In the Linux kernel, the following vulnerability has been resolved: mm/uffd: fix pte marker when fork() without fork event Patch series "mm: Fixes on pte markers". Patch 1 resolves the syzkiller report from Pengfei. Patch 2 further harden pte markers when used with the recent swapin error markers. The major case is we should persist a swapin error marker after fork(), so child shouldn't read a corrupted page. This patch (of 2): When fork(), dst_vma is not guaranteed to have VM_UFFD_WP even if src may have it and has pte marker installed. The warning is improper along with the comment. The right thing is to inherit the pte marker when needed, or keep the dst pte empty. A vague guess is this happened by an accident when there's the prior patch to introduce src/dst vma into this helper during the uffd-wp feature got developed and I probably messed up in the rebase, since if we replace dst_vma with src_vma the warning & comment it all makes sense too. Hugetlb did exactly the right here (copy_hugetlb_page_range()). Fix the general path. Reproducer: https://github.com/xupengfe/syzkaller_logs/blob/main/221208_115556_copy_page_range/repro.c Bugzilla report: https://bugzilla.kernel.org/show_bug.cgi?id=216808

The AlmaLinux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1783355084 advisory.

  - In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83792d) Fix NULL pointer     dereference by removing unnecessary structure field If driver read val value sufficient for (val & 0x08)     && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) from device then Null pointer dereference     occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not     serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients(). The     patch fixes possible NULL pointer dereference by removing lm75[]. Found by Linux Driver Verification     project (linuxtesting.org). [groeck: Dropped unnecessary continuation lines, fixed multipline alignment]     (CVE-2021-47385)

  - In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83791d) Fix NULL pointer     dereference by removing unnecessary structure field If driver read val value sufficient for (val & 0x08)     && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) from device then Null pointer dereference     occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not     serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients(). The     patch fixes possible NULL pointer dereference by removing lm75[]. Found by Linux Driver Verification     project (linuxtesting.org). [groeck: Dropped unnecessary continuation lines, fixed multi-line alignment]     (CVE-2021-47386)

  - In the Linux kernel, the following vulnerability has been resolved: mm/uffd: fix pte marker when fork()     without fork event Patch series mm: Fixes on pte markers. Patch 1 resolves the syzkiller report from     Pengfei. Patch 2 further harden pte markers when used with the recent swapin error markers. The major case     is we should persist a swapin error marker after fork(), so child shouldn't read a corrupted page. This     patch (of 2): When fork(), dst_vma is not guaranteed to have VM_UFFD_WP even if src may have it and has     pte marker installed. The warning is improper along with the comment. The right thing is to inherit the     pte marker when needed, or keep the dst pte empty. A vague guess is this happened by an accident when     there's the prior patch to introduce src/dst vma into this helper during the uffd-wp feature got developed     and I probably messed up in the rebase, since if we replace dst_vma with src_vma the warning & comment it     all makes sense too. Hugetlb did exactly the right here (copy_hugetlb_page_range()). Fix the general path.
    Reproducer: https://github.com/xupengfe/syzkaller_logs/blob/main/221208_115556_copy_page_range/repro.c     Bugzilla report: https://bugzilla.kernel.org/show_bug.cgi?id=216808 (CVE-2022-49744)

  - In the Linux kernel, the following vulnerability has been resolved: drm/vkms: Fix memory leak in     vkms_init() A memory leak was reported after the vkms module install failed. unreferenced object     0xffff88810bc28520 (size 16): comm modprobe, pid 9662, jiffies 4298009455 (age 42.590s) hex dump (first     16 bytes): 01 01 00 64 81 88 ff ff 00 00 dc 0a 81 88 ff ff ...d............ backtrace:
    [<00000000e7561ff8>] kmalloc_trace+0x27/0x60 [<000000000b1954a0>] 0xffffffffc45200a9 [<00000000abbf1da0>]     do_one_initcall+0xd0/0x4f0 [<000000001505ee87>] do_init_module+0x1a4/0x680 [<00000000958079ad>]     load_module+0x6249/0x7110 [<00000000117e4696>] __do_sys_finit_module+0x140/0x200 [<00000000f74b12d2>]     do_syscall_64+0x35/0x80 [<000000008fc6fcde>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 The reason is that     the vkms_init() returns without checking the return value of vkms_create(), and if the vkms_create()     failed, the config allocated at the beginning of vkms_init() is leaked. vkms_init() config = kmalloc(...)     # config allocated ... return vkms_create() # vkms_create failed and config is leaked Fix this problem by     checking return value of vkms_create() and free the config if error happened. (CVE-2022-50269)

