CVE-2021-47329

The Linux Kernel, the operating system core itself.

Security Fix(es):

In the Linux kernel, the following vulnerability has been resolved:

net: cdc_eem: fix tx fixup skb leak

when usbnet transmit a skb, eem fixup it in eem_tx_fixup(), if skb_copy_expand() failed, it return NULL, usbnet_start_xmit() will have no chance to free original skb.

fix it by free orginal skb in eem_tx_fixup() first, then check skb clone status, if failed, return NULL to usbnet.(CVE-2021-47236)

In the Linux kernel, the following vulnerability has been resolved:

gfs2: Fix use-after-free in gfs2_glock_shrink_scan

The GLF_LRU flag is checked under lru_lock in gfs2_glock_remove_from_lru() to remove the glock from the lru list in __gfs2_glock_put().

On the shrink scan path, the same flag is cleared under lru_lock but because of cond_resched_lock(&lru_lock) in gfs2_dispose_glock_lru(), progress on the put side can be made without deleting the glock from the lru list.

Keep GLF_LRU across the race window opened by cond_resched_lock(&lru_lock) to ensure correct behavior on both sides - clear GLF_LRU after list_del under lru_lock.(CVE-2021-47254)

In the Linux kernel, the following vulnerability has been resolved:

netrom: Decrease sock refcount when sock timers expire

Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use sock timer API. It replaces mod_timer() by sk_reset_timer(), and del_timer() by sk_stop_timer().

Function sk_reset_timer() will increase the refcount of sock if it is called on an inactive timer, hence, in case the timer expires, we need to decrease the refcount ourselves in the handler, otherwise, the sock refcount will be unbalanced and the sock will never be freed.(CVE-2021-47294)

In the Linux kernel, the following vulnerability has been resolved:

memory: fsl_ifc: fix leak of IO mapping on probe failure

On probe error the driver should unmap the IO memory. Smatch reports:

drivers/memory/fsl_ifc.c:298 fsl_ifc_ctrl_probe() warn: 'fsl_ifc_ctrl_dev->gregs' not released on lines: 298.(CVE-2021-47315)

In the Linux kernel, the following vulnerability has been resolved:

watchdog: Fix possible use-after-free in wdt_startup()

This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free.

Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.(CVE-2021-47324)

In the Linux kernel, the following vulnerability has been resolved:

scsi: megaraid_sas: Fix resource leak in case of probe failure

The driver doesn't clean up all the allocated resources properly when scsi_add_host(), megasas_start_aen() function fails during the PCI device probe.

Clean up all those resources.(CVE-2021-47329)

In the Linux kernel, the following vulnerability has been resolved:

ipack: ipoctal: fix module reference leak

A reference to the carrier module was taken on every open but was only released once when the final reference to the tty struct was dropped.

Fix this by taking the module reference and initialising the tty driver data when installing the tty.(CVE-2021-47403)

In the Linux kernel, the following vulnerability has been resolved:

usb: dwc2: check return value after calling platform_get_resource()

It will cause null-ptr-deref if platform_get_resource() returns NULL, we need check the return value.(CVE-2021-47409)

In the Linux kernel, the following vulnerability has been resolved:

i40e: Fix freeing of uninitialized misc IRQ vector

When VSI set up failed in i40e_probe() as part of PF switch set up driver was trying to free misc IRQ vectors in i40e_clear_interrupt_scheme and produced a kernel Oops:

Trying to free already-free IRQ 266 WARNING:…

In the Linux kernel, the following vulnerability has been resolved: scsi: megaraid_sas: Fix resource leak in case of probe failure The driver doesn't clean up all the allocated resources properly when scsi_add_host(), megasas_start_aen() function fails during the PCI device probe. Clean up all those resources.

The SUSE Linux Enterprise 15 SP3 RT kernel was updated to receive various security bugfixes.

