CVE-2026-46300

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

net: skbuff: preserve shared-frag marker during coalescing

skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost.

That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags.

Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost. That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags. Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit (CVE-2025-39766)

• kernel: scsi: qla2xxx: Fix improper freeing of purex item (CVE-2025-68741)

• kernel: libceph: make decode_pool() more resilient against corrupted osdmaps (CVE-2025-71116)

• kernel: libceph: prevent potential out-of-bounds reads in handle_auth_done() (CVE-2026-22984)

• kernel: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() (CVE-2026-22990)

• kernel: Linux kernel: Denial of Service in libceph OSD client due to unreset sparse-read state (CVE-2026-23136)

• kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204)

• kernel: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or privilege escalation (CVE-2026-23270)

• kernel: Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling (CVE-2026-23401)

• kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402)

• kernel: can: raw: fix ro->uniq use-after-free in raw_rcv() (CVE-2026-31532)

• kernel: usbip: validate number_of_packets in usbip_pack_ret_submit() (CVE-2026-31607)

• kernel: md/bitmap: fix GPF in write_page caused by resize race (CVE-2026-43163)

• kernel: RDMA/umem: Fix double dma_buf_unpin in failure path (CVE-2026-43128)

• kernel: "Dirty Frag" is a new universal Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-43284)

• kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300)

• kernel: Read root-owned files as an unprivileged user (CVE-2026-46333)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: net: af_can: do not leave a dangling sk pointer in can_create() (CVE-2024-56603)

• kernel: net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit (CVE-2025-39766)

• kernel: crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id (CVE-2025-68724)

• kernel: scsi: qla2xxx: Fix improper freeing of purex item (CVE-2025-68741)

• kernel: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or privilege escalation (CVE-2026-23270)

• kernel: Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling (CVE-2026-23401)

• kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402)

• kernel: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold (CVE-2026-31408)

• kernel: usbip: validate number_of_packets in usbip_pack_ret_submit() (CVE-2026-31607)

• kernel: RDMA/umem: Fix double dma_buf_unpin in failure path (CVE-2026-43128)

• kernel: "Dirty Frag" is a new universal Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-43284)

• kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300)

• kernel: Read root-owned files as an unprivileged user (CVE-2026-46333)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300)

• kernel: Read root-owned files as an unprivileged user (CVE-2026-46333)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300)

• kernel: Read root-owned files as an unprivileged user (CVE-2026-46333)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Root has patched CVE-2026-46300 in the linux package for Root:Debian:11. Multiple fixed versions available.

Root has patched CVE-2026-46300 in the linux package for Root:Debian:12. Multiple fixed versions available.

Root has patched CVE-2026-46300 in the linux package for Root:Debian:13. Multiple fixed versions available.

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost. That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags. Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit (CVE-2025-39766)
• kernel: scsi: qla2xxx: Fix improper freeing of purex item (CVE-2025-68741)
• kernel: libceph: make decode_pool() more resilient against corrupted osdmaps (CVE-2025-71116)
• kernel: libceph: prevent potential out-of-bounds reads in handle_auth_done() (CVE-2026-22984)
• kernel: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() (CVE-2026-22990)
• kernel: Linux kernel: Denial of Service in libceph OSD client due to unreset sparse-read state (CVE-2026-23136)
• kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204)
• kernel: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or privilege escalation (CVE-2026-23270)
• kernel: Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling (CVE-2026-23401)
• kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402)
• kernel: can: raw: fix ro->uniq use-after-free in raw_rcv() (CVE-2026-31532)
• kernel: usbip: validate number_of_packets in usbip_pack_ret_submit() (CVE-2026-31607)
• kernel: md/bitmap: fix GPF in write_page caused by resize race (CVE-2026-43163)
• kernel: RDMA/umem: Fix double dma_buf_unpin in failure path (CVE-2026-43128)
• kernel: "Dirty Frag" is a new universal Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-43284)
• kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300)
• kernel: Read root-owned files as an unprivileged user (CVE-2026-46333)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: net: af_can: do not leave a dangling sk pointer in can_create() (CVE-2024-56603)
• kernel: net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit (CVE-2025-39766)
• kernel: crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id (CVE-2025-68724)
• kernel: scsi: qla2xxx: Fix improper freeing of purex item (CVE-2025-68741)
• kernel: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or privilege escalation (CVE-2026-23270)
• kernel: Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling (CVE-2026-23401)
• kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402)
• kernel: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold (CVE-2026-31408)
• kernel: usbip: validate number_of_packets in usbip_pack_ret_submit() (CVE-2026-31607)
• kernel: RDMA/umem: Fix double dma_buf_unpin in failure path (CVE-2026-43128)
• kernel: "Dirty Frag" is a new universal Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-43284)
• kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300)
• kernel: Read root-owned files as an unprivileged user (CVE-2026-46333)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300)
• kernel: Read root-owned files as an unprivileged user (CVE-2026-46333)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300)
• kernel: Read root-owned files as an unprivileged user (CVE-2026-46333)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: net: skbuff: propagate shared-frag marker through frag-transfer helpers (CVE-2026-46300)
• kernel: ptrace: require CAP_SYS_PTRACE when task has no mm (CVE-2026-46333)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: net: skbuff: propagate shared-frag marker through frag-transfer helpers (CVE-2026-46300)
• kernel: ptrace: require CAP_SYS_PTRACE when task has no mm (CVE-2026-46333)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: net: skbuff: propagate shared-frag marker through frag-transfer helpers (CVE-2026-46300)
• kernel: ptrace: require CAP_SYS_PTRACE when task has no mm (CVE-2026-46333)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

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

net: skbuff: preserve shared-frag marker during coalescing

skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost.

That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags.

Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.

• net: skbuff: propagate shared-frag marker through pskb_copy()

• net: skbuff: propagate shared-frag marker through pskb_copy()

• net: skbuff: propagate shared-frag marker (8.x backport) {CVE-2026-46300}

• net: skbuff: propagate shared-frag marker (8.x backport) {CVE-2026-46300}

• net: skbuff: propagate shared-frag marker (8.x backport) {CVE-2026-46300}

• net: skbuff: propagate shared-frag marker through skb_gro_receive + skb_shift {CVE-2026-46300}

• net: skbuff: propagate shared-frag marker through skb_gro_receive + skb_shift {CVE-2026-46300}
• Revert "net: gro: propagate SKBFL_SHARED_FRAG through skb_gro_receive"

• ptrace: require CAP_SYS_PTRACE when task has no mm
• net: udp_offload: propagate SKBFL_SHARED_FRAG in skb_gro_receive_list {CVE-2026-46300}
• can: raw: fix ro->uniq use-after-free in raw_rcv() {CVE-2026-31532}

• ptrace: require CAP_SYS_PTRACE when task has no mm
• net: udp_offload: propagate SKBFL_SHARED_FRAG in skb_gro_receive_list {CVE-2026-46300}