  - In the Linux kernel, the following vulnerability has been resolved: net: hns: fix possible memory leak in     hnae_ae_register() Inject fault while probing module, if device_register() fails, but the refcount of     kobject is not decreased to 0, the name allocated in dev_set_name() is leaked. Fix this by calling     put_device(), so that name can be freed in callback function kobject_cleanup(). unreferenced object     0xffff00c01aba2100 (size 128): comm systemd-udevd, pid 1259, jiffies 4294903284 (age 294.152s) hex dump     (first 32 bytes): 68 6e 61 65 30 00 00 00 18 21 ba 1a c0 00 ff ff hnae0....!...... 00 00 00 00 00 00 00 00     00 00 00 00 00 00 00 00 ................ backtrace: [<0000000034783f26>] slab_post_alloc_hook+0xa0/0x3e0     [<00000000748188f2>] __kmem_cache_alloc_node+0x164/0x2b0 [<00000000ab0743e8>]
    __kmalloc_node_track_caller+0x6c/0x390 [<000000006c0ffb13>] kvasprintf+0x8c/0x118 [<00000000fa27bfe1>]     kvasprintf_const+0x60/0xc8 [<0000000083e10ed7>] kobject_set_name_vargs+0x3c/0xc0 [<000000000b87affc>]     dev_set_name+0x7c/0xa0 [<000000003fd8fe26>] hnae_ae_register+0xcc/0x190 [hnae] [<00000000fe97edc9>]     hns_dsaf_ae_init+0x9c/0x108 [hns_dsaf] [<00000000c36ff1eb>] hns_dsaf_probe+0x548/0x748 [hns_dsaf]     (CVE-2022-50352)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - In the Linux kernel, the following vulnerability has been resolved: mm/uffd: fix pte marker when fork()     without fork event Patch series mm: Fixes on pte markers. Patch 1 resolves the syzkiller report from     Pengfei. Patch 2 further harden pte markers when used with the recent swapin error markers. The major case     is we should persist a swapin error marker after fork(), so child shouldn't read a corrupted page. This     patch (of 2): When fork(), dst_vma is not guaranteed to have VM_UFFD_WP even if src may have it and has     pte marker installed. The warning is improper along with the comment. The right thing is to inherit the     pte marker when needed, or keep the dst pte empty. A vague guess is this happened by an accident when     there's the prior patch to introduce src/dst vma into this helper during the uffd-wp feature got developed     and I probably messed up in the rebase, since if we replace dst_vma with src_vma the warning & comment it     all makes sense too. Hugetlb did exactly the right here (copy_hugetlb_page_range()). Fix the general path.
    Reproducer: https://github.com/xupengfe/syzkaller_logs/blob/main/221208_115556_copy_page_range/repro.c     Bugzilla report: https://bugzilla.kernel.org/show_bug.cgi?id=216808 (CVE-2022-49744)

Note that Nessus relies on the presence of the package as reported by the vendor.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-132 advisory.

