] Reviewed-by: Alexander Aring <[email protected]> Signed-off-by: Christian Brauner <[email protected]> (cherry picked from commit 1b3ec4f) Signed-off-by: Marcin Wcisło <[email protected]>
jira VULN-38861 cve CVE-2024-42301 commit-author tuhaowen <[email protected]> commit ab11dac Fixed array out-of-bounds issues caused by sprintf by replacing it with snprintf for safer data copying, ensuring the destination buffer is not overflowed. Below is the stack trace I encountered during the actual issue: [ 66.575408s] [pid:5118,cpu4,QThread,4]Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: do_hardware_base_addr+0xcc/0xd0 [parport] [ 66.575408s] [pid:5118,cpu4,QThread,5]CPU: 4 PID: 5118 Comm: QThread Tainted: G S W O 5.10.97-arm64-desktop #7100.57021.2 [ 66.575439s] [pid:5118,cpu4,QThread,6]TGID: 5087 Comm: EFileApp [ 66.575439s] [pid:5118,cpu4,QThread,7]Hardware name: HUAWEI HUAWEI QingYun PGUX-W515x-B081/SP1PANGUXM, BIOS 1.00.07 04/29/2024 [ 66.575439s] [pid:5118,cpu4,QThread,8]Call trace: [ 66.575469s] [pid:5118,cpu4,QThread,9] dump_backtrace+0x0/0x1c0 [ 66.575469s] [pid:5118,cpu4,QThread,0] show_stack+0x14/0x20 [ 66.575469s] [pid:5118,cpu4,QThread,1] dump_stack+0xd4/0x10c [ 66.575500s] [pid:5118,cpu4,QThread,2] panic+0x1d8/0x3bc [ 66.575500s] [pid:5118,cpu4,QThread,3] __stack_chk_fail+0x2c/0x38 [ 66.575500s] [pid:5118,cpu4,QThread,4] do_hardware_base_addr+0xcc/0xd0 [parport] Signed-off-by: tuhaowen <[email protected]> Cc: stable <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]> (cherry picked from commit ab11dac) Signed-off-by: Marcin Wcisło <[email protected]>
jira VULN-38861 cve-bf CVE-2024-42301 commit-author Takashi Iwai <[email protected]> commit 02ac3a9 The recent fix for array out-of-bounds accesses replaced sprintf() calls blindly with snprintf(). However, since snprintf() returns the would-be-printed size, not the actually output size, the length calculation can still go over the given limit. Use scnprintf() instead of snprintf(), which returns the actually output letters, for addressing the potential out-of-bounds access properly. Fixes: ab11dac ("dev/parport: fix the array out-of-bounds risk") Cc: [email protected] Signed-off-by: Takashi Iwai <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]> (cherry picked from commit 02ac3a9) Signed-off-by: Marcin Wcisło <[email protected]>
jira VULN-8359 cve CVE-2024-46858 commit-author Edward Adam Davis <[email protected]> commit b4cd80b There are two paths to access mptcp_pm_del_add_timer, result in a race condition: CPU1 CPU2 ==== ==== net_rx_action napi_poll netlink_sendmsg __napi_poll netlink_unicast process_backlog netlink_unicast_kernel __netif_receive_skb genl_rcv __netif_receive_skb_one_core netlink_rcv_skb NF_HOOK genl_rcv_msg ip_local_deliver_finish genl_family_rcv_msg ip_protocol_deliver_rcu genl_family_rcv_msg_doit tcp_v4_rcv mptcp_pm_nl_flush_addrs_doit tcp_v4_do_rcv mptcp_nl_remove_addrs_list tcp_rcv_established mptcp_pm_remove_addrs_and_subflows tcp_data_queue remove_anno_list_by_saddr mptcp_incoming_options mptcp_pm_del_add_timer mptcp_pm_del_add_timer kfree(entry) In remove_anno_list_by_saddr(running on CPU2), after leaving the critical zone protected by "pm.lock", the entry will be released, which leads to the occurrence of uaf in the mptcp_pm_del_add_timer(running on CPU1). Keeping a reference to add_timer inside the lock, and calling sk_stop_timer_sync() with this reference, instead of "entry->add_timer". Move list_del(&entry->list) to mptcp_pm_del_add_timer and inside the pm lock, do not directly access any members of the entry outside the pm lock, which can avoid similar "entry->x" uaf. Fixes: 00cfd77 ("mptcp: retransmit ADD_ADDR when timeout") Cc: [email protected] Reported-and-tested-by: [email protected] Closes: https://syzkaller.appspot.com/bug?extid=f3a31fb909db9b2a5c4d Signed-off-by: Matthieu Baerts (NGI0) <[email protected]> Signed-off-by: Edward Adam Davis <[email protected]> Acked-by: Paolo Abeni <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]> (cherry picked from commit b4cd80b) Signed-off-by: Marcin Wcisło <[email protected]>
