{"id":"CVE-2026-45998","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix potential UAF after skb_unshare() failure\n\nIf skb_unshare() fails to unshare a packet due to allocation failure in\nrxrpc_input_packet(), the skb pointer in t…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix potential UAF after skb_unshare() failure\n\nIf skb_unshare() fails to unshare a packet due to allocation failure in\nrxrpc_input_packet(), the skb pointer in t…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416","CWE-825"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 6.2, < 6.6.140","linux_kernel >= 6.7, < 6.12.86","linux_kernel >= 6.13, < 6.18.27","linux_kernel >= 6.19, < 7.0.4"],"patched":["linux_kernel 7.0.4"],"published":"2026-05-27","updated":"2026-09-16","sourceUpdated":"2026-09-16T13:17:59.330","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-45998","references":[{"url":"https://git.kernel.org/stable/c/1f2740150f904bfa60e4bad74d65add3ccb5e7f8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8fde6296c4d4da2be7ab761305ab7f232b94eefd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/996b0487b3cdda4c91811dbb1c9564626bc840bd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/bf20f46d94f1db38e6ffc0ca204a5fe0de01b495","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e3bf143b1e98fb3d6d9e6825bcd683974d478e8c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://access.redhat.com/errata/RHSA-2026:34911","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:55445","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:65708","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:65712","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:67721","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:67723","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-45998","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2482024","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45998.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-45998"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45998"},{"url":"https://lore.kernel.org/linux-cve-announce/2026052741-CVE-2026-45998-6b5d@gregkh/T"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00137,"epssPercentile":0.03485,"scores":{"nvd":7.8,"adp":7,"vendor":7},"ingestedAt":"2026-07-03T14:03:37.069Z","slug":"CVE-2026-45998","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix potential UAF after skb_unshare() failure\n\nIf skb_unshare() fails to unshare a packet due to allocation failure in\nrxrpc_input_packet(), the skb pointer in the parent (rxrpc_io_thread())\nwill be NULL'd out.  This will likely cause the call to\ntrace_rxrpc_rx_done() to oops.\n\nFix this by moving the unsharing down to where rxrpc_input_call_event()\ncalls rxrpc_input_call_packet().  There are a number of places prior to\nthat where we ignore DATA packets for a variety of reasons (such as the\ncall already being complete) for which an unshare is then avoided.\n\nAnd with that, rxrpc_input_packet() doesn't need to take a pointer to the\npointer to the packet, so change that to just a pointer.\n\n## Affected\n\n- `linux_kernel >= 6.2, < 6.6.140`\n- `linux_kernel >= 6.7, < 6.12.86`\n- `linux_kernel >= 6.13, < 6.18.27`\n- `linux_kernel >= 6.19, < 7.0.4`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.0.4`\n\n## Vendor advisories\n\n- **RHSA-2026:55445** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0) · released 2026-08-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:55445)\n- **RHSA-2026:34911** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-07-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:34911)\n- **RHSA-2026:65712** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4), Red Hat Enterprise Linux Real Time E4S (v.9.4) · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:65712)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45998.json)\n- **RHSA-2026:65708** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6), Red Hat Enterprise Linux Real Time EUS (v.9.6) · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:65708)\n- **RHSA-2026:67723** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2) · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:67723)\n- **RHSA-2026:67721** · Red Hat · fixed in: Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2), Red Hat Enterprise Linux Real Time E4S (v.9.2) · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:67721)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}