The following security bugs were fixed:

• CVE-2024-26921: Preserve kabi for sk_buff (bsc#1223138).
• CVE-2021-47378: Destroy cm id before destroy qp to avoid use after free (bsc#1225201).
• CVE-2021-47496: Fix flipped sign in tls_err_abort() calls (bsc#1225354)
• CVE-2021-47402: Protect fl_walk() with rcu (bsc#1225301)
• CVE-2022-48673: kABI workarounds for struct smc_link (bsc#1223934).
• CVE-2023-52871: Handle a second device without data corruption (bsc#1225534)
• CVE-2024-26828: Fixed underflow in parse_server_interfaces() (bsc#1223084).
• CVE-2021-47497: Fixed shift-out-of-bound (UBSAN) with byte size cells (bsc#1225355).
• CVE-2021-47500: Fixed trigger reference couting (bsc#1225360).
• CVE-2024-27413: Fixed incorrect allocation size (bsc#1224438).
• CVE-2021-47383: Fiedx out-of-bound vmalloc access in imageblit (bsc#1225208).
• CVE-2021-47511: Fixed negative period/buffer sizes (bsc#1225411).
• CVE-2023-52840: Fix use after free in rmi_unregister_function() (bsc#1224928).
• CVE-2021-47261: Fix initializing CQ fragments buffer (bsc#1224954)
• CVE-2021-47254: Fix use-after-free in gfs2_glock_shrink_scan (bsc#1224888).
• CVE-2024-27398: Fixed use-after-free bugs caused by sco_sock_timeout (bsc#1224174).
• CVE-2024-26929: Fixed double free of fcport (bsc#1223715).
• CVE-2024-26930: Fixed double free of the ha->vp_map pointer (bsc#1223626).
• CVE-2023-52655: Check packet for fixup for true limit (bsc#1217169).
• CVE-2023-4244: Fixed a use-after-free in the nf_tables component, which could be exploited to achieve local privilege escalation (bsc#1215420).
• CVE-2023-1829: Fixed a use-after-free vulnerability in the control index filter (tcindex) (bsc#1210335).
• CVE-2023-52686: Fix a null pointer in opal_event_init() (bsc#1065729).

The following non-security bugs were fixed:

• af_unix: annote lockless accesses to unix_tot_inflight & gc_in_progress (bsc#1223384).
• af_unix: Do not use atomic ops for unix_sk(sk)->inflight (bsc#1223384).
• af_unix: Replace BUG_ON() with WARN_ON_ONCE() (bsc#1223384).
• btrfs: do not start relocation until in progress drops are done (bsc#1222251).
• btrfs: do not start relocation until in progress drops are done (bsc#1222251).
• cifs: add missing spinlock around tcon refcount (bsc#1213476).
• cifs: avoid dup prefix path in dfs_get_automount_devname() (bsc#1213476).
• cifs: avoid race conditions with parallel reconnects (bsc#1213476).
• cifs: avoid re-lookups in dfs_cache_find() (bsc#1213476).
• cifs: avoid use of global locks for high contention data (bsc#1213476).
• cifs: check only tcon status on tcon related functions (bsc#1213476).
• cifs: do all necessary checks for credits within or before locking (bsc#1213476).
• cifs: do not block in dfs_cache_noreq_update_tgthint() (bsc#1213476).
• cifs: do not refresh cached referrals from unactive mounts (bsc#1213476).
• cifs: do not take exclusive lock for updating target hints (bsc#1213476).
• cifs: fix confusing debug message (bsc#1213476).
• cifs: fix missing unload_nls() in smb2_reconnect() (bsc#1213476).
• cifs: fix potential deadlock in cache_refresh_path() (bsc#1213476).
• cifs: fix refresh of cached referrals (bsc#1213476).
• cifs: fix return of uninitialized rc in dfs_cache_update_tgthint() (bsc#1213476).
• cifs: fix source pathname comparison of dfs supers (bsc#1213476).
• cifs: fix status checks in cifs_tree_connect (bsc#1213476).
• cifs: fix use-after-free bug in refresh_cache_worker() (bsc#1213476).
• cifs: get rid of dns resolve worker (bsc#1213476).
• cifs: get rid of mount options string parsing (bsc#1213476).
• cifs: handle cache lookup errors different than -ENOENT (bsc#1213476).
• cifs: ignore ipc reconnect failures during dfs failover (bsc#1213476).
• cifs: match even the scope id for ipv6 addresses (bsc#1213476).
• cifs: optimize reconnect of nested links (bsc#1213476).
• cifs: prevent data race in smb2_reconnect() (bsc#1213476). -…

The SUSE Linux Enterprise 15 SP3 kernel was updated to receive various security bugfixes.