jira VULN-53766 cve CVE-2025-21727 commit-author Chen Ridong <[email protected]> commit e01780e A bug was found when run ltp test: BUG: KASAN: slab-use-after-free in padata_find_next+0x29/0x1a0 Read of size 4 at addr ffff88bbfe003524 by task kworker/u113:2/3039206 CPU: 0 PID: 3039206 Comm: kworker/u113:2 Kdump: loaded Not tainted 6.6.0+ Workqueue: pdecrypt_parallel padata_parallel_worker Call Trace: <TASK> dump_stack_lvl+0x32/0x50 print_address_description.constprop.0+0x6b/0x3d0 print_report+0xdd/0x2c0 kasan_report+0xa5/0xd0 padata_find_next+0x29/0x1a0 padata_reorder+0x131/0x220 padata_parallel_worker+0x3d/0xc0 process_one_work+0x2ec/0x5a0 If 'mdelay(10)' is added before calling 'padata_find_next' in the 'padata_reorder' function, this issue could be reproduced easily with ltp test (pcrypt_aead01). This can be explained as bellow: pcrypt_aead_encrypt ... padata_do_parallel refcount_inc(&pd->refcnt); // add refcnt ... padata_do_serial padata_reorder // pd while (1) { padata_find_next(pd, true); // using pd queue_work_on ... padata_serial_worker crypto_del_alg padata_put_pd_cnt // sub refcnt padata_free_shell padata_put_pd(ps->pd); // pd is freed // loop again, but pd is freed // call padata_find_next, UAF } In the padata_reorder function, when it loops in 'while', if the alg is deleted, the refcnt may be decreased to 0 before entering 'padata_find_next', which leads to UAF. As mentioned in [1], do_serial is supposed to be called with BHs disabled and always happen under RCU protection, to address this issue, add synchronize_rcu() in 'padata_free_shell' wait for all _do_serial calls to finish. [1] https://lore.kernel.org/all/[email protected]/ [2] https://lore.kernel.org/linux-kernel/jfjz5d7zwbytztackem7ibzalm5lnxldi2eofeiczqmqs2m7o6@fq426cwnjtkm/ Fixes: b128a30 ("padata: allocate workqueue internally") Signed-off-by: Chen Ridong <[email protected]> Signed-off-by: Qu Zicheng <[email protected]> Acked-by: Daniel Jordan <[email protected]> Signed-off-by: Herbert Xu <[email protected]> (cherry picked from commit e01780e) Signed-off-by: Marcin Wcisło <[email protected]>
jira VULN-55376 cve CVE-2025-21887 commit-author Vasiliy Kovalev <[email protected]> commit c84e125 The issue was caused by dput(upper) being called before ovl_dentry_update_reval(), while upper->d_flags was still accessed in ovl_dentry_remote(). Move dput(upper) after its last use to prevent use-after-free. BUG: KASAN: slab-use-after-free in ovl_dentry_remote fs/overlayfs/util.c:162 [inline] BUG: KASAN: slab-use-after-free in ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 ovl_dentry_remote fs/overlayfs/util.c:162 [inline] ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167 ovl_link_up fs/overlayfs/copy_up.c:610 [inline] ovl_copy_up_one+0x2105/0x3490 fs/overlayfs/copy_up.c:1170 ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223 ovl_rename+0x39e/0x18c0 fs/overlayfs/dir.c:1136 vfs_rename+0xf84/0x20a0 fs/namei.c:4893 ... </TASK> Fixes: b07d5cc ("ovl: update of dentry revalidate flags after copy up") Reported-by: [email protected] Closes: https://syzkaller.appspot.com/bug?extid=316db8a1191938280eb6 Signed-off-by: Vasiliy Kovalev <[email protected]> Link: https://lore.kernel.org/r/[email protected] Reviewed-by: Amir Goldstein <[email protected]> Signed-off-by: Christian Brauner <[email protected]> (cherry picked from commit c84e125) Signed-off-by: Marcin Wcisło <[email protected]>
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Aug 29, 2025
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[LTS 9.4]
CVE-2024-41049 VULN-8260
CVE-2024-42301 VULN-38861
CVE-2024-46858 VULN-8359
CVE-2025-21727 VULN-53766
CVE-2025-21887 VULN-55376
Commits
CVE-2024-41049
601e597:
CVE-2024-42301
525ab66:
a18f0a2:
CVE-2024-46858
d8648a4:
CVE-2025-21727
e5e164b:
CVE-2025-21887
731f0b5:
kABI check: passed
Boot test: passed
boot-test.log
Kselftests: passed relative
Reference
kselftests–ciqlts9_4–run1.log
Patch
kselftests–ciqlts9_4-CVE-batch-1–run1.log
kselftests–ciqlts9_4-CVE-batch-1–run2.log
Comparison
The results for the reference kernel and patch are the same.