Summary
Qualys discovered that several vulnerabilities existed in the AppArmor
Linux kernel Security Module (LSM). An unprivileged local attacker could
use these issues to load, replace, and remove arbitrary AppArmor profiles
causing denial of service, exposure of sensitive information (kernel
memory), local privilege escalation, or possibly escape a container.
(LP: #2143853, CVE-2026-23268, CVE-2026-23269, CVE-2026-23403,
CVE-2026-23404, CVE-2026-23405, CVE-2026-23410, CVE-2026-23411)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- Cryptographic API;
- GPU drivers;
- Network drivers;
- UDF file system;
- NFC subsystem;
- Network traffic control;
- Sun RPC protocol;
- XFRM subsystem;
(CVE-2024-27388, CVE-2024-46777, CVE-2024-46816, CVE-2024-49938,
CVE-2024-50008, CVE-2024-50142, CVE-2025-21735, CVE-2025-37849,
CVE-2026-23060, CVE-2026-23074, CVE-2026-23209)
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · Pro 16.04 LTS Pro:16.04:LTS | linux-azure | 4.15.0-1200.215~16.04.1 |
| Ubuntu · Pro 16.04 LTS Pro:16.04:LTS | linux-oracle | 4.15.0-1153.164~16.04.1 |
| Ubuntu · Pro FIPS-updates 18.04 LTS Pro:FIPS-updates:18.04:LTS | linux-azure-fips | 4.15.0-2109.115 |
Vulnerabilities 18
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Critical 9.8
SUNRPC: fix some memleaks in gssx_dec_option_array
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: fix some memleaks in gssx_dec_option_array The creds and oa->data need to be freed in the error-handling paths after their allocation. So this patch add these deallocations in the cor…
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High 8.8
NFC: nci: Add bounds checking in nci_hci_create_pipe()
In the Linux kernel, the following vulnerability has been resolved: NFC: nci: Add bounds checking in nci_hci_create_pipe() The "pipe" variable is a u8 which comes from the network. If it's more than 127, then it results in memory corruption in the caller, nci…
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High 8.8
KVM: arm64: Tear down vGIC on failed vCPU creation
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Tear down vGIC on failed vCPU creation If kvm_arch_vcpu_create() fails to share the vCPU page with the hypervisor, we propagate the error back to the ioctl but leave the vGIC vCPU…
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High 7.8
udf: Avoid excessive partition lengths
In the Linux kernel, the following vulnerability has been resolved: udf: Avoid excessive partition lengths Avoid mounting filesystems where the partition would overflow the 32-bits used for block number. Also refuse to mount filesystems where the partition le…
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High 7.8
drm/amd/display: Stop amdgpu_dm initialize when link nums greater than max_links
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Stop amdgpu_dm initialize when link nums greater than max_links [Why] Coverity report OVERRUN warning. There are only max_links elements within dc->links. link count could up…
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High 7.8
net/sched: Enforce that teql can only be used as root qdisc
In the Linux kernel, the following vulnerability has been resolved: net/sched: Enforce that teql can only be used as root qdisc Design intent of teql is that it is only supposed to be used as root qdisc. We need to check for that constraint. Although not impo…
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High 7.8
macvlan: fix error recovery in macvlan_common_newlink()
In the Linux kernel, the following vulnerability has been resolved: macvlan: fix error recovery in macvlan_common_newlink() valis provided a nice repro to crash the kernel: ip link add p1 type veth peer p2 ip link set address 00:00:00:00:00:20 dev p1 ip link …
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High 7.8
apparmor: fix unprivileged local user can do privileged policy management
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix unprivileged local user can do privileged policy management An unprivileged local user can load, replace, and remove profiles by opening the apparmorfs interfaces, via a confuse…
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High 7.8
apparmor: fix race on rawdata dereference
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix race on rawdata dereference There is a race condition that leads to a use-after-free situation: because the rawdata inodes are not refcounted, an attacker can start open()ing on…
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High 7.8
apparmor: fix race between freeing data and fs accessing it
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix race between freeing data and fs accessing it AppArmor was putting the reference to i_private data on its end after removing the original entry from the file system. However the…
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High 7.1
apparmor: validate DFA start states are in bounds in unpack_pdb
In the Linux kernel, the following vulnerability has been resolved: apparmor: validate DFA start states are in bounds in unpack_pdb Start states are read from untrusted data and used as indexes into the DFA state tables. The aa_dfa_next() function call in unp…
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Medium 5.5
xfrm: validate new SA's prefixlen using SA family when sel.family is unset
In the Linux kernel, the following vulnerability has been resolved: xfrm: validate new SA's prefixlen using SA family when sel.family is unset This expands the validation introduced in commit 07bf7908950a ("xfrm: Validate address prefix lengths in the xfrm se…
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Unscored —
wifi: ath9k_htc: Use __skb_set_length() for resetting urb before resubmit
In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k_htc: Use __skb_set_length() for resetting urb before resubmit Syzbot points out that skb_trim() has a sanity check on the existing length of the skb, which can be uninitialised in…
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Unscored —
wifi: mwifiex: Fix memcpy() field-spanning write warning in mwifiex_cmd_802_11_scan_ext()
In the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: Fix memcpy() field-spanning write warning in mwifiex_cmd_802_11_scan_ext() Replace one-element array with a flexible-array member in `struct host_cmd_ds_802_11_scan_ext`. With …
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Unscored —
crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec
In the Linux kernel, the following vulnerability has been resolved: crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec authencesn assumes an ESP/ESN-formatted AAD. When assoclen is shorter than the minimum expected length, crypto_aut…
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Unscored —
apparmor: fix memory leak in verify_header
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix memory leak in verify_header The function sets `*ns = NULL` on every call, leaking the namespace string allocated in previous iterations when multiple profiles are unpacked. Thi…
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Unscored —
apparmor: replace recursive profile removal with iterative approach
In the Linux kernel, the following vulnerability has been resolved: apparmor: replace recursive profile removal with iterative approach The profile removal code uses recursion when removing nested profiles, which can lead to kernel stack exhaustion and system…
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Unscored —
apparmor: fix: limit the number of levels of policy namespaces
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix: limit the number of levels of policy namespaces Currently the number of policy namespaces is not bounded relying on the user namespace limit. However policy namespaces aren't s…
References
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report
https://ubuntu.com/security/CVE-2024-27388
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report
https://ubuntu.com/security/CVE-2024-46777
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report
https://ubuntu.com/security/CVE-2024-46816
-
report
https://ubuntu.com/security/CVE-2024-49938
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report
https://ubuntu.com/security/CVE-2024-50008
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report
https://ubuntu.com/security/CVE-2024-50142
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report
https://ubuntu.com/security/CVE-2025-21735
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report
https://ubuntu.com/security/CVE-2025-37849
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report
https://ubuntu.com/security/CVE-2026-23060
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report
https://ubuntu.com/security/CVE-2026-23074
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report
https://ubuntu.com/security/CVE-2026-23209
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report
https://ubuntu.com/security/CVE-2026-23268
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report
https://ubuntu.com/security/CVE-2026-23269
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report
https://ubuntu.com/security/CVE-2026-23403
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report
https://ubuntu.com/security/CVE-2026-23404
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report
https://ubuntu.com/security/CVE-2026-23405
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report
https://ubuntu.com/security/CVE-2026-23410
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report
https://ubuntu.com/security/CVE-2026-23411
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report
https://launchpad.net/bugs/2143853