The following security bugs were fixed:

• CVE-2021-47378: Destroy cm id before destroy qp to avoid use after free (bsc#1225201).
• CVE-2021-47496: Fix flipped sign in tls_err_abort() calls (bsc#1225354)
• CVE-2021-47402: Protect fl_walk() with rcu (bsc#1225301)
• CVE-2022-48673: kABI workarounds for struct smc_link (bsc#1223934).
• CVE-2023-52871: Handle a second device without data corruption (bsc#1225534)
• CVE-2024-26828: Fix underflow in parse_server_interfaces() (bsc#1223084).
• CVE-2021-47497: Fixed shift-out-of-bound (UBSAN) with byte size cells (bsc#1225355).
• CVE-2021-47500: Fixed trigger reference couting (bsc#1225360).
• CVE-2024-27413: Fix incorrect allocation size (bsc#1224438).
• CVE-2021-47383: Fiedx out-of-bound vmalloc access in imageblit (bsc#1225208).
• CVE-2021-47511: Fixed negative period/buffer sizes (bsc#1225411).
• CVE-2023-52840: Fix use after free in rmi_unregister_function() (bsc#1224928).
• CVE-2021-47261: Fix initializing CQ fragments buffer (bsc#1224954)
• CVE-2021-47254: Fix use-after-free in gfs2_glock_shrink_scan (bsc#1224888).
• CVE-2024-27398: Fixed use-after-free bugs caused by sco_sock_timeout (bsc#1224174).
• CVE-2024-26921: Preserve kabi for sk_buff (bsc#1223138).
• CVE-2023-52655: Check packet for fixup for true limit (bsc#1217169).
• CVE-2023-4244: Fixed a use-after-free in the nf_tables component, which could be exploited to achieve local privilege escalation (bsc#1215420).
• CVE-2023-4244: Fixed a use-after-free in the nf_tables component, which could be exploited to achieve local privilege escalation (bsc#1215420).
• CVE-2023-1829: Fixed a use-after-free vulnerability in the control index filter (tcindex) (bsc#1210335).
• CVE-2023-52686: Fix a null pointer in opal_event_init() (bsc#1065729).

The following non-security bugs were fixed:

• af_unix: annote lockless accesses to unix_tot_inflight & gc_in_progress (bsc#1223384).
• af_unix: Do not use atomic ops for unix_sk(sk)->inflight (bsc#1223384).
• af_unix: Replace BUG_ON() with WARN_ON_ONCE() (bsc#1223384).
• btrfs: do not start relocation until in progress drops are done (bsc#1222251).
• btrfs: do not start relocation until in progress drops are done (bsc#1222251).
• cifs: add missing spinlock around tcon refcount (bsc#1213476).
• cifs: avoid dup prefix path in dfs_get_automount_devname() (bsc#1213476).
• cifs: avoid race conditions with parallel reconnects (bsc#1213476).
• cifs: avoid re-lookups in dfs_cache_find() (bsc#1213476).
• cifs: avoid use of global locks for high contention data (bsc#1213476).
• cifs: check only tcon status on tcon related functions (bsc#1213476).
• cifs: do all necessary checks for credits within or before locking (bsc#1213476).
• cifs: do not block in dfs_cache_noreq_update_tgthint() (bsc#1213476).
• cifs: do not refresh cached referrals from unactive mounts (bsc#1213476).
• cifs: do not take exclusive lock for updating target hints (bsc#1213476).
• cifs: fix confusing debug message (bsc#1213476).
• cifs: fix missing unload_nls() in smb2_reconnect() (bsc#1213476).
• cifs: fix potential deadlock in cache_refresh_path() (bsc#1213476).
• cifs: fix refresh of cached referrals (bsc#1213476).
• cifs: fix return of uninitialized rc in dfs_cache_update_tgthint() (bsc#1213476).
• cifs: fix source pathname comparison of dfs supers (bsc#1213476).
• cifs: fix status checks in cifs_tree_connect (bsc#1213476).
• cifs: fix use-after-free bug in refresh_cache_worker() (bsc#1213476).
• cifs: get rid of dns resolve worker (bsc#1213476).
• cifs: get rid of mount options string parsing (bsc#1213476).
• cifs: handle cache lookup errors different than -ENOENT (bsc#1213476).
• cifs: ignore ipc reconnect failures during dfs failover (bsc#1213476).
• cifs: match even the scope id for ipv6 addresses (bsc#1213476).
• cifs: optimize reconnect of nested links (bsc#1213476).
• cifs: prevent data race in smb2_reconnect() (bsc#1213476). -…