    It has been discovered that on some AMD CPUs, the RAS (Return Address Stack, also called RAP - Return     Address Predictor - in some AMD documentation, and RSB - Return Stack Buffer - in Intel terminology) is     dynamically partitioned between non-idle threads.  This allows an attacker to control speculative     execution on the adjacent thread. (CVE-2022-27672)

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

    ovl: Use buf flexible array for memcpy() destination (CVE-2022-49743)

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

    mm/uffd: fix pte marker when fork() without fork event (CVE-2022-49744)

    The upstream bug report describes this issue as follows:

    A flaw found in the Linux Kernel in RDS (Reliable Datagram Sockets) protocol. The     rds_rm_zerocopy_callback() uses list_entry() on the head of a list causing a type confusion. Local user     can trigger this with rds_message_put(). Type confusion leads to `struct rds_msg_zcopy_info *info`     actually points to something else that is potentially controlled by local user. It is known how to trigger     this, which causes an OOB access, and a lock corruption. (CVE-2023-1078)

    A flaw was found in the Framebuffer Console (fbcon) in the Linux Kernel. When providing a font->width and     font->height greater than 32 to the fbcon_set_font, since there are no checks in place, a shift-out-of-     bounds occurs, leading to undefined behavior and possible denial of service. (CVE-2023-3161)

    brcm_nvram_parse in drivers/nvmem/brcm_nvram.c lacks check of the return value of kzalloc() and will cause     the NULL Pointer Dereference (CVE-2023-3359)

    A use-after-free flaw was found in vcs_read in drivers/tty/vt/vc_screen.c in vc_screen in the Linux     Kernel. In this flaw an attacker with local user access may lead to a system crash or a leak of internal     kernel information. (CVE-2023-3567)

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

    Fix page corruption caused by racy check in __free_pages (CVE-2023-52739)

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

    cifs: Fix use-after-free in rdata->read_into_pages() (CVE-2023-52741)

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

    xfrm/compat: prevent potential spectre v1 gadget in xfrm_xlate32_attr() (CVE-2023-52746)

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

    bpf: Skip invalid kfunc call in backtrack_insn (CVE-2023-52928)

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

    drm/i915: Fix potential bit_17 double-free (CVE-2023-52930)

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

    drm/i915: Avoid potential vm use-after-free (CVE-2023-52931)

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

    mm/swapfile: add cond_resched() in get_swap_pages() (CVE-2023-52932)

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

    Squashfs: fix handling and sanity checking of xattr_ids count (CVE-2023-52933)

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

    mm/MADV_COLLAPSE: catch !none !huge !bad pmd lookups (CVE-2023-52934)

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

    mm/khugepaged: fix ->anon_vma race (CVE-2023-52935)

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

    kernel/irq/irqdomain.c: fix memory leak with using debugfs_lookup() (CVE-2023-52936)

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

    HV: hv_balloon: fix memory leak with using debugfs_lookup() (CVE-2023-52937)

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

    mm: memcg: fix NULL pointer in mem_cgroup_track_foreign_dirty_slowpath() (CVE-2023-52939)

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

    mm: multi-gen LRU: fix crash during cgroup migration (CVE-2023-52940)

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

    cgroup/cpuset: Fix wrong check in update_parent_subparts_cpumask() (CVE-2023-52942)

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

    vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF (CVE-2023-52973)

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

    efi: fix potential NULL deref in efi_mem_reserve_persistent (CVE-2023-52976)

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

    net: openvswitch: fix flow memory leak in ovs_flow_cmd_new (CVE-2023-52977)

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

    squashfs: harden sanity check in squashfs_read_xattr_id_table (CVE-2023-52979)

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

    drm/i915: Fix request ref counting during error capture & debugfs dump (CVE-2023-52981)

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

    fscache: Use wait_on_bit() to wait for the freeing of relinquished volume (CVE-2023-52982)

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

    block, bfq: fix uaf for bfqq in bic_set_bfqq() (CVE-2023-52983)

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

    bpf, sockmap: Check for any of tcp_bpf_prots when cloning a listener (CVE-2023-52986)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
361044	AlmaLinux 9.2 [TuxCare] Security Update: bpftool / kernel / kernel-64k / kernel-64k-core / kernel-64k-debug / etc Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1783355084)	Nessus	Alma Linux Local Security Checks	Local	medium
247369	Linux Distros Unpatched Vulnerability : CVE-2022-49744	Nessus	Misc.	Local	medium
173140	Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2023-132)	Nessus	Amazon Linux Local Security Checks	Local	high

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